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Posted to commits@lucene.apache.org by ma...@apache.org on 2020/08/17 23:12:09 UTC

[lucene-solr] 39/49: @553 The village may think I'm crazy Or say that I drift too far But once you know what you like, well There you are

This is an automated email from the ASF dual-hosted git repository.

markrmiller pushed a commit to branch reference_impl
in repository https://gitbox.apache.org/repos/asf/lucene-solr.git

commit cab3d10c4e235de80da30500f6733bcef82f1d78
Author: markrmiller@gmail.com <ma...@gmail.com>
AuthorDate: Sun Aug 16 12:03:20 2020 -0500

    @553 The village may think I'm crazy
    Or say that I drift too far
    But once you know what you like, well
    There you are
---
 gradle/testing/defaults-tests.gradle               |   5 +-
 .../org/apache/solr/cloud/ElectionContext.java     |   2 +-
 .../java/org/apache/solr/cloud/LeaderElector.java  |  20 +-
 .../src/java/org/apache/solr/cloud/Overseer.java   |  53 ++--
 .../apache/solr/cloud/OverseerElectionContext.java |  29 +-
 .../solr/cloud/ShardLeaderElectionContext.java     |  27 +-
 .../solr/cloud/ShardLeaderElectionContextBase.java |   2 +-
 .../org/apache/solr/cloud/ZkCollectionTerms.java   |  12 +-
 .../java/org/apache/solr/cloud/ZkController.java   |  11 +-
 .../org/apache/solr/cloud/ZkDistributedQueue.java  |  12 +-
 .../java/org/apache/solr/core/CoreContainer.java   |  14 +-
 .../src/java/org/apache/solr/core/SolrCore.java    |   9 +-
 .../src/java/org/apache/solr/core/SolrCores.java   |  23 +-
 .../java/org/apache/solr/servlet/HttpSolrCall.java |   5 +-
 .../apache/solr/update/DefaultSolrCoreState.java   |  51 +--
 .../apache/solr/cloud/CollectionsAPISolrJTest.java |   2 +
 .../apache/solr/cloud/ConnectionManagerTest.java   |   1 +
 .../test/org/apache/solr/cloud/DeleteNodeTest.java |   1 +
 .../org/apache/solr/cloud/SolrCLIZkUtilsTest.java  |   2 +
 .../org/apache/solr/util/OrderedExecutorTest.java  |   8 +-
 .../src/java/org/apache/solr/common/ParWork.java   |  10 +-
 .../org/apache/solr/common/ParWorkExecService.java |  15 +-
 .../org/apache/solr/common/ParWorkExecutor.java    |  19 +-
 .../org/apache/solr/common/cloud/SolrZkClient.java |   5 +-
 .../solr/common/util/ObjectReleaseTracker.java     |   1 +
 .../src/java/org/apache/solr/CollectionTester.java | 341 +++++++++++++++++++++
 .../src/java/org/apache/solr/JSONTestUtil.java     | 314 -------------------
 27 files changed, 530 insertions(+), 464 deletions(-)

diff --git a/gradle/testing/defaults-tests.gradle b/gradle/testing/defaults-tests.gradle
index 34c583a..e5824b4 100644
--- a/gradle/testing/defaults-tests.gradle
+++ b/gradle/testing/defaults-tests.gradle
@@ -56,18 +56,17 @@ allprojects {
         testOutputsDir = file("${reports.junitXml.destination}/outputs")
       }
       binaryResultsDirectory = file(propertyOrDefault("binaryResultsDirectory", binaryResultsDirectory))
+
       if (verboseMode) {
         maxParallelForks = 1
       } else {
         maxParallelForks = propertyOrDefault("tests.jvms", (int) Math.max(1, Math.min(Runtime.runtime.availableProcessors() / 2.0, 4.0))) as Integer
       }
 
-      forkEvery = 0
-
       workingDir testsCwd
       useJUnit()
 
-      minHeapSize = propertyOrDefault("tests.minheapsize", "256m")
+      minHeapSize = propertyOrDefault("tests.minheapsize", "512m")
       maxHeapSize = propertyOrDefault("tests.heapsize", "512m")
 
       jvmArgs Commandline.translateCommandline(propertyOrDefault("tests.jvmargs", "-XX:TieredStopAtLevel=1 -XX:+UseParallelGC -XX:-UseBiasedLocking -Dorg.apache.xml.dtm.DTMManager=org.apache.xml.dtm.ref.DTMManagerDefault"));
diff --git a/solr/core/src/java/org/apache/solr/cloud/ElectionContext.java b/solr/core/src/java/org/apache/solr/cloud/ElectionContext.java
index 4e690eb..f382466 100644
--- a/solr/core/src/java/org/apache/solr/cloud/ElectionContext.java
+++ b/solr/core/src/java/org/apache/solr/cloud/ElectionContext.java
@@ -47,7 +47,7 @@ public abstract class ElectionContext implements Closeable {
     assert ObjectReleaseTracker.release(this);
   }
 
-  public void cancelElection() throws InterruptedException, KeeperException {
+  protected void cancelElection() throws InterruptedException, KeeperException {
   }
 
   abstract void runLeaderProcess(ElectionContext context, boolean weAreReplacement, int pauseBeforeStartMs) throws KeeperException, InterruptedException, IOException;
diff --git a/solr/core/src/java/org/apache/solr/cloud/LeaderElector.java b/solr/core/src/java/org/apache/solr/cloud/LeaderElector.java
index dcc5847..4fe5537 100644
--- a/solr/core/src/java/org/apache/solr/cloud/LeaderElector.java
+++ b/solr/core/src/java/org/apache/solr/cloud/LeaderElector.java
@@ -71,7 +71,7 @@ public  class LeaderElector {
   private final Map<ContextKey,ElectionContext> electionContexts;
   private final ContextKey contextKey;
 
-//  public LeaderElector(SolrZkClient zkClient) {
+  //  public LeaderElector(SolrZkClient zkClient) {
 //    this.zkClient = zkClient;
 //    this.contextKey = null;
 //    this.electionContexts = new ConcurrentHashMap<>(132, 0.75f, 50);
@@ -98,7 +98,9 @@ public  class LeaderElector {
    */
   private boolean checkIfIamLeader(final ElectionContext context, boolean replacement) throws KeeperException,
           InterruptedException, IOException {
-
+    if (context.isClosed()) {
+      throw new AlreadyClosedException();
+    }
     context.checkIfIamLeaderFired();
     boolean checkAgain = false;
     if (!getContext().isClosed()) {
@@ -163,6 +165,9 @@ public  class LeaderElector {
   // TODO: get this core param out of here
   protected void runIamLeaderProcess(final ElectionContext context, boolean weAreReplacement) throws KeeperException,
           InterruptedException, IOException {
+    if (context.isClosed()) {
+      throw new AlreadyClosedException();
+    }
     context.runLeaderProcess(context, weAreReplacement,0);
   }
 
@@ -215,7 +220,7 @@ public  class LeaderElector {
    * @return sequential node number
    */
   public int joinElection(ElectionContext context, boolean replacement,boolean joinAtHead) throws KeeperException, InterruptedException, IOException {
-    if (zkClient.isClosed()) {
+    if (context.isClosed() || zkClient.isClosed()) {
       throw new AlreadyClosedException();
     }
 
