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Posted to commits@hbase.apache.org by sy...@apache.org on 2016/07/23 23:03:45 UTC

[1/3] hbase git commit: HBASE-16008 A robust way deal with early termination of HBCK (Stephen Yuan Jiang)

Repository: hbase
Updated Branches:
  refs/heads/master cd0b85e0a -> bdd7782f0


http://git-wip-us.apache.org/repos/asf/hbase/blob/bdd7782f/hbase-protocol/src/main/protobuf/Master.proto
----------------------------------------------------------------------
diff --git a/hbase-protocol/src/main/protobuf/Master.proto b/hbase-protocol/src/main/protobuf/Master.proto
index 2bf36b4..f67b7c7 100644
--- a/hbase-protocol/src/main/protobuf/Master.proto
+++ b/hbase-protocol/src/main/protobuf/Master.proto
@@ -258,6 +258,13 @@ message StopMasterRequest {
 message StopMasterResponse {
 }
 
+message IsInMaintenanceModeRequest {
+}
+
+message IsInMaintenanceModeResponse {
+  required bool inMaintenanceMode = 1;
+}
+
 message BalanceRequest {
   optional bool force = 1;
 }
@@ -641,6 +648,12 @@ service MasterService {
     returns(StopMasterResponse);
 
   /**
+   * Query whether the Master is in maintenance mode.
+   */
+  rpc IsMasterInMaintenanceMode(IsInMaintenanceModeRequest)
+    returns(IsInMaintenanceModeResponse);
+
+  /**
    * Run the balancer.  Will run the balancer and if regions to move, it will
    * go ahead and do the reassignments.  Can NOT run for various reasons.
    * Check logs.

http://git-wip-us.apache.org/repos/asf/hbase/blob/bdd7782f/hbase-server/src/main/java/org/apache/hadoop/hbase/master/CatalogJanitor.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/CatalogJanitor.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/CatalogJanitor.java
index c93b307..476c796 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/CatalogJanitor.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/CatalogJanitor.java
@@ -109,6 +109,7 @@ public class CatalogJanitor extends ScheduledChore {
     try {
       AssignmentManager am = this.services.getAssignmentManager();
       if (this.enabled.get()
+          && !this.services.isInMaintenanceMode()
           && am != null
           && am.isFailoverCleanupDone()
           && am.getRegionStates().getRegionsInTransition().size() == 0) {
@@ -241,6 +242,11 @@ public class CatalogJanitor extends ScheduledChore {
       int mergeCleaned = 0;
       Map<HRegionInfo, Result> mergedRegions = scanTriple.getSecond();
       for (Map.Entry<HRegionInfo, Result> e : mergedRegions.entrySet()) {
+        if (this.services.isInMaintenanceMode()) {
+          // Stop cleaning if the master is in maintenance mode
+          break;
+        }
+
         PairOfSameType<HRegionInfo> p = MetaTableAccessor.getMergeRegions(e.getValue());
         HRegionInfo regionA = p.getFirst();
         HRegionInfo regionB = p.getSecond();
@@ -266,6 +272,11 @@ public class CatalogJanitor extends ScheduledChore {
       // regions whose parents are still around
       HashSet<String> parentNotCleaned = new HashSet<String>();
       for (Map.Entry<HRegionInfo, Result> e : splitParents.entrySet()) {
+        if (this.services.isInMaintenanceMode()) {
+          // Stop cleaning if the master is in maintenance mode
+          break;
+        }
+
         if (!parentNotCleaned.contains(e.getKey().getEncodedName()) &&
             cleanParent(e.getKey(), e.getValue())) {
           splitCleaned++;

http://git-wip-us.apache.org/repos/asf/hbase/blob/bdd7782f/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
index 9196368..5f5cc38 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
@@ -159,6 +159,8 @@ import org.apache.hadoop.hbase.util.ZKDataMigrator;
 import org.apache.hadoop.hbase.zookeeper.DrainingServerTracker;
 import org.apache.hadoop.hbase.zookeeper.LoadBalancerTracker;
 import org.apache.hadoop.hbase.zookeeper.MasterAddressTracker;
+import org.apache.hadoop.hbase.zookeeper.MasterMaintenanceModeTracker;
+import org.apache.hadoop.hbase.zookeeper.MetaTableLocator;
 import org.apache.hadoop.hbase.zookeeper.RegionNormalizerTracker;
 import org.apache.hadoop.hbase.zookeeper.RegionServerTracker;
 import org.apache.hadoop.hbase.zookeeper.SplitOrMergeTracker;
@@ -261,6 +263,9 @@ public class HMaster extends HRegionServer implements MasterServices {
   // Tracker for region normalizer state
   private RegionNormalizerTracker regionNormalizerTracker;
 
+  //Tracker for master maintenance mode setting
+  private MasterMaintenanceModeTracker maintenanceModeTracker;
+
   private ClusterSchemaService clusterSchemaService;
 
   // Metrics for the HMaster
@@ -616,6 +621,9 @@ public class HMaster extends HRegionServer implements MasterServices {
     this.drainingServerTracker = new DrainingServerTracker(zooKeeper, this, this.serverManager);
     this.drainingServerTracker.start();
 
+    this.maintenanceModeTracker = new MasterMaintenanceModeTracker(zooKeeper);
+    this.maintenanceModeTracker.start();
+
     // Set the cluster as up.  If new RSs, they'll be waiting on this before
     // going ahead with their startup.
     boolean wasUp = this.clusterStatusTracker.isClusterUp();
@@ -1125,6 +1133,12 @@ public class HMaster extends HRegionServer implements MasterServices {
       LOG.debug("Master has not been initialized, don't run balancer.");
       return false;
     }
+
+    if (isInMaintenanceMode()) {
+      LOG.info("Master is in maintenanceMode mode, don't run balancer.");
+      return false;
+    }
+
     // Do this call outside of synchronized block.
     int maximumBalanceTime = getBalancerCutoffTime();
     synchronized (this.balancer) {
@@ -1228,6 +1242,11 @@ public class HMaster extends HRegionServer implements MasterServices {
       return false;
     }
 
+    if (isInMaintenanceMode()) {
+      LOG.info("Master is in maintenance mode, don't run region normalizer.");
+      return false;
+    }
+
     if (!this.regionNormalizerTracker.isNormalizerOn()) {
       LOG.debug("Region normalization is disabled, don't run region normalizer.");
       return false;
@@ -1241,6 +1260,11 @@ public class HMaster extends HRegionServer implements MasterServices {
       Collections.shuffle(allEnabledTables);
 
       for (TableName table : allEnabledTables) {
+        if (isInMaintenanceMode()) {
+          LOG.debug("Master is in maintenance mode, stop running region normalizer.");
+          return false;
+        }
+
         HTableDescriptor tblDesc = getTableDescriptors().get(table);
         if (table.isSystemTable() || (tblDesc != null &&
             !tblDesc.isNormalizationEnabled())) {
@@ -2264,6 +2288,16 @@ public class HMaster extends HRegionServer implements MasterServices {
     return initialized.isReady();
   }
 
+  /**
+   * Report whether this master is in maintenance mode.
+   *
+   * @return true if master is in maintenanceMode
+   */
+  @Override
+  public boolean isInMaintenanceMode() {
+    return maintenanceModeTracker.isInMaintenanceMode();
+  }
+
   @VisibleForTesting
   public void setInitialized(boolean isInitialized) {
     procedureExecutor.getEnvironment().setEventReady(initialized, isInitialized);
@@ -2735,7 +2769,9 @@ public class HMaster extends HRegionServer implements MasterServices {
    * @return The state of the load balancer, or false if the load balancer isn't defined.
    */
   public boolean isBalancerOn() {
-    if (null == loadBalancerTracker) return false;
+    if (null == loadBalancerTracker || isInMaintenanceMode()) {
+      return false;
+    }
     return loadBalancerTracker.isBalancerOn();
   }
 
@@ -2744,10 +2780,10 @@ public class HMaster extends HRegionServer implements MasterServices {
    * false is returned.
    */
   public boolean isNormalizerOn() {
-    return null == regionNormalizerTracker? false: regionNormalizerTracker.isNormalizerOn();
+    return (null == regionNormalizerTracker || isInMaintenanceMode()) ?
+        false: regionNormalizerTracker.isNormalizerOn();
   }
 
-
   /**
    * Queries the state of the {@link SplitOrMergeTracker}. If it is not initialized,
    * false is returned. If switchType is illegal, false will return.
@@ -2755,7 +2791,7 @@ public class HMaster extends HRegionServer implements MasterServices {
    * @return The state of the switch
    */
   public boolean isSplitOrMergeEnabled(MasterSwitchType switchType) {
-    if (null == splitOrMergeTracker) {
+    if (null == splitOrMergeTracker || isInMaintenanceMode()) {
       return false;
     }
     return splitOrMergeTracker.isSplitOrMergeEnabled(switchType);

http://git-wip-us.apache.org/repos/asf/hbase/blob/bdd7782f/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java
index 90af7c7..8974945 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java
@@ -1246,6 +1246,15 @@ public class MasterRpcServices extends RSRpcServices
   }
 
   @Override
+  public IsInMaintenanceModeResponse isMasterInMaintenanceMode(
+      final RpcController controller,
+      final IsInMaintenanceModeRequest request) throws ServiceException {
+    IsInMaintenanceModeResponse.Builder response = IsInMaintenanceModeResponse.newBuilder();
+    response.setInMaintenanceMode(master.isInMaintenanceMode());
+    return response.build();
+  }
+
+  @Override
   public UnassignRegionResponse unassignRegion(RpcController controller,
       UnassignRegionRequest req) throws ServiceException {
     try {

http://git-wip-us.apache.org/repos/asf/hbase/blob/bdd7782f/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterServices.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterServices.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterServices.java
index 9b91572..cfb2023 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterServices.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterServices.java
@@ -310,6 +310,11 @@ public interface MasterServices extends Server {
   boolean isInitialized();
 
   /**
+   * @return true if master is in maintanceMode
+   */
+  boolean isInMaintenanceMode();
+
+  /**
    * Abort a procedure.
    * @param procId ID of the procedure
    * @param mayInterruptIfRunning if the proc completed at least one step, should it be aborted?

http://git-wip-us.apache.org/repos/asf/hbase/blob/bdd7782f/hbase-server/src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java
index c05973b..d483c71 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java
@@ -104,7 +104,6 @@ import org.apache.hadoop.hbase.client.Connection;
 import org.apache.hadoop.hbase.client.ConnectionFactory;
 import org.apache.hadoop.hbase.client.Delete;
 import org.apache.hadoop.hbase.client.Get;
-import org.apache.hadoop.hbase.client.MasterSwitchType;
 import org.apache.hadoop.hbase.client.Put;
 import org.apache.hadoop.hbase.client.RegionReplicaUtil;
 import org.apache.hadoop.hbase.client.Result;
@@ -209,6 +208,9 @@ public class HBaseFsck extends Configured implements Closeable {
   // AlreadyBeingCreatedException which is implies timeout on this operations up to
   // HdfsConstants.LEASE_SOFTLIMIT_PERIOD (60 seconds).
   private static final int DEFAULT_WAIT_FOR_LOCK_TIMEOUT = 80; // seconds
+  private static final int DEFAULT_MAX_CREATE_ZNODE_ATTEMPTS = 5;
+  private static final int DEFAULT_CREATE_ZNODE_ATTEMPT_SLEEP_INTERVAL = 200; // milliseconds
+  private static final int DEFAULT_CREATE_ZNODE_ATTEMPT_MAX_SLEEP_TIME = 5000; // milliseconds
 