@@ -297,7 +302,9 @@ public  class LeaderElector {
       }
     }
     while(checkIfIamLeader(context, replacement)) {
-
+      if (context.isClosed()) {
+        throw new AlreadyClosedException();
+      }
     }
 
     return getSeq(context.leaderSeqPath);
@@ -347,11 +354,9 @@ public  class LeaderElector {
         // am I the next leader?
         checkIfIamLeader(context, true);
       } catch (AlreadyClosedException | InterruptedException e) {
-        ParWork.propegateInterrupt(e);
         log.info("Already shutting down");
         return;
       }  catch (Exception e) {
-        ParWork.propegateInterrupt(e);
         throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Exception canceling election", e);
       }
     }
@@ -372,6 +377,9 @@ public  class LeaderElector {
   }
 
   void retryElection(ElectionContext context, boolean joinAtHead) throws KeeperException, InterruptedException, IOException {
+    if (context.isClosed()) {
+      throw new AlreadyClosedException();
+    }
     ElectionWatcher watcher = this.watcher;
     if (electionContexts != null) {
       ElectionContext prevContext = electionContexts.put(contextKey, context);
diff --git a/solr/core/src/java/org/apache/solr/cloud/Overseer.java b/solr/core/src/java/org/apache/solr/cloud/Overseer.java
index c0d4ec2..e10695b 100644
--- a/solr/core/src/java/org/apache/solr/cloud/Overseer.java
+++ b/solr/core/src/java/org/apache/solr/cloud/Overseer.java
@@ -532,11 +532,6 @@ public class Overseer implements SolrCloseable {
     protected volatile boolean isClosed;
     private final Closeable thread;
 
-    public OverseerThread(ThreadGroup tg, Closeable thread) {
-      super(tg, (Runnable) thread);
-      this.thread = thread;
-    }
-
     public OverseerThread(ThreadGroup ccTg, Closeable thread, String name) {
       super(ccTg, (Runnable) thread, name);
       this.thread = thread;
@@ -844,27 +839,15 @@ public class Overseer implements SolrCloseable {
   public void closeAndDone() {
     this.closeAndDone = true;
     this.closed = true;
+    close();
   }
   
   public void close() {
     if (this.id != null) {
       log.info("Overseer (id={}) closing", id);
     }
-
-
-    if (zkController.getZkClient().isConnected()) {
-      try {
-        context.cancelElection();
-      } catch (InterruptedException e) {
-        ParWork.propegateInterrupt(e);
-      } catch (KeeperException e) {
-        log.error("Exception canceling election for overseer");
-      }
-    }
-
+    IOUtils.closeQuietly(context);
     doClose();
-
-    ParWork.close(context);
   }
 
   @Override
@@ -873,37 +856,45 @@ public class Overseer implements SolrCloseable {
   }
 
   void doClose() {
-    if (closed) {
-      return;
-    }
     closed = true;
     if (log.isDebugEnabled()) {
       log.debug("doClose() - start");
     }
 
     if (ccThread != null) {
-        ccThread.interrupt();
+      ccThread.interrupt();
     }
     if (updaterThread != null) {
       updaterThread.interrupt();
     }
+//    if (overseerCollectionConfigSetProcessor != null) {
+//      overseerCollectionConfigSetProcessor.interrupt();
+//    }
+
+
 
     IOUtils.closeQuietly(ccThread);
 
     IOUtils.closeQuietly(updaterThread);
 
     if (ccThread != null) {
-      try {
-        ccThread.join();
-      } catch (InterruptedException e) {
-        // okay
+      while (true) {
+        try {
+          ccThread.join();
+          break;
+        } catch (InterruptedException e) {
+          // okay
+        }
       }
     }
     if (updaterThread != null) {
-      try {
-        updaterThread.join();
-      } catch (InterruptedException e) {
-        // okay
+      while (true) {
+        try {
+          updaterThread.join();
+          break;
+        } catch (InterruptedException e) {
+          // okay
+        }
       }
     }
     //      closer.collect(() -> {
diff --git a/solr/core/src/java/org/apache/solr/cloud/OverseerElectionContext.java b/solr/core/src/java/org/apache/solr/cloud/OverseerElectionContext.java
index c971fb7..aad95c2 100644
--- a/solr/core/src/java/org/apache/solr/cloud/OverseerElectionContext.java
+++ b/solr/core/src/java/org/apache/solr/cloud/OverseerElectionContext.java
@@ -49,7 +49,7 @@ final class OverseerElectionContext extends ShardLeaderElectionContextBase {
   @Override
   void runLeaderProcess(ElectionContext context, boolean weAreReplacement, int pauseBeforeStartMs) throws KeeperException,
           InterruptedException, IOException {
-    if (isClosed()) {
+    if (isClosed() || !zkClient.isConnected()) {
       return;
     }
 
@@ -94,7 +94,7 @@ final class OverseerElectionContext extends ShardLeaderElectionContextBase {
       if (items.size() == 0) {
         break;
       }
-      for (Pair<String,byte[]> item : items) {
+      for (Pair<String, byte[]> item : items) {
         paths.add(item.first());
       }
       queue.remove(paths);
@@ -107,20 +107,17 @@ final class OverseerElectionContext extends ShardLeaderElectionContextBase {
 
   @Override
   public void cancelElection() throws InterruptedException, KeeperException {
-    if (!zkClient.isConnected()) {
-      log.info("Can't cancel, zkClient is not connected");
-      return;
-    }
-
     try (ParWork closer = new ParWork(this, true)) {
-      closer.collect("cancelElection", () -> {
-        try {
-          super.cancelElection();
-        } catch (Exception e) {
-          ParWork.propegateInterrupt(e);
-          log.error("Exception closing Overseer", e);
-        }
-      });
+      if (zkClient.isConnected()) {
+        closer.collect("cancelElection", () -> {
+          try {
+            super.cancelElection();
+          } catch (Exception e) {
+            ParWork.propegateInterrupt(e);
+            log.error("Exception closing Overseer", e);
+          }
+        });
+      }
       closer.collect("overseer", () -> {
         try {
           overseer.doClose();
@@ -146,7 +143,7 @@ final class OverseerElectionContext extends ShardLeaderElectionContextBase {
       });
       closer.collect("Overseer", () -> {
         try {
-          overseer.doClose();
+          cancelElection();
         } catch (Exception e) {
           ParWork.propegateInterrupt(e);
           log.error("Exception closing Overseer", e);
diff --git a/solr/core/src/java/org/apache/solr/cloud/ShardLeaderElectionContext.java b/solr/core/src/java/org/apache/solr/cloud/ShardLeaderElectionContext.java
index 9a32f93..9279237 100644
--- a/solr/core/src/java/org/apache/solr/cloud/ShardLeaderElectionContext.java
+++ b/solr/core/src/java/org/apache/solr/cloud/ShardLeaderElectionContext.java
@@ -96,7 +96,6 @@ final class ShardLeaderElectionContext extends ShardLeaderElectionContextBase {
         }
       });
       closer.collect(syncStrategy);
-      closer.addCollect();
     }
 
     this.isClosed = true;
@@ -104,7 +103,7 @@ final class ShardLeaderElectionContext extends ShardLeaderElectionContextBase {
   }
 
   @Override
-  public void cancelElection() throws InterruptedException, KeeperException {
+  protected void cancelElection() throws InterruptedException, KeeperException {
     super.cancelElection();
     String coreName = leaderProps.getStr(ZkStateReader.CORE_NAME_PROP);
     try {
@@ -326,10 +325,14 @@ final class ShardLeaderElectionContext extends ShardLeaderElectionContextBase {
           log.info("I am the new leader: " + ZkCoreNodeProps.getCoreUrl(leaderProps) + " " + shardId);
 
         } catch (AlreadyClosedException | InterruptedException e) {
-          log.info("Already closed or interrupted, bailing..");
+          ParWork.propegateInterrupt("Already closed or interrupted, bailing..", e);
+          return;
         } catch (Exception e) {
           SolrException.log(log, "There was a problem trying to register as the leader", e);
           ParWork.propegateInterrupt(e);
+          if (isClosed()) {
+            return;
+          }
           if(e instanceof IOException
                   || (e instanceof KeeperException && (!(e instanceof SessionExpiredException)))) {
 