   /**********************
    * Internal resources
@@ -236,8 +238,6 @@ public class HBaseFsck extends Configured implements Closeable {
   private static boolean details = false; // do we display the full report
   private long timelag = DEFAULT_TIME_LAG; // tables whose modtime is older
   private static boolean forceExclusive = false; // only this hbck can modify HBase
-  private static boolean disableBalancer = false; // disable load balancer to keep regions stable
-  private static boolean disableSplitAndMerge = false; // disable split and merge
   private boolean fixAssignments = false; // fix assignment errors?
   private boolean fixMeta = false; // fix meta errors?
   private boolean checkHdfs = true; // load and check fs consistency?
@@ -306,10 +306,13 @@ public class HBaseFsck extends Configured implements Closeable {
   private Map<TableName, TableState> tableStates =
       new HashMap<TableName, TableState>();
   private final RetryCounterFactory lockFileRetryCounterFactory;
+  private final RetryCounterFactory createZNodeRetryCounterFactory;
 
   private Map<TableName, Set<String>> skippedRegions = new HashMap<TableName, Set<String>>();
 
-  ZooKeeperWatcher zkw = null;
+  private ZooKeeperWatcher zkw = null;
+  private String hbckEphemeralNodePath = null;
+  private boolean hbckZodeCreated = false;
 
   /**
    * Constructor
@@ -349,6 +352,14 @@ public class HBaseFsck extends Configured implements Closeable {
         "hbase.hbck.lockfile.attempt.sleep.interval", DEFAULT_LOCK_FILE_ATTEMPT_SLEEP_INTERVAL),
       getConf().getInt(
         "hbase.hbck.lockfile.attempt.maxsleeptime", DEFAULT_LOCK_FILE_ATTEMPT_MAX_SLEEP_TIME));
+    createZNodeRetryCounterFactory = new RetryCounterFactory(
+      getConf().getInt("hbase.hbck.createznode.attempts", DEFAULT_MAX_CREATE_ZNODE_ATTEMPTS),
+      getConf().getInt(
+        "hbase.hbck.createznode.attempt.sleep.interval",
+        DEFAULT_CREATE_ZNODE_ATTEMPT_SLEEP_INTERVAL),
+      getConf().getInt(
+        "hbase.hbck.createznode.attempt.maxsleeptime",
+        DEFAULT_CREATE_ZNODE_ATTEMPT_MAX_SLEEP_TIME));
     zkw = createZooKeeperWatcher();
   }
 
@@ -498,6 +509,7 @@ public class HBaseFsck extends Configured implements Closeable {
       @Override
       public void run() {
         IOUtils.closeQuietly(HBaseFsck.this);
+        cleanupHbckZnode();
         unlockHbck();
       }
     });
@@ -677,48 +689,77 @@ public class HBaseFsck extends Configured implements Closeable {
   }
 
   /**
+   * This method maintains an ephemeral znode. If the creation fails we return false or throw
+   * exception
+   *
+   * @return true if creating znode succeeds; false otherwise
+   * @throws IOException if IO failure occurs
+   */
+  private boolean setMasterInMaintenanceMode() throws IOException {
+    RetryCounter retryCounter = createZNodeRetryCounterFactory.create();
+    hbckEphemeralNodePath = ZKUtil.joinZNode(
+      ZooKeeperWatcher.masterMaintZNode,
+      "hbck-" + Long.toString(EnvironmentEdgeManager.currentTime()));
+    do {
+      try {
+        hbckZodeCreated = ZKUtil.createEphemeralNodeAndWatch(zkw, hbckEphemeralNodePath, null);
+        if (hbckZodeCreated) {
+          break;
+        }
+      } catch (KeeperException e) {
+        if (retryCounter.getAttemptTimes() >= retryCounter.getMaxAttempts()) {
+           throw new IOException("Can't create znode " + hbckEphemeralNodePath, e);
+        }
+        // fall through and retry
+      }
+
+      LOG.warn("Fail to create znode " + hbckEphemeralNodePath + ", try=" +
+          (retryCounter.getAttemptTimes() + 1) + " of " + retryCounter.getMaxAttempts());
+
+      try {
+        retryCounter.sleepUntilNextRetry();
+      } catch (InterruptedException ie) {
+        throw (InterruptedIOException) new InterruptedIOException(
+              "Can't create znode " + hbckEphemeralNodePath).initCause(ie);
+      }
+    } while (retryCounter.shouldRetry());
+    return hbckZodeCreated;
+  }
+
+  private void cleanupHbckZnode() {
+    try {
+      if (zkw != null && hbckZodeCreated) {
+        ZKUtil.deleteNode(zkw, hbckEphemeralNodePath);
+        hbckZodeCreated = false;
+      }
+    } catch (KeeperException e) {
+      // Ignore
+      if (!e.code().equals(KeeperException.Code.NONODE)) {
+        LOG.warn("Delete HBCK znode " + hbckEphemeralNodePath + " failed ", e);
+      }
+    }
+  }
+
+  /**
    * Contacts the master and prints out cluster-wide information
    * @return 0 on success, non-zero on failure
    */
-  public int onlineHbck() throws IOException, KeeperException, InterruptedException, ServiceException {
+  public int onlineHbck()
+      throws IOException, KeeperException, InterruptedException, ServiceException {
     // print hbase server version
     errors.print("Version: " + status.getHBaseVersion());
     offlineHdfsIntegrityRepair();
 
-    boolean oldBalancer = false;
-    if (shouldDisableBalancer()) {
-      oldBalancer = admin.setBalancerRunning(false, true);
-    }
-    boolean[] oldSplitAndMerge = null;
-    if (shouldDisableSplitAndMerge()) {
-      oldSplitAndMerge = admin.setSplitOrMergeEnabled(false, false,
-        MasterSwitchType.SPLIT, MasterSwitchType.MERGE);
+    // If Master runs maintenance tasks (such as balancer, catalog janitor, etc) during online
+    // hbck, it is likely that hbck would be misled and report transient errors.  Therefore, it
+    // is better to set Master into maintenance mode during online hbck.
+    //
+    if (!setMasterInMaintenanceMode()) {
+      LOG.warn("HBCK is running while master is not in maintenance mode, you might see transient "
+        + "error.  Please run HBCK multiple times to reduce the chance of transient error.");
     }
 
-    try {
-      onlineConsistencyRepair();
-    }
-    finally {
-      // Only restore the balancer if it was true when we started repairing and
-      // we actually disabled it. Otherwise, we might clobber another run of
-      // hbck that has just restored it.
-      if (shouldDisableBalancer() && oldBalancer) {
-        admin.setBalancerRunning(oldBalancer, false);
-      }
-
-      if (shouldDisableSplitAndMerge()) {
-        if (oldSplitAndMerge != null) {
-          if (oldSplitAndMerge[0] && oldSplitAndMerge[1]) {
-            admin.setSplitOrMergeEnabled(true, false,
-              MasterSwitchType.SPLIT, MasterSwitchType.MERGE);
-          } else if (oldSplitAndMerge[0]) {
-            admin.setSplitOrMergeEnabled(true, false, MasterSwitchType.SPLIT);
-          } else if (oldSplitAndMerge[1]) {
-            admin.setSplitOrMergeEnabled(true, false, MasterSwitchType.MERGE);
-          }
-        }
-      }
-    }
+    onlineConsistencyRepair();
 
     if (checkRegionBoundaries) {
       checkRegionBoundaries();
@@ -730,6 +771,9 @@ public class HBaseFsck extends Configured implements Closeable {
 
     checkAndFixReplication();
 
+    // Remove the hbck znode
+    cleanupHbckZnode();
+
     // Remove the hbck lock
     unlockHbck();
 
@@ -750,6 +794,7 @@ public class HBaseFsck extends Configured implements Closeable {
   @Override
   public void close() throws IOException {
     try {
+      cleanupHbckZnode();
       unlockHbck();
     } catch (Exception io) {
       LOG.warn(io);
@@ -4222,38 +4267,6 @@ public class HBaseFsck extends Configured implements Closeable {
   }
 
   /**
-   * Disable the load balancer.
-   */
-  public static void setDisableBalancer() {
-    disableBalancer = true;
-  }
-
-  /**
-   * Disable the split and merge
-   */
-  public static void setDisableSplitAndMerge() {
-    disableSplitAndMerge = true;
-  }
-
-  /**
-   * The balancer should be disabled if we are modifying HBase.
-   * It can be disabled if you want to prevent region movement from causing
-   * false positives.
-   */
-  public boolean shouldDisableBalancer() {
-    return fixAny || disableBalancer;
-  }
-
-  /**
-   * The split and merge should be disabled if we are modifying HBase.
-   * It can be disabled if you want to prevent region movement from causing
-   * false positives.
-   */
-  public boolean shouldDisableSplitAndMerge() {
-    return fixAny || disableSplitAndMerge;
-  }
-
-  /**
    * Set summary mode.
    * Print only summary of the tables and status (OK or INCONSISTENT)
    */
@@ -4514,7 +4527,6 @@ public class HBaseFsck extends Configured implements Closeable {
     out.println("   -sidelineDir <hdfs://> HDFS path to backup existing meta.");
     out.println("   -boundaries Verify that regions boundaries are the same between META and store files.");
     out.println("   -exclusive Abort if another hbck is exclusive or fixing.");
-    out.println("   -disableBalancer Disable the load balancer.");
 
     out.println("");
     out.println("  Metadata Repair options: (expert features, use with caution!)");
@@ -4610,10 +4622,6 @@ public class HBaseFsck extends Configured implements Closeable {
         setDisplayFullReport();
       } else if (cmd.equals("-exclusive")) {
         setForceExclusive();
-      } else if (cmd.equals("-disableBalancer")) {
-        setDisableBalancer();
-      }  else if (cmd.equals("-disableSplitAndMerge")) {
-        setDisableSplitAndMerge();
       } else if (cmd.equals("-timelag")) {
         if (i == args.length - 1) {
           errors.reportError(ERROR_CODE.WRONG_USAGE, "HBaseFsck: -timelag needs a value.");

http://git-wip-us.apache.org/repos/asf/hbase/blob/bdd7782f/hbase-server/src/main/java/org/apache/hadoop/hbase/zookeeper/MasterMaintenanceModeTracker.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/zookeeper/MasterMaintenanceModeTracker.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/zookeeper/MasterMaintenanceModeTracker.java
new file mode 100644
index 0000000..fc0e05f
--- /dev/null
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/zookeeper/MasterMaintenanceModeTracker.java
@@ -0,0 +1,81 @@
+/**
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hbase.zookeeper;
+
+import java.util.List;
+
+import org.apache.hadoop.hbase.classification.InterfaceAudience;
+import org.apache.zookeeper.KeeperException;
+
+/**
+ * Tracks the master Maintenance Mode via ZK.
+ */
+@InterfaceAudience.Private
+public class MasterMaintenanceModeTracker extends ZooKeeperListener {
+  private boolean hasChildren;
+
+  public MasterMaintenanceModeTracker(ZooKeeperWatcher watcher) {
+    super(watcher);
+    hasChildren = false;
+  }
+
+  public boolean isInMaintenanceMode() {
+    return hasChildren;
+  }
+
+  private void update(String path) {
+    if (path.startsWith(ZooKeeperWatcher.masterMaintZNode)) {
+      update();
+    }
+  }
+
+  private void update() {
+    try {
+      List<String> children =
+          ZKUtil.listChildrenAndWatchForNewChildren(watcher, ZooKeeperWatcher.masterMaintZNode);
+      hasChildren = (children != null && children.size() > 0);
+    } catch (KeeperException e) {
+      // Ignore the ZK keeper exception
+      hasChildren = false;
+    }
+  }
+
+  /**
+   * Starts the tracking of whether master is in Maintenance Mode.
+   */
+  public void start() {
+    watcher.registerListener(this);
+    update();
+  }
+
+  @Override
+  public void nodeCreated(String path) {
+    update(path);
+  }
+
+  @Override
+  public void nodeDeleted(String path) {
+    update(path);
+  }
+
+  @Override
+  public void nodeChildrenChanged(String path) {
+    update(path);
+  }
+}

http://git-wip-us.apache.org/repos/asf/hbase/blob/bdd7782f/hbase-server/src/main/java/org/apache/hadoop/hbase/zookeeper/SplitOrMergeTracker.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/zookeeper/SplitOrMergeTracker.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/zookeeper/SplitOrMergeTracker.java
index 2dad987..83ab350 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/zookeeper/SplitOrMergeTracker.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/zookeeper/SplitOrMergeTracker.java
@@ -146,6 +146,4 @@ public class SplitOrMergeTracker {
       return builder.build();
     }
   }
-
-
 }

http://git-wip-us.apache.org/repos/asf/hbase/blob/bdd7782f/hbase-server/src/test/java/org/apache/hadoop/hbase/master/MockNoopMasterServices.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/master/MockNoopMasterServices.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/master/MockNoopMasterServices.java
index c7a42d9..0a86ecb 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/master/MockNoopMasterServices.java
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/master/MockNoopMasterServices.java
@@ -307,6 +307,11 @@ public class MockNoopMasterServices implements MasterServices, Server {
   }
 