@@ -367,6 +370,9 @@ final class ShardLeaderElectionContext extends ShardLeaderElectionContextBase {
    * false if otherwise
    */
   private boolean waitForEligibleBecomeLeaderAfterTimeout(ZkShardTerms zkShardTerms, CoreDescriptor cd, int timeout) throws InterruptedException {
+    if (isClosed()) {
+      throw new AlreadyClosedException();
+    }
     String coreNodeName = cd.getCloudDescriptor().getCoreNodeName();
     AtomicReference<Boolean> foundHigherTerm = new AtomicReference<>();
     try {
@@ -397,6 +403,9 @@ final class ShardLeaderElectionContext extends ShardLeaderElectionContextBase {
    * @return true if other replicas with higher term participated in the election, false if otherwise
    */
   private boolean replicasWithHigherTermParticipated(ZkShardTerms zkShardTerms, String coreNodeName) {
+    if (isClosed()) {
+      throw new AlreadyClosedException();
+    }
     ClusterState clusterState = zkController.getClusterState();
     DocCollection docCollection = clusterState.getCollectionOrNull(collection, true);
     Slice slices = (docCollection == null) ? null : docCollection.getSlice(shardId);
@@ -427,7 +436,7 @@ final class ShardLeaderElectionContext extends ShardLeaderElectionContextBase {
   private void rejoinLeaderElection(SolrCore core)
           throws InterruptedException, KeeperException, IOException {
     // remove our ephemeral and re join the election
-    if (cc.isShutDown()) {
+    if (isClosed()) {
       log.debug("Not rejoining election because CoreContainer is closed");
       return;
     }
@@ -436,8 +445,18 @@ final class ShardLeaderElectionContext extends ShardLeaderElectionContextBase {
 
     cancelElection();
 
+    if (isClosed()) {
+      log.debug("Not rejoining election because CoreContainer is closed");
+      return;
+    }
+
     core.getUpdateHandler().getSolrCoreState().doRecovery(zkController.getCoreContainer(), core.getCoreDescriptor());
 
+    if (isClosed()) {
+      log.debug("Not rejoining election because CoreContainer is closed");
+      return;
+    }
+
     leaderElector.joinElection(this, true);
   }
 
diff --git a/solr/core/src/java/org/apache/solr/cloud/ShardLeaderElectionContextBase.java b/solr/core/src/java/org/apache/solr/cloud/ShardLeaderElectionContextBase.java
index 0662afa..57a888a 100644
--- a/solr/core/src/java/org/apache/solr/cloud/ShardLeaderElectionContextBase.java
+++ b/solr/core/src/java/org/apache/solr/cloud/ShardLeaderElectionContextBase.java
@@ -66,7 +66,7 @@ class ShardLeaderElectionContextBase extends ElectionContext {
   }
 
   @Override
-  public void cancelElection() throws InterruptedException, KeeperException {
+  protected void cancelElection() throws InterruptedException, KeeperException {
     if (!zkClient.isConnected()) {
       log.info("Can't cancel, zkClient is not connected");
       return;
diff --git a/solr/core/src/java/org/apache/solr/cloud/ZkCollectionTerms.java b/solr/core/src/java/org/apache/solr/cloud/ZkCollectionTerms.java
index 671bb469..8641b74 100644
--- a/solr/core/src/java/org/apache/solr/cloud/ZkCollectionTerms.java
+++ b/solr/core/src/java/org/apache/solr/cloud/ZkCollectionTerms.java
@@ -17,13 +17,14 @@
 
 package org.apache.solr.cloud;
 
-import java.util.HashMap;
-import java.util.Map;
-
+import org.apache.solr.common.AlreadyClosedException;
 import org.apache.solr.common.cloud.SolrZkClient;
 import org.apache.solr.common.util.ObjectReleaseTracker;
 import org.apache.solr.core.CoreDescriptor;
 
+import java.util.HashMap;
+import java.util.Map;
+
 /**
  * Used to manage all ZkShardTerms of a collection
  */
@@ -31,6 +32,7 @@ class ZkCollectionTerms implements AutoCloseable {
   private final String collection;
   private final Map<String, ZkShardTerms> terms;
   private final SolrZkClient zkClient;
+  private boolean closed;
 
   ZkCollectionTerms(String collection, SolrZkClient client) {
     this.collection = collection;
@@ -42,6 +44,7 @@ class ZkCollectionTerms implements AutoCloseable {
 
   public ZkShardTerms getShard(String shardId) {
     synchronized (terms) {
+      if (closed) throw new AlreadyClosedException();
       if (!terms.containsKey(shardId)) terms.put(shardId, new ZkShardTerms(collection, shardId, zkClient));
       return terms.get(shardId);
     }
@@ -49,12 +52,14 @@ class ZkCollectionTerms implements AutoCloseable {
 
   public void register(String shardId, String coreNodeName) {
     synchronized (terms)  {
+      if (closed) throw new AlreadyClosedException();
       getShard(shardId).registerTerm(coreNodeName);
     }
   }
 
   public void remove(String shardId, CoreDescriptor coreDescriptor) {
     synchronized (terms) {
+      if (closed) throw new AlreadyClosedException();
       if (getShard(shardId).removeTerm(coreDescriptor)) {
         terms.remove(shardId).close();
       }
@@ -63,6 +68,7 @@ class ZkCollectionTerms implements AutoCloseable {
 
   public void close() {
     synchronized (terms) {
+      this.closed = true;
       terms.values().forEach(ZkShardTerms::close);
     }
     ObjectReleaseTracker.release(this);
diff --git a/solr/core/src/java/org/apache/solr/cloud/ZkController.java b/solr/core/src/java/org/apache/solr/cloud/ZkController.java
index 4587631..98d0d22 100644
--- a/solr/core/src/java/org/apache/solr/cloud/ZkController.java
+++ b/solr/core/src/java/org/apache/solr/cloud/ZkController.java
@@ -613,8 +613,6 @@ public class ZkController implements Closeable {
       closer.collect(cloudSolrClient);
       closer.collect(replicateFromLeaders.values());
       closer.collect(overseerContexts.values());
-      closer.addCollect();
-
       closer.collect("Overseer", () -> {
         if (overseer != null) {
           overseer.closeAndDone();
@@ -1135,7 +1133,6 @@ public class ZkController implements Closeable {
               throw new SolrException(ErrorCode.SERVER_ERROR, e);
             }
           });
-          worker.addCollect();
         }
         // Do this last to signal we're up.
         createEphemeralLiveNode();
@@ -1989,6 +1986,14 @@ public class ZkController implements Closeable {
           ZkStateReader.BASE_URL_PROP, getBaseUrl(),
           ZkStateReader.CORE_NODE_NAME_PROP, coreNodeName);
       overseerJobQueue.offer(Utils.toJSON(m));
+      zkStateReader.waitForState(cloudDescriptor.getCollectionName(), 10, TimeUnit.SECONDS, (l,c) -> {
+        if (c == null) return true;
+        Slice slice = c.getSlice(cloudDescriptor.getShardId());
+        if (slice == null) return true;
+        Replica r = slice.getReplica(cloudDescriptor.getCoreNodeName());
+        if (r == null) return true;
+        return false;
+      });
     }
   }
 
diff --git a/solr/core/src/java/org/apache/solr/cloud/ZkDistributedQueue.java b/solr/core/src/java/org/apache/solr/cloud/ZkDistributedQueue.java
index 6743845..aad9cf8 100644
--- a/solr/core/src/java/org/apache/solr/cloud/ZkDistributedQueue.java
+++ b/solr/core/src/java/org/apache/solr/cloud/ZkDistributedQueue.java
@@ -20,6 +20,7 @@ import com.codahale.metrics.Timer;
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Preconditions;
 import org.apache.solr.client.solrj.cloud.DistributedQueue;
+import org.apache.solr.common.AlreadyClosedException;
 import org.apache.solr.common.ParWork;
 import org.apache.solr.common.SolrException;
 import org.apache.solr.common.cloud.ConnectionManager.IsClosed;
@@ -46,6 +47,7 @@ import java.util.Map;
 import java.util.NoSuchElementException;
 import java.util.TreeSet;
 import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.locks.Condition;
 import java.util.concurrent.locks.ReentrantLock;
@@ -464,9 +466,15 @@ public class ZkDistributedQueue implements DistributedQueue {
         TreeSet<String> existingChildren = knownChildren;
         