   @Override
+  public boolean isInMaintenanceMode() {
+    return false;
+  }
+
+  @Override
   public long getLastMajorCompactionTimestamp(TableName table) throws IOException {
     return 0;
   }

http://git-wip-us.apache.org/repos/asf/hbase/blob/bdd7782f/hbase-server/src/test/java/org/apache/hadoop/hbase/util/TestHBaseFsckOneRS.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/util/TestHBaseFsckOneRS.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/util/TestHBaseFsckOneRS.java
index 7f0f6db..e03a0d5 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/util/TestHBaseFsckOneRS.java
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/util/TestHBaseFsckOneRS.java
@@ -38,7 +38,6 @@ import org.apache.hadoop.hbase.client.Connection;
 import org.apache.hadoop.hbase.client.ConnectionFactory;
 import org.apache.hadoop.hbase.client.Delete;
 import org.apache.hadoop.hbase.client.Get;
-import org.apache.hadoop.hbase.client.MasterSwitchType;
 import org.apache.hadoop.hbase.client.Put;
 import org.apache.hadoop.hbase.client.RegionLocator;
 import org.apache.hadoop.hbase.client.Result;
@@ -78,7 +77,6 @@ import java.util.LinkedList;
 import java.util.List;
 import java.util.HashMap;
 import java.util.Map;
-import java.util.Set;
 import java.util.concurrent.Callable;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.ExecutorService;


[3/3] hbase git commit: HBASE-16008 A robust way deal with early termination of HBCK (Stephen Yuan Jiang)

Posted by sy...@apache.org.
HBASE-16008 A robust way deal with early termination of HBCK (Stephen Yuan Jiang)


Project: http://git-wip-us.apache.org/repos/asf/hbase/repo
Commit: http://git-wip-us.apache.org/repos/asf/hbase/commit/bdd7782f
Tree: http://git-wip-us.apache.org/repos/asf/hbase/tree/bdd7782f
Diff: http://git-wip-us.apache.org/repos/asf/hbase/diff/bdd7782f

Branch: refs/heads/master
Commit: bdd7782f054a4740bb63f4d9781ffe083d51e4bf
Parents: cd0b85e
Author: Stephen Yuan Jiang <sy...@gmail.com>
Authored: Sat Jul 23 14:47:11 2016 -0700
Committer: Stephen Yuan Jiang <sy...@gmail.com>
Committed: Sat Jul 23 14:47:11 2016 -0700

----------------------------------------------------------------------
 .../org/apache/hadoop/hbase/client/Admin.java   |    7 +
 .../hbase/client/ConnectionImplementation.java  |    7 +
 .../apache/hadoop/hbase/client/HBaseAdmin.java  |   15 +
 .../hbase/zookeeper/ZooKeeperWatcher.java       |    5 +
 .../hbase/protobuf/generated/MasterProtos.java  | 2574 ++++++++++++------
 hbase-protocol/src/main/protobuf/Master.proto   |   13 +
 .../hadoop/hbase/master/CatalogJanitor.java     |   11 +
 .../org/apache/hadoop/hbase/master/HMaster.java |   44 +-
 .../hadoop/hbase/master/MasterRpcServices.java  |    9 +
 .../hadoop/hbase/master/MasterServices.java     |    5 +
 .../org/apache/hadoop/hbase/util/HBaseFsck.java |  156 +-
 .../zookeeper/MasterMaintenanceModeTracker.java |   81 +
 .../hbase/zookeeper/SplitOrMergeTracker.java    |    2 -
 .../hbase/master/MockNoopMasterServices.java    |    5 +
 .../hadoop/hbase/util/TestHBaseFsckOneRS.java   |    2 -
 15 files changed, 2011 insertions(+), 925 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hbase/blob/bdd7782f/hbase-client/src/main/java/org/apache/hadoop/hbase/client/Admin.java
----------------------------------------------------------------------
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/Admin.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/Admin.java
index df79dcf..0610517 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/Admin.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/Admin.java
@@ -959,6 +959,13 @@ public interface Admin extends Abortable, Closeable {
   void stopMaster() throws IOException;
 
   /**
+   * Check whether Master is in maintenance mode
+   *
+   * @throws IOException if a remote or network exception occurs
+   */
+  boolean isMasterInMaintenanceMode()  throws IOException;
+
+  /**
    * Stop the designated regionserver
    *
    * @param hostnamePort Hostname and port delimited by a <code>:</code> as in

http://git-wip-us.apache.org/repos/asf/hbase/blob/bdd7782f/hbase-client/src/main/java/org/apache/hadoop/hbase/client/ConnectionImplementation.java
----------------------------------------------------------------------
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/ConnectionImplementation.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/ConnectionImplementation.java
index 9b913c8..bb5c996 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/ConnectionImplementation.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/ConnectionImplementation.java
@@ -1416,6 +1416,13 @@ class ConnectionImplementation implements ClusterConnection, Closeable {
       }
 
       @Override
+      public MasterProtos.IsInMaintenanceModeResponse isMasterInMaintenanceMode(
+          final RpcController controller,
+          final MasterProtos.IsInMaintenanceModeRequest request) throws ServiceException {
+        return stub.isMasterInMaintenanceMode(controller, request);
+      }
+
+      @Override
       public MasterProtos.BalanceResponse balance(RpcController controller,
           MasterProtos.BalanceRequest request) throws ServiceException {
         return stub.balance(controller, request);

http://git-wip-us.apache.org/repos/asf/hbase/blob/bdd7782f/hbase-client/src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
----------------------------------------------------------------------
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
index 074fe7f..29650ef 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
@@ -130,6 +130,8 @@ import org.apache.hadoop.hbase.protobuf.generated.MasterProtos.GetSchemaAlterSta
 import org.apache.hadoop.hbase.protobuf.generated.MasterProtos.GetTableDescriptorsRequest;
 import org.apache.hadoop.hbase.protobuf.generated.MasterProtos.GetTableDescriptorsResponse;
 import org.apache.hadoop.hbase.protobuf.generated.MasterProtos.GetTableNamesRequest;
+import org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest;
+import org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse;
 import org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsProcedureDoneRequest;
 import org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsProcedureDoneResponse;
 import org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsSnapshotDoneRequest;
@@ -1933,6 +1935,19 @@ public class HBaseAdmin implements Admin {
   }
 
   @Override
+  public boolean isMasterInMaintenanceMode() throws IOException {
+    return executeCallable(new MasterCallable<IsInMaintenanceModeResponse>(getConnection()) {
+      @Override
+      public IsInMaintenanceModeResponse call(int callTimeout) throws ServiceException {
+        PayloadCarryingRpcController controller = rpcControllerFactory.newController();
+        controller.setCallTimeout(callTimeout);
+        return master.isMasterInMaintenanceMode(
+          controller, IsInMaintenanceModeRequest.newBuilder().build());
+      }
+    }).getInMaintenanceMode();
+  }
+
+  @Override
   public ClusterStatus getClusterStatus() throws IOException {
     return executeCallable(new MasterCallable<ClusterStatus>(getConnection()) {
       @Override

http://git-wip-us.apache.org/repos/asf/hbase/blob/bdd7782f/hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZooKeeperWatcher.java
----------------------------------------------------------------------
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZooKeeperWatcher.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZooKeeperWatcher.java
index 7cbfc98..5ef7171 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZooKeeperWatcher.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZooKeeperWatcher.java
@@ -123,6 +123,8 @@ public class ZooKeeperWatcher implements Watcher, Abortable, Closeable {
   public String recoveringRegionsZNode;
   // znode containing namespace descriptors
   public static String namespaceZNode = "namespace";
+  // znode of indicating master maintenance mode
+  public static String masterMaintZNode = "masterMaintenance";
 
   public final static String META_ZNODE_PREFIX = "meta-region-server";
 
@@ -194,6 +196,7 @@ public class ZooKeeperWatcher implements Watcher, Abortable, Closeable {
       ZKUtil.createAndFailSilent(this, backupMasterAddressesZNode);
       ZKUtil.createAndFailSilent(this, tableLockZNode);
       ZKUtil.createAndFailSilent(this, recoveringRegionsZNode);
+      ZKUtil.createAndFailSilent(this, masterMaintZNode);
     } catch (KeeperException e) {
       throw new ZooKeeperConnectionException(
           prefix("Unexpected KeeperException creating base node"), e);
@@ -442,6 +445,8 @@ public class ZooKeeperWatcher implements Watcher, Abortable, Closeable {
         conf.get("zookeeper.znode.recovering.regions", "recovering-regions"));
     namespaceZNode = ZKUtil.joinZNode(baseZNode,
         conf.get("zookeeper.znode.namespace", "namespace"));
+    masterMaintZNode = ZKUtil.joinZNode(baseZNode,
+      conf.get("zookeeper.znode.masterMaintenance", "master-maintenance"));
   }
 
   /**


[2/3] hbase git commit: HBASE-16008 A robust way deal with early termination of HBCK (Stephen Yuan Jiang)

Posted by sy...@apache.org.
http://git-wip-us.apache.org/repos/asf/hbase/blob/bdd7782f/hbase-protocol/src/main/java/org/apache/hadoop/hbase/protobuf/generated/MasterProtos.java
----------------------------------------------------------------------
diff --git a/hbase-protocol/src/main/java/org/apache/hadoop/hbase/protobuf/generated/MasterProtos.java b/hbase-protocol/src/main/java/org/apache/hadoop/hbase/protobuf/generated/MasterProtos.java
index 6daf889..c6477fa 100644
--- a/hbase-protocol/src/main/java/org/apache/hadoop/hbase/protobuf/generated/MasterProtos.java
+++ b/hbase-protocol/src/main/java/org/apache/hadoop/hbase/protobuf/generated/MasterProtos.java
@@ -26500,38 +26500,28 @@ public final class MasterProtos {
     // @@protoc_insertion_point(class_scope:hbase.pb.StopMasterResponse)
   }
 