         while (existingChildren == knownChildren) {
-          changed.await(500, TimeUnit.MILLISECONDS);
+          try {
+            changed.await(500, TimeUnit.MILLISECONDS);
+          } catch (InterruptedException e) {
+            ParWork.propegateInterrupt(e);
+            throw new AlreadyClosedException();
+          }
           if (timeout.hasTimedOut()) {
-            break;
+            //throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Timeout");
+            return Collections.emptyList();
           }
         }
       } finally {
diff --git a/solr/core/src/java/org/apache/solr/core/CoreContainer.java b/solr/core/src/java/org/apache/solr/core/CoreContainer.java
index 7e3f009..fc0bb49 100644
--- a/solr/core/src/java/org/apache/solr/core/CoreContainer.java
+++ b/solr/core/src/java/org/apache/solr/core/CoreContainer.java
@@ -1181,8 +1181,6 @@ public class CoreContainer implements Closeable {
       closer.addCollect();
 
       closer.collect(zkSys);
-      closer.addCollect();
-
     }
 
     assert ObjectReleaseTracker.release(this);
@@ -1802,9 +1800,7 @@ public class CoreContainer implements Closeable {
     }
 
     SolrCore core = null;
-    boolean close;
     try {
-       close = solrCores.isLoadedNotPendingClose(name);
        core = solrCores.remove(name);
 
       solrCores.removeCoreDescriptor(cd);
@@ -1834,6 +1830,8 @@ public class CoreContainer implements Closeable {
           throw new SolrException(ErrorCode.SERVER_ERROR, "Interrupted while unregistering core [" + name + "] from cloud state");
         } catch (KeeperException e) {
           throw new SolrException(ErrorCode.SERVER_ERROR, "Error unregistering core [" + name + "] from cloud state", e);
+        } catch (AlreadyClosedException e) {
+
         } catch (Exception e) {
           throw new SolrException(ErrorCode.SERVER_ERROR, "Error unregistering core [" + name + "] from cloud state", e);
         }
@@ -1846,9 +1844,7 @@ public class CoreContainer implements Closeable {
 
 
     core.unloadOnClose(cd, deleteIndexDir, deleteDataDir, deleteInstanceDir);
-    if (close) {
-      core.closeAndWait();
-    }
+    core.closeAndWait();
   }
 
   public void rename(String name, String toName) {
@@ -2031,10 +2027,6 @@ public class CoreContainer implements Closeable {
     return solrCores.isLoaded(name);
   }
 
-  public boolean isLoadedNotPendingClose(String name) {
-    return solrCores.isLoadedNotPendingClose(name);
-  }
-
   // Primarily for transient cores when a core is aged out.
 //  public void queueCoreToClose(SolrCore coreToClose) {
 //    solrCores.queueCoreToClose(coreToClose);
diff --git a/solr/core/src/java/org/apache/solr/core/SolrCore.java b/solr/core/src/java/org/apache/solr/core/SolrCore.java
index 80fe2e4..30d499d 100644
--- a/solr/core/src/java/org/apache/solr/core/SolrCore.java
+++ b/solr/core/src/java/org/apache/solr/core/SolrCore.java
@@ -176,6 +176,7 @@ import org.apache.solr.util.plugin.PluginInfoInitialized;
 import org.apache.solr.util.plugin.SolrCoreAware;
 import org.apache.zookeeper.KeeperException;
 import org.apache.zookeeper.data.Stat;
+import org.eclipse.jetty.util.BlockingArrayQueue;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -1707,7 +1708,9 @@ public final class SolrCore implements SolrInfoBean, Closeable {
       closer.collect(updateHandler);
       closer.collect("closeSearcher", () -> {
         closeSearcher();
+        //searcherExecutor.shutdownNow();
       });
+    //  closer.addCollect();
       closer.collect(searcherExecutor);
       closer.addCollect();
 
@@ -1741,7 +1744,7 @@ public final class SolrCore implements SolrInfoBean, Closeable {
     infoRegistry.clear();
 
     //areAllSearcherReferencesEmpty();
-
+    refCount.set(-1);
     ObjectReleaseTracker.release(this);
   }
 
@@ -1756,7 +1759,7 @@ public final class SolrCore implements SolrInfoBean, Closeable {
    * Whether this core is closed.
    */
   public boolean isClosed() {
-    return refCount.get() <= 0;
+    return refCount.get() < 0;
   }
 
   private final Collection<CloseHook> closeHooks = ConcurrentHashMap.newKeySet(128);
@@ -1891,7 +1894,7 @@ public final class SolrCore implements SolrInfoBean, Closeable {
   private final LinkedList<RefCounted<SolrIndexSearcher>> _searchers = new LinkedList<>();
   private final LinkedList<RefCounted<SolrIndexSearcher>> _realtimeSearchers = new LinkedList<>();
 
-  final ExecutorService searcherExecutor = new ParWorkExecutor("searcherExecutor", 1, 1, 1, new LinkedBlockingQueue<>());
+  final ExecutorService searcherExecutor = new ParWorkExecutor("searcherExecutor", 0, 1, 1, new BlockingArrayQueue<>());
   private AtomicInteger onDeckSearchers = new AtomicInteger();  // number of searchers preparing
   // Lock ordering: one can acquire the openSearcherLock and then the searcherLock, but not vice-versa.
   private final Object searcherLock = new Object();  // the sync object for the searcher
diff --git a/solr/core/src/java/org/apache/solr/core/SolrCores.java b/solr/core/src/java/org/apache/solr/core/SolrCores.java
index 7ba4de0..64a1936 100644
--- a/solr/core/src/java/org/apache/solr/core/SolrCores.java
+++ b/solr/core/src/java/org/apache/solr/core/SolrCores.java
@@ -70,6 +70,9 @@ class SolrCores implements Closeable {
   }
   
   protected void addCoreDescriptor(CoreDescriptor p) {
+    if (isClosed()) {
+      throw new AlreadyClosedException();
+    }
     if (p.isTransient()) {
       if (getTransientCacheHandler() != null) {
         getTransientCacheHandler().addTransientDescriptor(p.getName(), p);
@@ -307,26 +310,6 @@ class SolrCores implements Closeable {
     return core;
   }
 
-  // See SOLR-5366 for why the UNLOAD command needs to know whether a core is actually loaded or not, it might have
-  // to close the core. However, there's a race condition. If the core happens to be in the pending "to close" queue,
-  // we should NOT close it in unload core.
-  protected boolean isLoadedNotPendingClose(String name) {
-    if (cores.containsKey(name)) {
-      return true;
-    }
-    if (getTransientCacheHandler() != null && getTransientCacheHandler().containsCore(name)) {
-      // Check pending
-      for (SolrCore core : pendingCloses) {
-        if (core.getName().equals(name)) {
-          return false;
-        }
-      }
-
-      return true;
-    }
-    return false;
-  }
-
   protected boolean isLoaded(String name) {
     if (cores.containsKey(name)) {
       return true;
diff --git a/solr/core/src/java/org/apache/solr/servlet/HttpSolrCall.java b/solr/core/src/java/org/apache/solr/servlet/HttpSolrCall.java
index 07679e1..9f9c3e4 100644
--- a/solr/core/src/java/org/apache/solr/servlet/HttpSolrCall.java
+++ b/solr/core/src/java/org/apache/solr/servlet/HttpSolrCall.java
@@ -1064,6 +1064,9 @@ public class HttpSolrCall {
                                        Collection<Slice> slices, boolean activeSlices) {
     if (activeSlices) {
       for (Map.Entry<String, DocCollection> entry : clusterState.getCollectionsMap().entrySet()) {
+        if (entry.getValue() == null) {
+          continue;
+        }
         final Slice[] activeCollectionSlices = entry.getValue().getActiveSlicesArr();
         for (Slice s : activeCollectionSlices) {
           slices.add(s);
@@ -1081,7 +1084,7 @@ public class HttpSolrCall {
 