-  public interface BalanceRequestOrBuilder
+  public interface IsInMaintenanceModeRequestOrBuilder
       extends com.google.protobuf.MessageOrBuilder {
-
-    // optional bool force = 1;
-    /**
-     * <code>optional bool force = 1;</code>
-     */
-    boolean hasForce();
-    /**
-     * <code>optional bool force = 1;</code>
-     */
-    boolean getForce();
   }
   /**
-   * Protobuf type {@code hbase.pb.BalanceRequest}
+   * Protobuf type {@code hbase.pb.IsInMaintenanceModeRequest}
    */
-  public static final class BalanceRequest extends
+  public static final class IsInMaintenanceModeRequest extends
       com.google.protobuf.GeneratedMessage
-      implements BalanceRequestOrBuilder {
-    // Use BalanceRequest.newBuilder() to construct.
-    private BalanceRequest(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
+      implements IsInMaintenanceModeRequestOrBuilder {
+    // Use IsInMaintenanceModeRequest.newBuilder() to construct.
+    private IsInMaintenanceModeRequest(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
       super(builder);
       this.unknownFields = builder.getUnknownFields();
     }
-    private BalanceRequest(boolean noInit) { this.unknownFields = com.google.protobuf.UnknownFieldSet.getDefaultInstance(); }
+    private IsInMaintenanceModeRequest(boolean noInit) { this.unknownFields = com.google.protobuf.UnknownFieldSet.getDefaultInstance(); }
 
-    private static final BalanceRequest defaultInstance;
-    public static BalanceRequest getDefaultInstance() {
+    private static final IsInMaintenanceModeRequest defaultInstance;
+    public static IsInMaintenanceModeRequest getDefaultInstance() {
       return defaultInstance;
     }
 
-    public BalanceRequest getDefaultInstanceForType() {
+    public IsInMaintenanceModeRequest getDefaultInstanceForType() {
       return defaultInstance;
     }
 
@@ -26541,12 +26531,11 @@ public final class MasterProtos {
         getUnknownFields() {
       return this.unknownFields;
     }
-    private BalanceRequest(
+    private IsInMaintenanceModeRequest(
         com.google.protobuf.CodedInputStream input,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws com.google.protobuf.InvalidProtocolBufferException {
       initFields();
-      int mutable_bitField0_ = 0;
       com.google.protobuf.UnknownFieldSet.Builder unknownFields =
           com.google.protobuf.UnknownFieldSet.newBuilder();
       try {
@@ -26564,11 +26553,6 @@ public final class MasterProtos {
               }
               break;
             }
-            case 8: {
-              bitField0_ |= 0x00000001;
-              force_ = input.readBool();
-              break;
-            }
           }
         }
       } catch (com.google.protobuf.InvalidProtocolBufferException e) {
@@ -26583,50 +26567,32 @@ public final class MasterProtos {
     }
     public static final com.google.protobuf.Descriptors.Descriptor
         getDescriptor() {
-      return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceRequest_descriptor;
+      return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_IsInMaintenanceModeRequest_descriptor;
     }
 
     protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
         internalGetFieldAccessorTable() {
-      return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceRequest_fieldAccessorTable
+      return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_IsInMaintenanceModeRequest_fieldAccessorTable
           .ensureFieldAccessorsInitialized(
-              org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest.class, org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest.Builder.class);
+              org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest.class, org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest.Builder.class);
     }
 
-    public static com.google.protobuf.Parser<BalanceRequest> PARSER =
-        new com.google.protobuf.AbstractParser<BalanceRequest>() {
-      public BalanceRequest parsePartialFrom(
+    public static com.google.protobuf.Parser<IsInMaintenanceModeRequest> PARSER =
+        new com.google.protobuf.AbstractParser<IsInMaintenanceModeRequest>() {
+      public IsInMaintenanceModeRequest parsePartialFrom(
           com.google.protobuf.CodedInputStream input,
           com.google.protobuf.ExtensionRegistryLite extensionRegistry)
           throws com.google.protobuf.InvalidProtocolBufferException {
-        return new BalanceRequest(input, extensionRegistry);
+        return new IsInMaintenanceModeRequest(input, extensionRegistry);
       }
     };
 
     @java.lang.Override
-    public com.google.protobuf.Parser<BalanceRequest> getParserForType() {
+    public com.google.protobuf.Parser<IsInMaintenanceModeRequest> getParserForType() {
       return PARSER;
     }
 
-    private int bitField0_;
-    // optional bool force = 1;
-    public static final int FORCE_FIELD_NUMBER = 1;
-    private boolean force_;
-    /**
-     * <code>optional bool force = 1;</code>
-     */
-    public boolean hasForce() {
-      return ((bitField0_ & 0x00000001) == 0x00000001);
-    }
-    /**
-     * <code>optional bool force = 1;</code>
-     */
-    public boolean getForce() {
-      return force_;
-    }
-
     private void initFields() {
-      force_ = false;
     }
     private byte memoizedIsInitialized = -1;
     public final boolean isInitialized() {
@@ -26640,9 +26606,6 @@ public final class MasterProtos {
     public void writeTo(com.google.protobuf.CodedOutputStream output)
                         throws java.io.IOException {
       getSerializedSize();
-      if (((bitField0_ & 0x00000001) == 0x00000001)) {
-        output.writeBool(1, force_);
-      }
       getUnknownFields().writeTo(output);
     }
 
@@ -26652,10 +26615,6 @@ public final class MasterProtos {
       if (size != -1) return size;
 
       size = 0;
-      if (((bitField0_ & 0x00000001) == 0x00000001)) {
-        size += com.google.protobuf.CodedOutputStream
-          .computeBoolSize(1, force_);
-      }
       size += getUnknownFields().getSerializedSize();
       memoizedSerializedSize = size;
       return size;
@@ -26673,17 +26632,12 @@ public final class MasterProtos {
       if (obj == this) {
        return true;
       }
-      if (!(obj instanceof org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest)) {
+      if (!(obj instanceof org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest)) {
         return super.equals(obj);
       }
-      org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest other = (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest) obj;
+      org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest other = (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest) obj;
 
       boolean result = true;
-      result = result && (hasForce() == other.hasForce());
-      if (hasForce()) {
-        result = result && (getForce()
-            == other.getForce());
-      }
       result = result &&
           getUnknownFields().equals(other.getUnknownFields());
       return result;
@@ -26697,62 +26651,58 @@ public final class MasterProtos {
       }
       int hash = 41;
       hash = (19 * hash) + getDescriptorForType().hashCode();
-      if (hasForce()) {
-        hash = (37 * hash) + FORCE_FIELD_NUMBER;
-        hash = (53 * hash) + hashBoolean(getForce());
-      }
       hash = (29 * hash) + getUnknownFields().hashCode();
       memoizedHashCode = hash;
       return hash;
     }
 
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseFrom(
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest parseFrom(
         com.google.protobuf.ByteString data)
         throws com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data);
     }
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseFrom(
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest parseFrom(
         com.google.protobuf.ByteString data,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data, extensionRegistry);
     }
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseFrom(byte[] data)
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest parseFrom(byte[] data)
         throws com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data);
     }
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseFrom(
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest parseFrom(
         byte[] data,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data, extensionRegistry);
     }
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseFrom(java.io.InputStream input)
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest parseFrom(java.io.InputStream input)
         throws java.io.IOException {
       return PARSER.parseFrom(input);
     }
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseFrom(
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest parseFrom(
         java.io.InputStream input,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws java.io.IOException {
       return PARSER.parseFrom(input, extensionRegistry);
     }
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseDelimitedFrom(java.io.InputStream input)
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest parseDelimitedFrom(java.io.InputStream input)
         throws java.io.IOException {
       return PARSER.parseDelimitedFrom(input);
     }
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseDelimitedFrom(
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest parseDelimitedFrom(
         java.io.InputStream input,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws java.io.IOException {
       return PARSER.parseDelimitedFrom(input, extensionRegistry);
     }
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseFrom(
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest parseFrom(
         com.google.protobuf.CodedInputStream input)
         throws java.io.IOException {
       return PARSER.parseFrom(input);
     }
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseFrom(
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest parseFrom(
         com.google.protobuf.CodedInputStream input,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws java.io.IOException {
@@ -26761,7 +26711,7 @@ public final class MasterProtos {
 
     public static Builder newBuilder() { return Builder.create(); }
     public Builder newBuilderForType() { return newBuilder(); }
-    public static Builder newBuilder(org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest prototype) {
+    public static Builder newBuilder(org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest prototype) {
       return newBuilder().mergeFrom(prototype);
     }
     public Builder toBuilder() { return newBuilder(this); }
@@ -26773,24 +26723,24 @@ public final class MasterProtos {
       return builder;
     }
     /**
-     * Protobuf type {@code hbase.pb.BalanceRequest}
+     * Protobuf type {@code hbase.pb.IsInMaintenanceModeRequest}
      */
     public static final class Builder extends
         com.google.protobuf.GeneratedMessage.Builder<Builder>
-       implements org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequestOrBuilder {
+       implements org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequestOrBuilder {
       public static final com.google.protobuf.Descriptors.Descriptor
           getDescriptor() {
-        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceRequest_descriptor;
+        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_IsInMaintenanceModeRequest_descriptor;
       }
 
       protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
           internalGetFieldAccessorTable() {
-        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceRequest_fieldAccessorTable
+        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_IsInMaintenanceModeRequest_fieldAccessorTable
             .ensureFieldAccessorsInitialized(
-                org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest.class, org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest.Builder.class);
+                org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest.class, org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest.Builder.class);
       }
 
-      // Construct using org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest.newBuilder()
+      // Construct using org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest.newBuilder()
       private Builder() {
         maybeForceBuilderInitialization();
       }
@@ -26810,8 +26760,6 @@ public final class MasterProtos {
 
       public Builder clear() {
         super.clear();
-        force_ = false;
-        bitField0_ = (bitField0_ & ~0x00000001);
         return this;
       }
 
@@ -26821,48 +26769,38 @@ public final class MasterProtos {
 
       public com.google.protobuf.Descriptors.Descriptor
           getDescriptorForType() {
-        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceRequest_descriptor;
+        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_IsInMaintenanceModeRequest_descriptor;
       }
 
-      public org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest getDefaultInstanceForType() {
-        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest.getDefaultInstance();
+      public org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest getDefaultInstanceForType() {
+        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest.getDefaultInstance();
       }
 
-      public org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest build() {
-        org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest result = buildPartial();
+      public org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest build() {
+        org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest result = buildPartial();
         if (!result.isInitialized()) {
           throw newUninitializedMessageException(result);
         }
         return result;
       }
 
-      public org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest buildPartial() {
-        org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest result = new org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest(this);
-        int from_bitField0_ = bitField0_;
-        int to_bitField0_ = 0;
-        if (((from_bitField0_ & 0x00000001) == 0x00000001)) {
-          to_bitField0_ |= 0x00000001;
-        }
-        result.force_ = force_;
-        result.bitField0_ = to_bitField0_;
+      public org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest buildPartial() {
+        org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest result = new org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest(this);
         onBuilt();
         return result;
       }
 
       public Builder mergeFrom(com.google.protobuf.Message other) {
-        if (other instanceof org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest) {
-          return mergeFrom((org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest)other);
+        if (other instanceof org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest) {
+          return mergeFrom((org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest)other);
         } else {
           super.mergeFrom(other);
           return this;
         }
       }
 