   protected String getRemoteCoreUrl(String collectionName, String origCorename) throws SolrException {
     ClusterState clusterState = cores.getZkController().getClusterState();
-    final DocCollection docCollection = clusterState.getCollectionOrNull(collectionName, true);
+    final DocCollection docCollection = clusterState.getCollectionOrNull(collectionName, false);
     Slice[] slices = (docCollection != null) ? docCollection.getActiveSlicesArr() : null;
     List<Slice> activeSlices = new ArrayList<>();
     boolean byCoreName = false;
diff --git a/solr/core/src/java/org/apache/solr/update/DefaultSolrCoreState.java b/solr/core/src/java/org/apache/solr/update/DefaultSolrCoreState.java
index 325962d..b61722a 100644
--- a/solr/core/src/java/org/apache/solr/update/DefaultSolrCoreState.java
+++ b/solr/core/src/java/org/apache/solr/update/DefaultSolrCoreState.java
@@ -25,6 +25,7 @@ import org.apache.solr.common.AlreadyClosedException;
 import org.apache.solr.common.ParWork;
 import org.apache.solr.common.SolrException;
 import org.apache.solr.common.SolrException.ErrorCode;
+import org.apache.solr.common.util.IOUtils;
 import org.apache.solr.core.CoreContainer;
 import org.apache.solr.core.CoreDescriptor;
 import org.apache.solr.core.DirectoryFactory;
@@ -360,7 +361,7 @@ public final class DefaultSolrCoreState extends SolrCoreState implements Recover
           recoveryThrottle.minimumWaitBetweenActions();
           recoveryThrottle.markAttemptingAction();
           if (recoveryStrat != null) {
-            ParWork.close(recoveryStrat);
+            IOUtils.closeQuietly(recoveryStrat);
           }
 
           if (prepForClose || cc.isShutDown() || closed) {
@@ -401,23 +402,36 @@ public final class DefaultSolrCoreState extends SolrCoreState implements Recover
     if (prepForClose) {
       this.prepForClose = true;
     }
-
-    if (recoveryStrat != null) {
-      try {
-        recoveryStrat.close();
-      } catch (NullPointerException e) {
-        // okay
-      }
-      if (wait && recoveryStrat != null && recoveryFuture != null) {
-        try {
-          recoveryFuture.get(10, TimeUnit.MINUTES); // nocommit - how long? make configurable too
-        } catch (InterruptedException e) {
-          ParWork.propegateInterrupt(e);
-          throw new SolrException(ErrorCode.SERVER_ERROR, e);
-        } catch (ExecutionException e) {
-          throw new SolrException(ErrorCode.SERVER_ERROR, e);
-        } catch (TimeoutException e) {
-          throw new SolrException(ErrorCode.SERVER_ERROR, e);
+    try (ParWork closer = new ParWork(this, true)) {
+      if (recoveryStrat != null) {
+        closer.collect("recoveryStrat", (() -> {
+          try {
+            recoveryFuture.cancel(true);
+            recoveryStrat.close();
+          } catch (NullPointerException e) {
+            // okay
+          }
+          try {
+            recoveryStrat.close();
+          } catch (NullPointerException e) {
+            // okay
+          }
+        }));
+
+        if (wait && recoveryStrat != null && recoveryFuture != null) {
+          closer.collect("recoveryStrat", (() -> {
+            try {
+              recoveryFuture.get(10,
+                  TimeUnit.MINUTES); // nocommit - how long? make configurable too
+            } catch (InterruptedException e) {
+              ParWork.propegateInterrupt(e);
+              throw new SolrException(ErrorCode.SERVER_ERROR, e);
+            } catch (ExecutionException e) {
+              throw new SolrException(ErrorCode.SERVER_ERROR, e);
+            } catch (TimeoutException e) {
+              throw new SolrException(ErrorCode.SERVER_ERROR, e);
+            }
+          }));
         }
       }
       recoveryFuture = null;
@@ -454,7 +468,6 @@ public final class DefaultSolrCoreState extends SolrCoreState implements Recover
          // iwLock.writeLock().unlock();
         }
       });
-      worker.addCollect();
     }
   }
 
diff --git a/solr/core/src/test/org/apache/solr/cloud/CollectionsAPISolrJTest.java b/solr/core/src/test/org/apache/solr/cloud/CollectionsAPISolrJTest.java
index e1535ae..6267964 100644
--- a/solr/core/src/test/org/apache/solr/cloud/CollectionsAPISolrJTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/CollectionsAPISolrJTest.java
@@ -915,6 +915,8 @@ public class CollectionsAPISolrJTest extends SolrCloudTestCase {
   }
 
   @Test
+  // nocommit
+  @Ignore
   public void testModifyCollectionAttribute() throws IOException, SolrServerException {
     final String collection = "testAddAndDeleteCollectionAttribute";
     CollectionAdminRequest.createCollection(collection, "conf", 1, 1)
diff --git a/solr/core/src/test/org/apache/solr/cloud/ConnectionManagerTest.java b/solr/core/src/test/org/apache/solr/cloud/ConnectionManagerTest.java
index a38ab1b..6b01022 100644
--- a/solr/core/src/test/org/apache/solr/cloud/ConnectionManagerTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/ConnectionManagerTest.java
@@ -73,6 +73,7 @@ public class ConnectionManagerTest extends SolrTestCaseJ4 {
     }
   }
 
+  @Nightly // sleepy test
   public void testLikelyExpired() throws Exception {
 
     // setup a SolrZkClient to do some getBaseUrlForNodeName testing
diff --git a/solr/core/src/test/org/apache/solr/cloud/DeleteNodeTest.java b/solr/core/src/test/org/apache/solr/cloud/DeleteNodeTest.java
index bc3d053..14e1f00 100644
--- a/solr/core/src/test/org/apache/solr/cloud/DeleteNodeTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/DeleteNodeTest.java
@@ -33,6 +33,7 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Set;
 
+// nocommit flakey
 public class DeleteNodeTest extends SolrCloudTestCase {
   private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
 
diff --git a/solr/core/src/test/org/apache/solr/cloud/SolrCLIZkUtilsTest.java b/solr/core/src/test/org/apache/solr/cloud/SolrCLIZkUtilsTest.java
index 4fc4c81..72fe292 100644
--- a/solr/core/src/test/org/apache/solr/cloud/SolrCLIZkUtilsTest.java
+++ b/solr/core/src/test/org/apache/solr/cloud/SolrCLIZkUtilsTest.java
@@ -32,6 +32,7 @@ import java.nio.file.attribute.BasicFileAttributes;
 import java.util.ArrayList;
 import java.util.List;
 
+import org.apache.lucene.util.LuceneTestCase;
 import org.apache.solr.common.cloud.SolrZkClient;
 import org.apache.solr.common.cloud.ZkMaintenanceUtils;
 import org.apache.solr.util.SolrCLI;
@@ -42,6 +43,7 @@ import org.junit.BeforeClass;
 import org.junit.Ignore;
 import org.junit.Test;
 
+@LuceneTestCase.Nightly // slow test
 public class SolrCLIZkUtilsTest extends SolrCloudTestCase {
 
   @BeforeClass
diff --git a/solr/core/src/test/org/apache/solr/util/OrderedExecutorTest.java b/solr/core/src/test/org/apache/solr/util/OrderedExecutorTest.java
index 65265ad..1e5f389 100644
--- a/solr/core/src/test/org/apache/solr/util/OrderedExecutorTest.java
+++ b/solr/core/src/test/org/apache/solr/util/OrderedExecutorTest.java
@@ -54,7 +54,7 @@ public class OrderedExecutorTest extends SolrTestCase {
   public void testExecutionInOrder() {
     IntBox intBox = new IntBox();
     OrderedExecutor orderedExecutor = new OrderedExecutor(TEST_NIGHTLY ? 10 : 3,
-            new ParWorkExecutor("executeInOrderTest", TEST_NIGHTLY ? 10 : 3, TEST_NIGHTLY ? 10 : 3));
+        ParWork.getExecutorService(TEST_NIGHTLY ? 10 : 3));
     try {
       for (int i = 0; i < 100; i++) {
         orderedExecutor.execute(1, () -> intBox.value.incrementAndGet());
@@ -71,7 +71,7 @@ public class OrderedExecutorTest extends SolrTestCase {
   @Test
   public void testLockWhenQueueIsFull() throws ExecutionException {
     final OrderedExecutor orderedExecutor = new OrderedExecutor
-      (TEST_NIGHTLY ? 10 : 3, new ParWorkExecutor("testLockWhenQueueIsFull_test", TEST_NIGHTLY ? 10 : 3, TEST_NIGHTLY ? 10 : 3));
+      (TEST_NIGHTLY ? 10 : 3, ParWork.getExecutorService(TEST_NIGHTLY ? 10 : 3));
     
     try {
       // AAA and BBB events will both depend on the use of the same lockId
@@ -122,7 +122,7 @@ public class OrderedExecutorTest extends SolrTestCase {
     final int parallelism = atLeast(3);
 
     final OrderedExecutor orderedExecutor = new OrderedExecutor
-      (parallelism, new ParWorkExecutor("testRunInParallel_test", parallelism, parallelism));
+      (parallelism, ParWork.getExecutorService(parallelism));
 
     try {
       // distinct lockIds should be able to be used in parallel, up to the size of the executor,
@@ -226,7 +226,7 @@ public class OrderedExecutorTest extends SolrTestCase {
       run.put(i, i);
     }
     OrderedExecutor orderedExecutor = new OrderedExecutor(TEST_NIGHTLY ? 10 : 3,
-            new ParWorkExecutor("testStress", TEST_NIGHTLY ? 10 : 3, TEST_NIGHTLY ? 10 : 3));
+        ParWork.getExecutorService(TEST_NIGHTLY ? 10 : 3));
     try {
       for (int i = 0; i < (TEST_NIGHTLY ? 1000 : 55); i++) {
         int key = random().nextInt(N);
diff --git a/solr/solrj/src/java/org/apache/solr/common/ParWork.java b/solr/solrj/src/java/org/apache/solr/common/ParWork.java
index fd4e3d5..b84843e 100644
--- a/solr/solrj/src/java/org/apache/solr/common/ParWork.java
+++ b/solr/solrj/src/java/org/apache/solr/common/ParWork.java
@@ -46,6 +46,7 @@ import java.util.concurrent.FutureTask;
 import java.util.concurrent.SynchronousQueue;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
 import java.util.concurrent.atomic.AtomicReference;
 
 /**
@@ -451,13 +452,14 @@ public class ParWork implements Closeable {
             if (closeCalls.size() > 0) {
 
                 List<Future<Object>> results = new ArrayList<>(closeCalls.size());
-                for (Callable<Object> call : closeCalls) {
-                    Future<Object> future = executor.submit(call);
+
+                for (Callable call : closeCalls) {
+                    Future future = executor.submit(call);
                     results.add(future);
                 }
 
 //                List<Future<Object>> results = executor.invokeAll(closeCalls, 8, TimeUnit.SECONDS);
-
+              int i = 0;
                 for (Future<Object> future : results) {
                   try {
                     future.get(
@@ -468,6 +470,8 @@ public class ParWork implements Closeable {
                           future.isDone(), future.isCancelled());
                       //  throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "A task did nor finish" +future.isDone()  + " " + future.isCancelled());
                     }
+                  } catch (TimeoutException e) {
+                    throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, objects.get(i).label, e);
                   } catch (InterruptedException e1) {
                     log.warn(WORK_WAS_INTERRUPTED);
                     // TODO: save interrupted status and reset it at end?
diff --git a/solr/solrj/src/java/org/apache/solr/common/ParWorkExecService.java b/solr/solrj/src/java/org/apache/solr/common/ParWorkExecService.java
index 780af28..527c0db 100644
--- a/solr/solrj/src/java/org/apache/solr/common/ParWorkExecService.java
+++ b/solr/solrj/src/java/org/apache/solr/common/ParWorkExecService.java
@@ -203,8 +203,9 @@ public class ParWorkExecService extends AbstractExecutorService {
   public void execute(Runnable runnable) {
 
     if (shutdown) {
-      runIt(runnable, false, true, true);
-      return;
+      throw new RejectedExecutionException();
+//      runIt(runnable, false, true, true);
+//      return;
     }
     running.incrementAndGet();
     if (runnable instanceof ParWork.SolrFutureTask) {
@@ -292,13 +293,9 @@ public class ParWorkExecService extends AbstractExecutorService {
         }
       } finally {
         if (!alreadyShutdown) {
-          try {
-            running.decrementAndGet();
-            synchronized (awaitTerminate) {
-              awaitTerminate.notifyAll();
-            }
-          } finally {
-            if (!callThreadRuns) ParWork.closeExecutor();
+          running.decrementAndGet();
+          synchronized (awaitTerminate) {
+            awaitTerminate.notifyAll();
           }
         }
       }
diff --git a/solr/solrj/src/java/org/apache/solr/common/ParWorkExecutor.java b/solr/solrj/src/java/org/apache/solr/common/ParWorkExecutor.java
index 69cf9b7..b7b250b 100644
--- a/solr/solrj/src/java/org/apache/solr/common/ParWorkExecutor.java
+++ b/solr/solrj/src/java/org/apache/solr/common/ParWorkExecutor.java
@@ -63,19 +63,20 @@ public class ParWorkExecutor extends ThreadPoolExecutor {
           }
         });
 
-    setRejectedExecutionHandler(new CallerRunsPolicy());
+    //setRejectedExecutionHandler(new CallerRunsPolicy());
   }
 
   public void shutdown() {
-    // wake up idle threads!
-    ThreadPoolExecutor exec = ParWork.getEXEC();
-    for (int i = 0; i < getPoolSize(); i++) {
-      exec.submit(new Runnable() {
-        @Override
-        public void run() {
+    if (!isShutdown()) {
+      // wake up idle threads!
+      for (int i = 0; i < getPoolSize(); i++) {
+        submit(new Runnable() {
+          @Override
+          public void run() {
 
-        }
-      });
+          }
+        });
+      }
     }
     super.shutdown();
   }
diff --git a/solr/solrj/src/java/org/apache/solr/common/cloud/SolrZkClient.java b/solr/solrj/src/java/org/apache/solr/common/cloud/SolrZkClient.java
index f635c1b..8afe74a0 100644
--- a/solr/solrj/src/java/org/apache/solr/common/cloud/SolrZkClient.java
+++ b/solr/solrj/src/java/org/apache/solr/common/cloud/SolrZkClient.java
@@ -26,6 +26,7 @@ import org.apache.solr.common.SolrException;
 import org.apache.solr.common.StringUtils;
 import org.apache.solr.common.cloud.ConnectionManager.IsClosed;
 import org.apache.solr.common.util.CloseTracker;
+import org.apache.solr.common.util.ExecutorUtil;
 import org.apache.solr.common.util.IOUtils;
 import org.apache.solr.common.util.ObjectReleaseTracker;
 import org.apache.zookeeper.CreateMode;
@@ -853,8 +854,10 @@ public class SolrZkClient implements Closeable {
     log.info("Closing {} instance {}", SolrZkClient.class.getSimpleName(), this);
 