-      public Builder mergeFrom(org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest other) {
-        if (other == org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest.getDefaultInstance()) return this;
-        if (other.hasForce()) {
-          setForce(other.getForce());
-        }
+      public Builder mergeFrom(org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest other) {
+        if (other == org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest.getDefaultInstance()) return this;
         this.mergeUnknownFields(other.getUnknownFields());
         return this;
       }
@@ -26875,11 +26813,11 @@ public final class MasterProtos {
           com.google.protobuf.CodedInputStream input,
           com.google.protobuf.ExtensionRegistryLite extensionRegistry)
           throws java.io.IOException {
-        org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parsedMessage = null;
+        org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest parsedMessage = null;
         try {
           parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
         } catch (com.google.protobuf.InvalidProtocolBufferException e) {
-          parsedMessage = (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest) e.getUnfinishedMessage();
+          parsedMessage = (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest) e.getUnfinishedMessage();
           throw e;
         } finally {
           if (parsedMessage != null) {
@@ -26888,84 +26826,50 @@ public final class MasterProtos {
         }
         return this;
       }
-      private int bitField0_;
 
-      // optional bool force = 1;
-      private boolean force_ ;
-      /**
-       * <code>optional bool force = 1;</code>
-       */
-      public boolean hasForce() {
-        return ((bitField0_ & 0x00000001) == 0x00000001);
-      }
-      /**
-       * <code>optional bool force = 1;</code>
-       */
-      public boolean getForce() {
-        return force_;
-      }
-      /**
-       * <code>optional bool force = 1;</code>
-       */
-      public Builder setForce(boolean value) {
-        bitField0_ |= 0x00000001;
-        force_ = value;
-        onChanged();
-        return this;
-      }
-      /**
-       * <code>optional bool force = 1;</code>
-       */
-      public Builder clearForce() {
-        bitField0_ = (bitField0_ & ~0x00000001);
-        force_ = false;
-        onChanged();
-        return this;
-      }
-
-      // @@protoc_insertion_point(builder_scope:hbase.pb.BalanceRequest)
+      // @@protoc_insertion_point(builder_scope:hbase.pb.IsInMaintenanceModeRequest)
     }
 
     static {
-      defaultInstance = new BalanceRequest(true);
+      defaultInstance = new IsInMaintenanceModeRequest(true);
       defaultInstance.initFields();
     }
 
-    // @@protoc_insertion_point(class_scope:hbase.pb.BalanceRequest)
+    // @@protoc_insertion_point(class_scope:hbase.pb.IsInMaintenanceModeRequest)
   }
 
-  public interface BalanceResponseOrBuilder
+  public interface IsInMaintenanceModeResponseOrBuilder
       extends com.google.protobuf.MessageOrBuilder {
 
-    // required bool balancer_ran = 1;
+    // required bool inMaintenanceMode = 1;
     /**
-     * <code>required bool balancer_ran = 1;</code>
+     * <code>required bool inMaintenanceMode = 1;</code>
      */
-    boolean hasBalancerRan();
+    boolean hasInMaintenanceMode();
     /**
-     * <code>required bool balancer_ran = 1;</code>
+     * <code>required bool inMaintenanceMode = 1;</code>
      */
-    boolean getBalancerRan();
+    boolean getInMaintenanceMode();
   }
   /**
-   * Protobuf type {@code hbase.pb.BalanceResponse}
+   * Protobuf type {@code hbase.pb.IsInMaintenanceModeResponse}
    */
-  public static final class BalanceResponse extends
+  public static final class IsInMaintenanceModeResponse extends
       com.google.protobuf.GeneratedMessage
-      implements BalanceResponseOrBuilder {
-    // Use BalanceResponse.newBuilder() to construct.
-    private BalanceResponse(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
+      implements IsInMaintenanceModeResponseOrBuilder {
+    // Use IsInMaintenanceModeResponse.newBuilder() to construct.
+    private IsInMaintenanceModeResponse(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
       super(builder);
       this.unknownFields = builder.getUnknownFields();
     }
-    private BalanceResponse(boolean noInit) { this.unknownFields = com.google.protobuf.UnknownFieldSet.getDefaultInstance(); }
+    private IsInMaintenanceModeResponse(boolean noInit) { this.unknownFields = com.google.protobuf.UnknownFieldSet.getDefaultInstance(); }
 
-    private static final BalanceResponse defaultInstance;
-    public static BalanceResponse getDefaultInstance() {
+    private static final IsInMaintenanceModeResponse defaultInstance;
+    public static IsInMaintenanceModeResponse getDefaultInstance() {
       return defaultInstance;
     }
 
-    public BalanceResponse getDefaultInstanceForType() {
+    public IsInMaintenanceModeResponse getDefaultInstanceForType() {
       return defaultInstance;
     }
 
@@ -26975,7 +26879,7 @@ public final class MasterProtos {
         getUnknownFields() {
       return this.unknownFields;
     }
-    private BalanceResponse(
+    private IsInMaintenanceModeResponse(
         com.google.protobuf.CodedInputStream input,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws com.google.protobuf.InvalidProtocolBufferException {
@@ -27000,7 +26904,7 @@ public final class MasterProtos {
             }
             case 8: {
               bitField0_ |= 0x00000001;
-              balancerRan_ = input.readBool();
+              inMaintenanceMode_ = input.readBool();
               break;
             }
           }
@@ -27017,57 +26921,57 @@ public final class MasterProtos {
     }
     public static final com.google.protobuf.Descriptors.Descriptor
         getDescriptor() {
-      return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceResponse_descriptor;
+      return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_IsInMaintenanceModeResponse_descriptor;
     }
 
     protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
         internalGetFieldAccessorTable() {
-      return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceResponse_fieldAccessorTable
+      return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_IsInMaintenanceModeResponse_fieldAccessorTable
           .ensureFieldAccessorsInitialized(
-              org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse.class, org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse.Builder.class);
+              org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse.class, org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse.Builder.class);
     }
 
-    public static com.google.protobuf.Parser<BalanceResponse> PARSER =
-        new com.google.protobuf.AbstractParser<BalanceResponse>() {
-      public BalanceResponse parsePartialFrom(
+    public static com.google.protobuf.Parser<IsInMaintenanceModeResponse> PARSER =
+        new com.google.protobuf.AbstractParser<IsInMaintenanceModeResponse>() {
+      public IsInMaintenanceModeResponse parsePartialFrom(
           com.google.protobuf.CodedInputStream input,
           com.google.protobuf.ExtensionRegistryLite extensionRegistry)
           throws com.google.protobuf.InvalidProtocolBufferException {
-        return new BalanceResponse(input, extensionRegistry);
+        return new IsInMaintenanceModeResponse(input, extensionRegistry);
       }
     };
 
     @java.lang.Override
-    public com.google.protobuf.Parser<BalanceResponse> getParserForType() {
+    public com.google.protobuf.Parser<IsInMaintenanceModeResponse> getParserForType() {
       return PARSER;
     }
 
     private int bitField0_;
-    // required bool balancer_ran = 1;
-    public static final int BALANCER_RAN_FIELD_NUMBER = 1;
-    private boolean balancerRan_;
+    // required bool inMaintenanceMode = 1;
+    public static final int INMAINTENANCEMODE_FIELD_NUMBER = 1;
+    private boolean inMaintenanceMode_;
     /**
-     * <code>required bool balancer_ran = 1;</code>
+     * <code>required bool inMaintenanceMode = 1;</code>
      */
-    public boolean hasBalancerRan() {
+    public boolean hasInMaintenanceMode() {
       return ((bitField0_ & 0x00000001) == 0x00000001);
     }
     /**
-     * <code>required bool balancer_ran = 1;</code>
+     * <code>required bool inMaintenanceMode = 1;</code>
      */
-    public boolean getBalancerRan() {
-      return balancerRan_;
+    public boolean getInMaintenanceMode() {
+      return inMaintenanceMode_;
     }
 
     private void initFields() {
-      balancerRan_ = false;
+      inMaintenanceMode_ = false;
     }
     private byte memoizedIsInitialized = -1;
     public final boolean isInitialized() {
       byte isInitialized = memoizedIsInitialized;
       if (isInitialized != -1) return isInitialized == 1;
 
-      if (!hasBalancerRan()) {
+      if (!hasInMaintenanceMode()) {
         memoizedIsInitialized = 0;
         return false;
       }
@@ -27079,7 +26983,7 @@ public final class MasterProtos {
                         throws java.io.IOException {
       getSerializedSize();
       if (((bitField0_ & 0x00000001) == 0x00000001)) {
-        output.writeBool(1, balancerRan_);
+        output.writeBool(1, inMaintenanceMode_);
       }
       getUnknownFields().writeTo(output);
     }
@@ -27092,7 +26996,7 @@ public final class MasterProtos {
       size = 0;
       if (((bitField0_ & 0x00000001) == 0x00000001)) {
         size += com.google.protobuf.CodedOutputStream
-          .computeBoolSize(1, balancerRan_);
+          .computeBoolSize(1, inMaintenanceMode_);
       }
       size += getUnknownFields().getSerializedSize();
       memoizedSerializedSize = size;
@@ -27111,16 +27015,16 @@ public final class MasterProtos {
       if (obj == this) {
        return true;
       }
-      if (!(obj instanceof org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse)) {
+      if (!(obj instanceof org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse)) {
         return super.equals(obj);
       }
-      org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse other = (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse) obj;
+      org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse other = (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse) obj;
 
       boolean result = true;
-      result = result && (hasBalancerRan() == other.hasBalancerRan());
-      if (hasBalancerRan()) {
-        result = result && (getBalancerRan()
-            == other.getBalancerRan());
+      result = result && (hasInMaintenanceMode() == other.hasInMaintenanceMode());
+      if (hasInMaintenanceMode()) {
+        result = result && (getInMaintenanceMode()
+            == other.getInMaintenanceMode());
       }
       result = result &&
           getUnknownFields().equals(other.getUnknownFields());
@@ -27135,62 +27039,62 @@ public final class MasterProtos {
       }
       int hash = 41;
       hash = (19 * hash) + getDescriptorForType().hashCode();
-      if (hasBalancerRan()) {
-        hash = (37 * hash) + BALANCER_RAN_FIELD_NUMBER;
-        hash = (53 * hash) + hashBoolean(getBalancerRan());
+      if (hasInMaintenanceMode()) {
+        hash = (37 * hash) + INMAINTENANCEMODE_FIELD_NUMBER;
+        hash = (53 * hash) + hashBoolean(getInMaintenanceMode());
       }
       hash = (29 * hash) + getUnknownFields().hashCode();
       memoizedHashCode = hash;
       return hash;
     }
 
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseFrom(
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse parseFrom(
         com.google.protobuf.ByteString data)
         throws com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data);
     }
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseFrom(
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse parseFrom(
         com.google.protobuf.ByteString data,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data, extensionRegistry);
     }
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseFrom(byte[] data)
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse parseFrom(byte[] data)
         throws com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data);
     }
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseFrom(
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse parseFrom(
         byte[] data,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data, extensionRegistry);
     }
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseFrom(java.io.InputStream input)
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse parseFrom(java.io.InputStream input)
         throws java.io.IOException {
       return PARSER.parseFrom(input);
     }
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseFrom(
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse parseFrom(
         java.io.InputStream input,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws java.io.IOException {
       return PARSER.parseFrom(input, extensionRegistry);
     }
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseDelimitedFrom(java.io.InputStream input)
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse parseDelimitedFrom(java.io.InputStream input)
         throws java.io.IOException {
       return PARSER.parseDelimitedFrom(input);
     }
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseDelimitedFrom(
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse parseDelimitedFrom(
         java.io.InputStream input,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws java.io.IOException {
       return PARSER.parseDelimitedFrom(input, extensionRegistry);
     }
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseFrom(
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse parseFrom(
         com.google.protobuf.CodedInputStream input)
         throws java.io.IOException {
       return PARSER.parseFrom(input);
     }
-    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseFrom(
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse parseFrom(
         com.google.protobuf.CodedInputStream input,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws java.io.IOException {
@@ -27199,7 +27103,7 @@ public final class MasterProtos {
 
     public static Builder newBuilder() { return Builder.create(); }
     public Builder newBuilderForType() { return newBuilder(); }
-    public static Builder newBuilder(org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse prototype) {
+    public static Builder newBuilder(org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse prototype) {
       return newBuilder().mergeFrom(prototype);
     }
     public Builder toBuilder() { return newBuilder(this); }
@@ -27211,24 +27115,24 @@ public final class MasterProtos {
       return builder;
     }
     /**
-     * Protobuf type {@code hbase.pb.BalanceResponse}
+     * Protobuf type {@code hbase.pb.IsInMaintenanceModeResponse}
      */
     public static final class Builder extends
         com.google.protobuf.GeneratedMessage.Builder<Builder>
-       implements org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponseOrBuilder {
+       implements org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponseOrBuilder {
       public static final com.google.protobuf.Descriptors.Descriptor
           getDescriptor() {
-        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceResponse_descriptor;
+        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_IsInMaintenanceModeResponse_descriptor;
       }
 
       protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
           internalGetFieldAccessorTable() {
-        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceResponse_fieldAccessorTable
+        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_IsInMaintenanceModeResponse_fieldAccessorTable
             .ensureFieldAccessorsInitialized(
-                org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse.class, org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse.Builder.class);
+                org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse.class, org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse.Builder.class);
       }
 
-      // Construct using org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse.newBuilder()
+      // Construct using org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse.newBuilder()
       private Builder() {
         maybeForceBuilderInitialization();
       }
@@ -27248,7 +27152,7 @@ public final class MasterProtos {
 
       public Builder clear() {
         super.clear();
-        balancerRan_ = false;
+        inMaintenanceMode_ = false;
         bitField0_ = (bitField0_ & ~0x00000001);
         return this;
       }
@@ -27259,54 +27163,54 @@ public final class MasterProtos {
 
       public com.google.protobuf.Descriptors.Descriptor
           getDescriptorForType() {
-        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceResponse_descriptor;
+        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_IsInMaintenanceModeResponse_descriptor;
       }
 
-      public org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse getDefaultInstanceForType() {
-        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse.getDefaultInstance();
+      public org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse getDefaultInstanceForType() {
+        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse.getDefaultInstance();
       }
 
-      public org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse build() {
-        org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse result = buildPartial();
+      public org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse build() {
+        org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse result = buildPartial();
         if (!result.isInitialized()) {
           throw newUninitializedMessageException(result);
         }
         return result;
       }
 
-      public org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse buildPartial() {
-        org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse result = new org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse(this);
+      public org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse buildPartial() {
+        org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse result = new org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse(this);
         int from_bitField0_ = bitField0_;
         int to_bitField0_ = 0;
         if (((from_bitField0_ & 0x00000001) == 0x00000001)) {
           to_bitField0_ |= 0x00000001;
         }
-        result.balancerRan_ = balancerRan_;
+        result.inMaintenanceMode_ = inMaintenanceMode_;
         result.bitField0_ = to_bitField0_;
         onBuilt();
         return result;
       }
 
       public Builder mergeFrom(com.google.protobuf.Message other) {
-        if (other instanceof org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse) {
-          return mergeFrom((org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse)other);
+        if (other instanceof org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse) {
+          return mergeFrom((org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse)other);
         } else {
           super.mergeFrom(other);
           return this;
         }
       }
 
-      public Builder mergeFrom(org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse other) {
-        if (other == org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse.getDefaultInstance()) return this;
-        if (other.hasBalancerRan()) {
-          setBalancerRan(other.getBalancerRan());
+      public Builder mergeFrom(org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse other) {
+        if (other == org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse.getDefaultInstance()) return this;
+        if (other.hasInMaintenanceMode()) {
+          setInMaintenanceMode(other.getInMaintenanceMode());
         }
         this.mergeUnknownFields(other.getUnknownFields());
         return this;
       }
 
       public final boolean isInitialized() {
-        if (!hasBalancerRan()) {
+        if (!hasInMaintenanceMode()) {
           
           return false;
         }
@@ -27317,11 +27221,11 @@ public final class MasterProtos {
           com.google.protobuf.CodedInputStream input,
           com.google.protobuf.ExtensionRegistryLite extensionRegistry)
           throws java.io.IOException {
-        org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parsedMessage = null;
+        org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse parsedMessage = null;
         try {
           parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
         } catch (com.google.protobuf.InvalidProtocolBufferException e) {
-          parsedMessage = (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse) e.getUnfinishedMessage();
+          parsedMessage = (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse) e.getUnfinishedMessage();
           throw e;
         } finally {
           if (parsedMessage != null) {
@@ -27332,92 +27236,82 @@ public final class MasterProtos {
       }
       private int bitField0_;
 
-      // required bool balancer_ran = 1;
-      private boolean balancerRan_ ;
+      // required bool inMaintenanceMode = 1;
+      private boolean inMaintenanceMode_ ;
       /**
-       * <code>required bool balancer_ran = 1;</code>
+       * <code>required bool inMaintenanceMode = 1;</code>
        */
-      public boolean hasBalancerRan() {
+      public boolean hasInMaintenanceMode() {
         return ((bitField0_ & 0x00000001) == 0x00000001);
       }
       /**
-       * <code>required bool balancer_ran = 1;</code>
+       * <code>required bool inMaintenanceMode = 1;</code>
        */
-      public boolean getBalancerRan() {
-        return balancerRan_;
+      public boolean getInMaintenanceMode() {
+        return inMaintenanceMode_;
       }
       /**
-       * <code>required bool balancer_ran = 1;</code>
+       * <code>required bool inMaintenanceMode = 1;</code>
        */
-      public Builder setBalancerRan(boolean value) {
+      public Builder setInMaintenanceMode(boolean value) {
         bitField0_ |= 0x00000001;
-        balancerRan_ = value;
+        inMaintenanceMode_ = value;
         onChanged();
         return this;
       }
       /**
-       * <code>required bool balancer_ran = 1;</code>
+       * <code>required bool inMaintenanceMode = 1;</code>
        */
-      public Builder clearBalancerRan() {
+      public Builder clearInMaintenanceMode() {
         bitField0_ = (bitField0_ & ~0x00000001);
-        balancerRan_ = false;
+        inMaintenanceMode_ = false;
         onChanged();
         return this;
       }
 
-      // @@protoc_insertion_point(builder_scope:hbase.pb.BalanceResponse)
+      // @@protoc_insertion_point(builder_scope:hbase.pb.IsInMaintenanceModeResponse)
     }
 
     static {
-      defaultInstance = new BalanceResponse(true);
+      defaultInstance = new IsInMaintenanceModeResponse(true);
       defaultInstance.initFields();
     }
 
-    // @@protoc_insertion_point(class_scope:hbase.pb.BalanceResponse)
+    // @@protoc_insertion_point(class_scope:hbase.pb.IsInMaintenanceModeResponse)
   }
 
-  public interface SetBalancerRunningRequestOrBuilder
+  public interface BalanceRequestOrBuilder
       extends com.google.protobuf.MessageOrBuilder {
 
-    // required bool on = 1;
-    /**
-     * <code>required bool on = 1;</code>
-     */
-    boolean hasOn();
-    /**
-     * <code>required bool on = 1;</code>
-     */
-    boolean getOn();
-
-    // optional bool synchronous = 2;
+    // optional bool force = 1;
     /**
-     * <code>optional bool synchronous = 2;</code>
+     * <code>optional bool force = 1;</code>
      */
-    boolean hasSynchronous();
+    boolean hasForce();
     /**
-     * <code>optional bool synchronous = 2;</code>
+     * <code>optional bool force = 1;</code>
      */
-    boolean getSynchronous();
+    boolean getForce();
   }
   /**
-   * Protobuf type {@code hbase.pb.SetBalancerRunningRequest}
+   * Protobuf type {@code hbase.pb.BalanceRequest}
    */
-  public static final class SetBalancerRunningRequest extends
+  public static final class BalanceRequest extends
       com.google.protobuf.GeneratedMessage
-      implements SetBalancerRunningRequestOrBuilder {
-    // Use SetBalancerRunningRequest.newBuilder() to construct.
-    private SetBalancerRunningRequest(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
+      implements BalanceRequestOrBuilder {
+    // Use BalanceRequest.newBuilder() to construct.
+    private BalanceRequest(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
       super(builder);
       this.unknownFields = builder.getUnknownFields();
     }
-    private SetBalancerRunningRequest(boolean noInit) { this.unknownFields = com.google.protobuf.UnknownFieldSet.getDefaultInstance(); }
+    private BalanceRequest(boolean noInit) { this.unknownFields = com.google.protobuf.UnknownFieldSet.getDefaultInstance(); }
 
-    private static final SetBalancerRunningRequest defaultInstance;
-    public static SetBalancerRunningRequest getDefaultInstance() {
+    private static final BalanceRequest defaultInstance;
+    public static BalanceRequest getDefaultInstance() {
       return defaultInstance;
     }
 
-    public SetBalancerRunningRequest getDefaultInstanceForType() {
+    public BalanceRequest getDefaultInstanceForType() {
       return defaultInstance;
     }
 