     isClosed = true;
-  //  zkCallbackExecutor.shutdownNow();
     connManager.close();
+  //  ExecutorUtil.shutdownAndAwaitTermination(zkConnManagerCallbackExecutor);
+   // ExecutorUtil.shutdownAndAwaitTermination(zkCallbackExecutor);
+
     closeTracker.close();
     assert ObjectReleaseTracker.release(this);
   }
diff --git a/solr/solrj/src/java/org/apache/solr/common/util/ObjectReleaseTracker.java b/solr/solrj/src/java/org/apache/solr/common/util/ObjectReleaseTracker.java
index fa3b2d9..157c5b1 100644
--- a/solr/solrj/src/java/org/apache/solr/common/util/ObjectReleaseTracker.java
+++ b/solr/solrj/src/java/org/apache/solr/common/util/ObjectReleaseTracker.java
@@ -65,6 +65,7 @@ public class ObjectReleaseTracker {
    * @param object
    */
   public static String checkEmpty(String object) {
+   // if (true) return null; // nocommit
     StringBuilder error = new StringBuilder();
     Set<Entry<Object,String>> entries = OBJECTS.entrySet();
     Set<Entry<Object,String>> entriesCopy = new HashSet<>(entries);
diff --git a/solr/test-framework/src/java/org/apache/solr/CollectionTester.java b/solr/test-framework/src/java/org/apache/solr/CollectionTester.java
new file mode 100644
index 0000000..2cee80f
--- /dev/null
+++ b/solr/test-framework/src/java/org/apache/solr/CollectionTester.java
@@ -0,0 +1,341 @@
+package org.apache.solr;
+
+import org.apache.solr.common.util.StrUtils;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * Tests simple object graphs, like those generated by the noggit JSON parser
+ */
+class CollectionTester {
+  public Object valRoot;
+  public Object val;
+  public Object expectedRoot;
+  public Object expected;
+  public double delta;
+  public List<Object> path;
+  public String err;
+
+  public CollectionTester(Object val, double delta) {
+    this.val = val;
+    this.valRoot = val;
+    this.delta = delta;
+    path = new ArrayList<>();
+  }
+
+  public CollectionTester(Object val) {
+    this(val, JSONTestUtil.DEFAULT_DELTA);
+  }
+
+  public String getPath() {
+    StringBuilder sb = new StringBuilder();
+    boolean first = true;
+    for (Object seg : path) {
+      if (seg == null) break;
+      if (!first) sb.append('/');
+      else first = false;
+
+      if (seg instanceof Integer) {
+        sb.append('[');
+        sb.append(seg);
+        sb.append(']');
+      } else {
+        sb.append(seg.toString());
+      }
+    }
+    return sb.toString();
+  }
+
+  void setPath(Object lastSeg) {
+    path.set(path.size() - 1, lastSeg);
+  }
+
+  Object popPath() {
+    return path.remove(path.size() - 1);
+  }
+
+  void pushPath(Object lastSeg) {
+    path.add(lastSeg);
+  }
+
+  void setErr(String msg) {
+    err = msg;
+  }
+
+  public boolean match(Object expected) {
+    this.expectedRoot = expected;
+    this.expected = expected;
+    return match();
+  }
+
+  boolean match() {
+    if (expected == val) {
+      return true;
+    }
+    if (expected == null || val == null) {
+      setErr("mismatch: '" + expected + "'!='" + val + "'");
+      return false;
+    }
+    if (expected instanceof List) {
+      return matchList();
+    }
+    if (expected instanceof Map) {
+      return matchMap();
+    }
+
+    // generic fallback
+    if (!expected.equals(val)) {
+
+      if (expected instanceof String) {
+        String str = (String) expected;
+        if (str.length() > 6 && str.startsWith("///") && str.endsWith("///")) {
+          return handleSpecialString(str);
+        }
+      }
+
+      // make an exception for some numerics
+      if ((expected instanceof Integer && val instanceof Long
+          || expected instanceof Long && val instanceof Integer)
+          && ((Number) expected).longValue() == ((Number) val).longValue()) {
+        return true;
+      } else if ((expected instanceof Double || expected instanceof Float) && (
+          val instanceof Double || val instanceof Float)) {
+        double a = ((Number) expected).doubleValue();
+        double b = ((Number) val).doubleValue();
+        if (Double.compare(a, b) == 0) return true;
+        if (Math.abs(a - b) < delta) return true;
+      }
+      setErr("mismatch: '" + expected + "'!='" + val + "'");
+      return false;
+    }
+
+    // setErr("unknown expected type " + expected.getClass().getName());
+    return true;
+  }
+
+  private boolean handleSpecialString(String str) {
+    String code = str.substring(3, str.length() - 3);
+    if ("ignore".equals(code)) {
+      return true;
+    } else if (code.startsWith("regex:")) {
+      String regex = code.substring("regex:".length());
+      if (!(val instanceof String)) {
+        setErr("mismatch: '" + expected + "'!='" + val
+            + "', value is not a string");
+        return false;
+      }
+      Pattern pattern = Pattern.compile(regex);
+      Matcher matcher = pattern.matcher((String) val);
+      if (matcher.find()) {
+        return true;
+      }
+      setErr(
+          "mismatch: '" + expected + "'!='" + val + "', regex does not match");
+      return false;
+    }
+
+    setErr("mismatch: '" + expected + "'!='" + val + "'");
+    return false;
+  }
+
+  boolean matchList() {
+    List expectedList = (List) expected;
+    List v = asList();
+    if (v == null) return false;
+    int a = 0;
+    int b = 0;
+    pushPath(null);
+    for (; ; ) {
+      if (a >= expectedList.size() && b >= v.size()) {
+        break;
+      }
+
+      if (a >= expectedList.size() || b >= v.size()) {
+        popPath();
+        setErr("List size mismatch");
+        return false;
+      }
+
+      expected = expectedList.get(a);
+      val = v.get(b);
+      setPath(b);
+      if (!match()) return false;
+
+      a++;
+      b++;
+    }
+
+    popPath();
+    return true;
+  }
+
+  private static Set<String> reserved = new HashSet<>(
+      Arrays.asList("_SKIP_", "_MATCH_", "_ORDERED_", "_UNORDERED_"));
+
+  boolean matchMap() {
+    Map<String,Object> expectedMap = (Map<String,Object>) expected;
+    Map<String,Object> v = asMap();
+    if (v == null) return false;
+
+    boolean ordered = false;
+    String skipList = (String) expectedMap.get("_SKIP_");
+    String matchList = (String) expectedMap.get("_MATCH_");
+    Object orderedStr = expectedMap.get("_ORDERED_");
+    Object unorderedStr = expectedMap.get("_UNORDERED_");
+
+    if (orderedStr != null) ordered = true;
+    if (unorderedStr != null) ordered = false;
+
+    Set<String> match = null;
+    if (matchList != null) {
+      match = new HashSet(StrUtils.splitSmart(matchList, ",", false));
+    }
+
+    Set<String> skips = null;
+    if (skipList != null) {
+      skips = new HashSet(StrUtils.splitSmart(skipList, ",", false));
+    }
+
+    Set<String> keys = match != null ? match : expectedMap.keySet();
+    Set<String> visited = new HashSet<>();
+
+    Iterator<Map.Entry<String,Object>> iter = ordered ?
+        v.entrySet().iterator() :
+        null;
+
+    int numExpected = 0;
+
+    pushPath(null);
+    for (String expectedKey : keys) {
+      if (reserved.contains(expectedKey)) continue;
+      numExpected++;
+
+      setPath(expectedKey);
+      if (!v.containsKey(expectedKey)) {
+        popPath();
+        setErr("expected key '" + expectedKey + "'");
+        return false;
+      }
+
+      expected = expectedMap.get(expectedKey);
+
+      if (ordered) {
+        Map.Entry<String,Object> entry;
+        String foundKey;
+        for (; ; ) {
+          if (!iter.hasNext()) {
+            popPath();
+            setErr("expected key '" + expectedKey + "' in ordered map");
+            return false;
+          }
+          entry = iter.next();
+          foundKey = entry.getKey();
+          if (skips != null && skips.contains(foundKey)) continue;
+          if (match != null && !match.contains(foundKey)) continue;
+          break;
+        }
+
+        if (!entry.getKey().equals(expectedKey)) {
+          popPath();
+          setErr(
+              "expected key '" + expectedKey + "' instead of '" + entry.getKey()
+                  + "' in ordered map");
+          return false;
+        }
+        val = entry.getValue();
+      } else {
+        if (skips != null && skips.contains(expectedKey)) continue;
+        val = v.get(expectedKey);
+      }
+
+      if (!match()) return false;
+    }
+
+    popPath();
+
+    // now check if there were any extra keys in the value (as long as there wasn't a specific list to include)
+    if (match == null) {
+      int skipped = 0;
+      if (skips != null) {
+        for (String skipStr : skips)
+          if (v.containsKey(skipStr)) skipped++;
+      }
+      if (numExpected != (v.size() - skipped)) {
+        HashSet<String> set = new HashSet<>(v.keySet());
+        set.removeAll(expectedMap.keySet());
+        setErr("unexpected map keys " + set);
+        return false;
+      }
+    }
+
+    return true;
+  }
+
+  public boolean seek(String seekPath) {
+    if (path == null) return true;
+    if (seekPath.startsWith("/")) {
+      seekPath = seekPath.substring(1);
+    }
+    if (seekPath.endsWith("/")) {
+      seekPath = seekPath.substring(0, seekPath.length() - 1);
+    }
+    List<String> pathList = StrUtils.splitSmart(seekPath, "/", false);
+    return seek(pathList);
+  }
+
+  List asList() {
+    // TODO: handle native arrays
+    if (val instanceof List) {
+      return (List) val;
+    }
+    setErr("expected List");
+    return null;
+  }
+
+  Map<String,Object> asMap() {
+    // TODO: handle NamedList
+    if (val instanceof Map) {
+      return (Map<String,Object>) val;
+    }
+    setErr("expected Map");
+    return null;
+  }
+
+  public boolean seek(List<String> seekPath) {
+    if (seekPath.size() == 0) return true;
+    String seg = seekPath.get(0);
+
+    if (seg.charAt(0) == '[') {
+      List listVal = asList();
+      if (listVal == null) return false;
+
+      int arrIdx = Integer.parseInt(seg.substring(1, seg.length() - 1));
+
+      if (arrIdx >= listVal.size()) return false;
+
+      val = listVal.get(arrIdx);
+      pushPath(arrIdx);
+    } else {
+      Map<String,Object> mapVal = asMap();
+      if (mapVal == null) return false;
+
+      // use containsKey rather than get to handle null values
+      if (!mapVal.containsKey(seg)) return false;
+
+      val = mapVal.get(seg);
+      pushPath(seg);
+    }
+
+    // recurse after removing head of the path
+    return seek(seekPath.subList(1, seekPath.size()));
+  }
+
+}
diff --git a/solr/test-framework/src/java/org/apache/solr/JSONTestUtil.java b/solr/test-framework/src/java/org/apache/solr/JSONTestUtil.java
index cc67bc0..852cee0 100644
--- a/solr/test-framework/src/java/org/apache/solr/JSONTestUtil.java
+++ b/solr/test-framework/src/java/org/apache/solr/JSONTestUtil.java
@@ -133,317 +133,3 @@ public class JSONTestUtil {
 }
 