@@ -27427,7 +27321,893 @@ public final class MasterProtos {
         getUnknownFields() {
       return this.unknownFields;
     }
-    private SetBalancerRunningRequest(
+    private BalanceRequest(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      initFields();
+      int mutable_bitField0_ = 0;
+      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
+          com.google.protobuf.UnknownFieldSet.newBuilder();
+      try {
+        boolean done = false;
+        while (!done) {
+          int tag = input.readTag();
+          switch (tag) {
+            case 0:
+              done = true;
+              break;
+            default: {
+              if (!parseUnknownField(input, unknownFields,
+                                     extensionRegistry, tag)) {
+                done = true;
+              }
+              break;
+            }
+            case 8: {
+              bitField0_ |= 0x00000001;
+              force_ = input.readBool();
+              break;
+            }
+          }
+        }
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(this);
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(
+            e.getMessage()).setUnfinishedMessage(this);
+      } finally {
+        this.unknownFields = unknownFields.build();
+        makeExtensionsImmutable();
+      }
+    }
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceRequest_descriptor;
+    }
+
+    protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceRequest_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest.class, org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest.Builder.class);
+    }
+
+    public static com.google.protobuf.Parser<BalanceRequest> PARSER =
+        new com.google.protobuf.AbstractParser<BalanceRequest>() {
+      public BalanceRequest parsePartialFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        return new BalanceRequest(input, extensionRegistry);
+      }
+    };
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<BalanceRequest> getParserForType() {
+      return PARSER;
+    }
+
+    private int bitField0_;
+    // optional bool force = 1;
+    public static final int FORCE_FIELD_NUMBER = 1;
+    private boolean force_;
+    /**
+     * <code>optional bool force = 1;</code>
+     */
+    public boolean hasForce() {
+      return ((bitField0_ & 0x00000001) == 0x00000001);
+    }
+    /**
+     * <code>optional bool force = 1;</code>
+     */
+    public boolean getForce() {
+      return force_;
+    }
+
+    private void initFields() {
+      force_ = false;
+    }
+    private byte memoizedIsInitialized = -1;
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized != -1) return isInitialized == 1;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    public void writeTo(com.google.protobuf.CodedOutputStream output)
+                        throws java.io.IOException {
+      getSerializedSize();
+      if (((bitField0_ & 0x00000001) == 0x00000001)) {
+        output.writeBool(1, force_);
+      }
+      getUnknownFields().writeTo(output);
+    }
+
+    private int memoizedSerializedSize = -1;
+    public int getSerializedSize() {
+      int size = memoizedSerializedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      if (((bitField0_ & 0x00000001) == 0x00000001)) {
+        size += com.google.protobuf.CodedOutputStream
+          .computeBoolSize(1, force_);
+      }
+      size += getUnknownFields().getSerializedSize();
+      memoizedSerializedSize = size;
+      return size;
+    }
+
+    private static final long serialVersionUID = 0L;
+    @java.lang.Override
+    protected java.lang.Object writeReplace()
+        throws java.io.ObjectStreamException {
+      return super.writeReplace();
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+       return true;
+      }
+      if (!(obj instanceof org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest)) {
+        return super.equals(obj);
+      }
+      org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest other = (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest) obj;
+
+      boolean result = true;
+      result = result && (hasForce() == other.hasForce());
+      if (hasForce()) {
+        result = result && (getForce()
+            == other.getForce());
+      }
+      result = result &&
+          getUnknownFields().equals(other.getUnknownFields());
+      return result;
+    }
+
+    private int memoizedHashCode = 0;
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptorForType().hashCode();
+      if (hasForce()) {
+        hash = (37 * hash) + FORCE_FIELD_NUMBER;
+        hash = (53 * hash) + hashBoolean(getForce());
+      }
+      hash = (29 * hash) + getUnknownFields().hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseFrom(byte[] data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseFrom(
+        byte[] data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return PARSER.parseFrom(input);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return PARSER.parseFrom(input, extensionRegistry);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseDelimitedFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return PARSER.parseDelimitedFrom(input);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseDelimitedFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return PARSER.parseDelimitedFrom(input, extensionRegistry);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseFrom(
+        com.google.protobuf.CodedInputStream input)
+        throws java.io.IOException {
+      return PARSER.parseFrom(input);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return PARSER.parseFrom(input, extensionRegistry);
+    }
+
+    public static Builder newBuilder() { return Builder.create(); }
+    public Builder newBuilderForType() { return newBuilder(); }
+    public static Builder newBuilder(org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest prototype) {
+      return newBuilder().mergeFrom(prototype);
+    }
+    public Builder toBuilder() { return newBuilder(this); }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessage.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+    /**
+     * Protobuf type {@code hbase.pb.BalanceRequest}
+     */
+    public static final class Builder extends
+        com.google.protobuf.GeneratedMessage.Builder<Builder>
+       implements org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequestOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor
+          getDescriptor() {
+        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceRequest_descriptor;
+      }
+
+      protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceRequest_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest.class, org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest.Builder.class);
+      }
+
+      // Construct using org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest.newBuilder()
+      private Builder() {
+        maybeForceBuilderInitialization();
+      }
+
+      private Builder(
+          com.google.protobuf.GeneratedMessage.BuilderParent parent) {
+        super(parent);
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders) {
+        }
+      }
+      private static Builder create() {
+        return new Builder();
+      }
+
+      public Builder clear() {
+        super.clear();
+        force_ = false;
+        bitField0_ = (bitField0_ & ~0x00000001);
+        return this;
+      }
+
+      public Builder clone() {
+        return create().mergeFrom(buildPartial());
+      }
+
+      public com.google.protobuf.Descriptors.Descriptor
+          getDescriptorForType() {
+        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceRequest_descriptor;
+      }
+
+      public org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest getDefaultInstanceForType() {
+        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest.getDefaultInstance();
+      }
+
+      public org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest build() {
+        org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      public org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest buildPartial() {
+        org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest result = new org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest(this);
+        int from_bitField0_ = bitField0_;
+        int to_bitField0_ = 0;
+        if (((from_bitField0_ & 0x00000001) == 0x00000001)) {
+          to_bitField0_ |= 0x00000001;
+        }
+        result.force_ = force_;
+        result.bitField0_ = to_bitField0_;
+        onBuilt();
+        return result;
+      }
+
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest) {
+          return mergeFrom((org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest)other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest other) {
+        if (other == org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest.getDefaultInstance()) return this;
+        if (other.hasForce()) {
+          setForce(other.getForce());
+        }
+        this.mergeUnknownFields(other.getUnknownFields());
+        return this;
+      }
+
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest parsedMessage = null;
+        try {
+          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          parsedMessage = (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest) e.getUnfinishedMessage();
+          throw e;
+        } finally {
+          if (parsedMessage != null) {
+            mergeFrom(parsedMessage);
+          }
+        }
+        return this;
+      }
+      private int bitField0_;
+
+      // optional bool force = 1;
+      private boolean force_ ;
+      /**
+       * <code>optional bool force = 1;</code>
+       */
+      public boolean hasForce() {
+        return ((bitField0_ & 0x00000001) == 0x00000001);
+      }
+      /**
+       * <code>optional bool force = 1;</code>
+       */
+      public boolean getForce() {
+        return force_;
+      }
+      /**
+       * <code>optional bool force = 1;</code>
+       */
+      public Builder setForce(boolean value) {
+        bitField0_ |= 0x00000001;
+        force_ = value;
+        onChanged();
+        return this;
+      }
+      /**
+       * <code>optional bool force = 1;</code>
+       */
+      public Builder clearForce() {
+        bitField0_ = (bitField0_ & ~0x00000001);
+        force_ = false;
+        onChanged();
+        return this;
+      }
+
+      // @@protoc_insertion_point(builder_scope:hbase.pb.BalanceRequest)
+    }
+
+    static {
+      defaultInstance = new BalanceRequest(true);
+      defaultInstance.initFields();
+    }
+
+    // @@protoc_insertion_point(class_scope:hbase.pb.BalanceRequest)
+  }
+
+  public interface BalanceResponseOrBuilder
+      extends com.google.protobuf.MessageOrBuilder {
+
+    // required bool balancer_ran = 1;
+    /**
+     * <code>required bool balancer_ran = 1;</code>
+     */
+    boolean hasBalancerRan();
+    /**
+     * <code>required bool balancer_ran = 1;</code>
+     */
+    boolean getBalancerRan();
+  }
+  /**
+   * Protobuf type {@code hbase.pb.BalanceResponse}
+   */
+  public static final class BalanceResponse extends
+      com.google.protobuf.GeneratedMessage
+      implements BalanceResponseOrBuilder {
+    // Use BalanceResponse.newBuilder() to construct.
+    private BalanceResponse(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
+      super(builder);
+      this.unknownFields = builder.getUnknownFields();
+    }
+    private BalanceResponse(boolean noInit) { this.unknownFields = com.google.protobuf.UnknownFieldSet.getDefaultInstance(); }
+
+    private static final BalanceResponse defaultInstance;
+    public static BalanceResponse getDefaultInstance() {
+      return defaultInstance;
+    }
+
+    public BalanceResponse getDefaultInstanceForType() {
+      return defaultInstance;
+    }
+
+    private final com.google.protobuf.UnknownFieldSet unknownFields;
+    @java.lang.Override
+    public final com.google.protobuf.UnknownFieldSet
+        getUnknownFields() {
+      return this.unknownFields;
+    }
+    private BalanceResponse(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      initFields();
+      int mutable_bitField0_ = 0;
+      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
+          com.google.protobuf.UnknownFieldSet.newBuilder();
+      try {
+        boolean done = false;
+        while (!done) {
+          int tag = input.readTag();
+          switch (tag) {
+            case 0:
+              done = true;
+              break;
+            default: {
+              if (!parseUnknownField(input, unknownFields,
+                                     extensionRegistry, tag)) {
+                done = true;
+              }
+              break;
+            }
+            case 8: {
+              bitField0_ |= 0x00000001;
+              balancerRan_ = input.readBool();
+              break;
+            }
+          }
+        }
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(this);
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(
+            e.getMessage()).setUnfinishedMessage(this);
+      } finally {
+        this.unknownFields = unknownFields.build();
+        makeExtensionsImmutable();
+      }
+    }
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceResponse_descriptor;
+    }
+
+    protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceResponse_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse.class, org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse.Builder.class);
+    }
+
+    public static com.google.protobuf.Parser<BalanceResponse> PARSER =
+        new com.google.protobuf.AbstractParser<BalanceResponse>() {
+      public BalanceResponse parsePartialFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        return new BalanceResponse(input, extensionRegistry);
+      }
+    };
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<BalanceResponse> getParserForType() {
+      return PARSER;
+    }
+
+    private int bitField0_;
+    // required bool balancer_ran = 1;
+    public static final int BALANCER_RAN_FIELD_NUMBER = 1;
+    private boolean balancerRan_;
+    /**
+     * <code>required bool balancer_ran = 1;</code>
+     */
+    public boolean hasBalancerRan() {
+      return ((bitField0_ & 0x00000001) == 0x00000001);
+    }
+    /**
+     * <code>required bool balancer_ran = 1;</code>
+     */
+    public boolean getBalancerRan() {
+      return balancerRan_;
+    }
+
+    private void initFields() {
+      balancerRan_ = false;
+    }
+    private byte memoizedIsInitialized = -1;
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized != -1) return isInitialized == 1;
+
+      if (!hasBalancerRan()) {
+        memoizedIsInitialized = 0;
+        return false;
+      }
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    public void writeTo(com.google.protobuf.CodedOutputStream output)
+                        throws java.io.IOException {
+      getSerializedSize();
+      if (((bitField0_ & 0x00000001) == 0x00000001)) {
+        output.writeBool(1, balancerRan_);
+      }
+      getUnknownFields().writeTo(output);
+    }
+
+    private int memoizedSerializedSize = -1;
+    public int getSerializedSize() {
+      int size = memoizedSerializedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      if (((bitField0_ & 0x00000001) == 0x00000001)) {
+        size += com.google.protobuf.CodedOutputStream
+          .computeBoolSize(1, balancerRan_);
+      }
+      size += getUnknownFields().getSerializedSize();
+      memoizedSerializedSize = size;
+      return size;
+    }
+
+    private static final long serialVersionUID = 0L;
+    @java.lang.Override
+    protected java.lang.Object writeReplace()
+        throws java.io.ObjectStreamException {
+      return super.writeReplace();
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+       return true;
+      }
+      if (!(obj instanceof org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse)) {
+        return super.equals(obj);
+      }
+      org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse other = (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse) obj;
+
+      boolean result = true;
+      result = result && (hasBalancerRan() == other.hasBalancerRan());
+      if (hasBalancerRan()) {
+        result = result && (getBalancerRan()
+            == other.getBalancerRan());
+      }
+      result = result &&
+          getUnknownFields().equals(other.getUnknownFields());
+      return result;
+    }
+
+    private int memoizedHashCode = 0;
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptorForType().hashCode();
+      if (hasBalancerRan()) {
+        hash = (37 * hash) + BALANCER_RAN_FIELD_NUMBER;
+        hash = (53 * hash) + hashBoolean(getBalancerRan());
+      }
+      hash = (29 * hash) + getUnknownFields().hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseFrom(byte[] data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseFrom(
+        byte[] data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return PARSER.parseFrom(input);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return PARSER.parseFrom(input, extensionRegistry);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseDelimitedFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return PARSER.parseDelimitedFrom(input);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseDelimitedFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return PARSER.parseDelimitedFrom(input, extensionRegistry);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseFrom(
+        com.google.protobuf.CodedInputStream input)
+        throws java.io.IOException {
+      return PARSER.parseFrom(input);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return PARSER.parseFrom(input, extensionRegistry);
+    }
+
+    public static Builder newBuilder() { return Builder.create(); }
+    public Builder newBuilderForType() { return newBuilder(); }
+    public static Builder newBuilder(org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse prototype) {
+      return newBuilder().mergeFrom(prototype);
+    }
+    public Builder toBuilder() { return newBuilder(this); }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessage.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+    /**
+     * Protobuf type {@code hbase.pb.BalanceResponse}
+     */
+    public static final class Builder extends
+        com.google.protobuf.GeneratedMessage.Builder<Builder>
+       implements org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponseOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor
+          getDescriptor() {
+        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceResponse_descriptor;
+      }
+
+      protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceResponse_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse.class, org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse.Builder.class);
+      }
+
+      // Construct using org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse.newBuilder()
+      private Builder() {
+        maybeForceBuilderInitialization();
+      }
+
+      private Builder(
+          com.google.protobuf.GeneratedMessage.BuilderParent parent) {
+        super(parent);
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders) {
+        }
+      }
+      private static Builder create() {
+        return new Builder();
+      }
+
+      public Builder clear() {
+        super.clear();
+        balancerRan_ = false;
+        bitField0_ = (bitField0_ & ~0x00000001);
+        return this;
+      }
+
+      public Builder clone() {
+        return create().mergeFrom(buildPartial());
+      }
+
+      public com.google.protobuf.Descriptors.Descriptor
+          getDescriptorForType() {
+        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.internal_static_hbase_pb_BalanceResponse_descriptor;
+      }
+
+      public org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse getDefaultInstanceForType() {
+        return org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse.getDefaultInstance();
+      }
+
+      public org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse build() {
+        org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      public org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse buildPartial() {
+        org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse result = new org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse(this);
+        int from_bitField0_ = bitField0_;
+        int to_bitField0_ = 0;
+        if (((from_bitField0_ & 0x00000001) == 0x00000001)) {
+          to_bitField0_ |= 0x00000001;
+        }
+        result.balancerRan_ = balancerRan_;
+        result.bitField0_ = to_bitField0_;
+        onBuilt();
+        return result;
+      }
+
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse) {
+          return mergeFrom((org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse)other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse other) {
+        if (other == org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse.getDefaultInstance()) return this;
+        if (other.hasBalancerRan()) {
+          setBalancerRan(other.getBalancerRan());
+        }
+        this.mergeUnknownFields(other.getUnknownFields());
+        return this;
+      }
+
+      public final boolean isInitialized() {
+        if (!hasBalancerRan()) {
+          
+          return false;
+        }
+        return true;
+      }
+
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse parsedMessage = null;
+        try {
+          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          parsedMessage = (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceResponse) e.getUnfinishedMessage();
+          throw e;
+        } finally {
+          if (parsedMessage != null) {
+            mergeFrom(parsedMessage);
+          }
+        }
+        return this;
+      }
+      private int bitField0_;
+
+      // required bool balancer_ran = 1;
+      private boolean balancerRan_ ;
+      /**
+       * <code>required bool balancer_ran = 1;</code>
+       */
+      public boolean hasBalancerRan() {
+        return ((bitField0_ & 0x00000001) == 0x00000001);
+      }
+      /**
+       * <code>required bool balancer_ran = 1;</code>
+       */
+      public boolean getBalancerRan() {
+        return balancerRan_;
+      }
+      /**
+       * <code>required bool balancer_ran = 1;</code>
+       */
+      public Builder setBalancerRan(boolean value) {
+        bitField0_ |= 0x00000001;
+        balancerRan_ = value;
+        onChanged();
+        return this;
+      }
+      /**
+       * <code>required bool balancer_ran = 1;</code>
+       */
+      public Builder clearBalancerRan() {
+        bitField0_ = (bitField0_ & ~0x00000001);
+        balancerRan_ = false;
+        onChanged();
+        return this;
+      }
+
+      // @@protoc_insertion_point(builder_scope:hbase.pb.BalanceResponse)
+    }
+
+    static {
+      defaultInstance = new BalanceResponse(true);
+      defaultInstance.initFields();
+    }
+
+    // @@protoc_insertion_point(class_scope:hbase.pb.BalanceResponse)
+  }
+
+  public interface SetBalancerRunningRequestOrBuilder
+      extends com.google.protobuf.MessageOrBuilder {
+
+    // required bool on = 1;
+    /**
+     * <code>required bool on = 1;</code>
+     */
+    boolean hasOn();
+    /**
+     * <code>required bool on = 1;</code>
+     */
+    boolean getOn();
+
+    // optional bool synchronous = 2;
+    /**
+     * <code>optional bool synchronous = 2;</code>
+     */
+    boolean hasSynchronous();
+    /**
+     * <code>optional bool synchronous = 2;</code>
+     */
+    boolean getSynchronous();
+  }
+  /**
+   * Protobuf type {@code hbase.pb.SetBalancerRunningRequest}
+   */
+  public static final class SetBalancerRunningRequest extends
+      com.google.protobuf.GeneratedMessage
+      implements SetBalancerRunningRequestOrBuilder {
+    // Use SetBalancerRunningRequest.newBuilder() to construct.
+    private SetBalancerRunningRequest(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
+      super(builder);
+      this.unknownFields = builder.getUnknownFields();
+    }
+    private SetBalancerRunningRequest(boolean noInit) { this.unknownFields = com.google.protobuf.UnknownFieldSet.getDefaultInstance(); }
+
+    private static final SetBalancerRunningRequest defaultInstance;
+    public static SetBalancerRunningRequest getDefaultInstance() {
+      return defaultInstance;
+    }
+
+    public SetBalancerRunningRequest getDefaultInstanceForType() {
+      return defaultInstance;
+    }
+
+    private final com.google.protobuf.UnknownFieldSet unknownFields;
+    @java.lang.Override
+    public final com.google.protobuf.UnknownFieldSet
+        getUnknownFields() {
+      return this.unknownFields;
+    }
+    private SetBalancerRunningRequest(
         com.google.protobuf.CodedInputStream input,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws com.google.protobuf.InvalidProtocolBufferException {
@@ -60044,6 +60824,19 @@ public final class MasterProtos {
           com.google.protobuf.RpcCallback<org.apache.hadoop.hbase.protobuf.generated.MasterProtos.StopMasterResponse> done);
 
       /**
+       * <code>rpc IsMasterInMaintenanceMode(.hbase.pb.IsInMaintenanceModeRequest) returns (.hbase.pb.IsInMaintenanceModeResponse);</code>
+       *
+       * <pre>
+       **
+       * Query whether the Master is in maintenance mode.
+       * </pre>
+       */
+      public abstract void isMasterInMaintenanceMode(
+          com.google.protobuf.RpcController controller,
+          org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest request,
+          com.google.protobuf.RpcCallback<org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse> done);
+
+      /**
        * <code>rpc Balance(.hbase.pb.BalanceRequest) returns (.hbase.pb.BalanceResponse);</code>
        *
        * <pre>
@@ -60657,6 +61450,14 @@ public final class MasterProtos {
         }
 
         @java.lang.Override
+        public  void isMasterInMaintenanceMode(
+            com.google.protobuf.RpcController controller,
+            org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest request,
+            com.google.protobuf.RpcCallback<org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeResponse> done) {
+          impl.isMasterInMaintenanceMode(controller, request, done);
+        }
+
+        @java.lang.Override
         public  void balance(
             com.google.protobuf.RpcController controller,
             org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest request,
@@ -61001,74 +61802,76 @@ public final class MasterProtos {
             case 20:
               return impl.stopMaster(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.StopMasterRequest)request);
             case 21:
-              return impl.balance(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest)request);
+              return impl.isMasterInMaintenanceMode(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsInMaintenanceModeRequest)request);
             case 22:
-              return impl.setBalancerRunning(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.SetBalancerRunningRequest)request);
+              return impl.balance(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.BalanceRequest)request);
             case 23:
-              return impl.isBalancerEnabled(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsBalancerEnabledRequest)request);
+              return impl.setBalancerRunning(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.SetBalancerRunningRequest)request);
             case 24:
-              return impl.setSplitOrMergeEnabled(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.SetSplitOrMergeEnabledRequest)request);
+              return impl.isBalancerEnabled(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsBalancerEnabledRequest)request);
             case 25:
-              return impl.isSplitOrMergeEnabled(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsSplitOrMergeEnabledRequest)request);
+              return impl.setSplitOrMergeEnabled(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.SetSplitOrMergeEnabledRequest)request);
             case 26:
-              return impl.normalize(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.NormalizeRequest)request);
+              return impl.isSplitOrMergeEnabled(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsSplitOrMergeEnabledRequest)request);
             case 27:
-              return impl.setNormalizerRunning(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.SetNormalizerRunningRequest)request);
+              return impl.normalize(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.NormalizeRequest)request);
             case 28:
-              return impl.isNormalizerEnabled(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsNormalizerEnabledRequest)request);
+              return impl.setNormalizerRunning(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.SetNormalizerRunningRequest)request);
             case 29:
-              return impl.runCatalogScan(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.RunCatalogScanRequest)request);
+              return impl.isNormalizerEnabled(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsNormalizerEnabledRequest)request);
             case 30:
-              return impl.enableCatalogJanitor(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.EnableCatalogJanitorRequest)request);
+              return impl.runCatalogScan(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.RunCatalogScanRequest)request);
             case 31:
-              return impl.isCatalogJanitorEnabled(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsCatalogJanitorEnabledRequest)request);
+              return impl.enableCatalogJanitor(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.EnableCatalogJanitorRequest)request);
             case 32:
-              return impl.execMasterService(controller, (org.apache.hadoop.hbase.protobuf.generated.ClientProtos.CoprocessorServiceRequest)request);
+              return impl.isCatalogJanitorEnabled(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsCatalogJanitorEnabledRequest)request);
             case 33:
-              return impl.snapshot(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.SnapshotRequest)request);
+              return impl.execMasterService(controller, (org.apache.hadoop.hbase.protobuf.generated.ClientProtos.CoprocessorServiceRequest)request);
             case 34:
-              return impl.getCompletedSnapshots(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.GetCompletedSnapshotsRequest)request);
+              return impl.snapshot(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.SnapshotRequest)request);
             case 35:
-              return impl.deleteSnapshot(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.DeleteSnapshotRequest)request);
+              return impl.getCompletedSnapshots(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.GetCompletedSnapshotsRequest)request);
             case 36:
-              return impl.isSnapshotDone(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsSnapshotDoneRequest)request);
+              return impl.deleteSnapshot(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.DeleteSnapshotRequest)request);
             case 37:
-              return impl.restoreSnapshot(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.RestoreSnapshotRequest)request);
+              return impl.isSnapshotDone(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsSnapshotDoneRequest)request);
             case 38:
-              return impl.execProcedure(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.ExecProcedureRequest)request);
+              return impl.restoreSnapshot(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.RestoreSnapshotRequest)request);
             case 39:
-              return impl.execProcedureWithRet(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.ExecProcedureRequest)request);
+              return impl.execProcedure(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.ExecProcedureRequest)request);
             case 40:
-              return impl.isProcedureDone(controller, (org.apache.hadoop.hbase.protobuf.generated.MasterProtos.IsProcedureDoneRequest)request);
+              return

<TRUNCATED>