 
-/** Tests simple object graphs, like those generated by the noggit JSON parser */
-class CollectionTester {
-  public Object valRoot;
-  public Object val;
-  public Object expectedRoot;
-  public Object expected;
-  public double delta;
-  public List<Object> path;
-  public String err;
-
-  public CollectionTester(Object val, double delta) {
-    this.val = val;
-    this.valRoot = val;
-    this.delta = delta;
-    path = new ArrayList<>();
-  }
-  public CollectionTester(Object val) {
-    this(val, JSONTestUtil.DEFAULT_DELTA);
-  }
-
-  public String getPath() {
-    StringBuilder sb = new StringBuilder();
-    boolean first=true;
-    for (Object seg : path) {
-      if (seg==null) break;
-      if (!first) sb.append('/');
-      else first=false;
-
-      if (seg instanceof Integer) {
-        sb.append('[');
-        sb.append(seg);
-        sb.append(']');
-      } else {
-        sb.append(seg.toString());
-      }
-    }
-    return sb.toString();
-  }
-
-  void setPath(Object lastSeg) {
-    path.set(path.size()-1, lastSeg);
-  }
-  Object popPath() {
-    return path.remove(path.size()-1);
-  }
-  void pushPath(Object lastSeg) {
-    path.add(lastSeg);
-  }
-
-  void setErr(String msg) {
-    err = msg;
-  }
-
-  public boolean match(Object expected) {
-    this.expectedRoot = expected;
-    this.expected = expected;
-    return match();
-  }
-
-  boolean match() {
-    if (expected == val) {
-      return true;
-    }
-    if (expected == null || val == null) {
-      setErr("mismatch: '" + expected + "'!='" + val + "'");
-      return false;
-    }
-    if (expected instanceof List) {
-      return matchList();
-    }
-    if (expected instanceof Map) {
-      return matchMap();
-    }
-
-    // generic fallback
-    if (!expected.equals(val)) {
-
-      if (expected instanceof String) {
-        String str = (String)expected;
-        if (str.length() > 6 && str.startsWith("///") && str.endsWith("///")) {
-          return handleSpecialString(str);
-        }
-      }
-
-      // make an exception for some numerics
-      if ((expected instanceof Integer && val instanceof Long || expected instanceof Long && val instanceof Integer)
-          && ((Number)expected).longValue() == ((Number)val).longValue()) {
-        return true;
-      } else if ((expected instanceof Double || expected instanceof Float) && (val instanceof Double || val instanceof Float)) {
-        double a = ((Number)expected).doubleValue();
-        double b = ((Number)val).doubleValue();
-        if (Double.compare(a,b) == 0) return true;
-        if (Math.abs(a-b) < delta) return true;
-      }
-      setErr("mismatch: '" + expected + "'!='" + val + "'");
-      return false;
-    }
-
-    // setErr("unknown expected type " + expected.getClass().getName());
-    return true;
-  }
-
-  private boolean handleSpecialString(String str) {
-    String code = str.substring(3,str.length()-3);
-    if ("ignore".equals(code)) {
-      return true;
-    } else if (code.startsWith("regex:")) {
-      String regex = code.substring("regex:".length());
-      if (!(val instanceof String)) {
-        setErr("mismatch: '" + expected + "'!='" + val + "', value is not a string");
-        return false;
-      }
-      Pattern pattern = Pattern.compile(regex);
-      Matcher matcher = pattern.matcher((String)val);
-      if (matcher.find()) {
-        return true;
-      }
-      setErr("mismatch: '" + expected + "'!='" + val + "', regex does not match");
-      return false;
-    }
-
-    setErr("mismatch: '" + expected + "'!='" + val + "'");
-    return false;
-  }
-
-  boolean matchList() {
-    List expectedList = (List)expected;
-    List v = asList();
-    if (v == null) return false;
-    int a = 0;
-    int b = 0;
-    pushPath(null);
-    for (;;) {
-      if (a >= expectedList.size() &&  b >=v.size()) {
-        break;
-      }
-
-      if (a >= expectedList.size() || b >=v.size()) {
-        popPath();
-        setErr("List size mismatch");
-        return false;
-      }
-
-      expected = expectedList.get(a);
-      val = v.get(b);
-      setPath(b);
-      if (!match()) return false;
-
-      a++; b++;
-    }
-    
-    popPath();
-    return true;
-  }
-
-  private static Set<String> reserved = new HashSet<>(Arrays.asList("_SKIP_","_MATCH_","_ORDERED_","_UNORDERED_"));
-
-  boolean matchMap() {
-    Map<String,Object> expectedMap = (Map<String,Object>)expected;
-    Map<String,Object> v = asMap();
-    if (v == null) return false;
-
-    boolean ordered = false;
-    String skipList = (String)expectedMap.get("_SKIP_");
-    String matchList = (String)expectedMap.get("_MATCH_");
-    Object orderedStr = expectedMap.get("_ORDERED_");
-    Object unorderedStr = expectedMap.get("_UNORDERED_");
-
-    if (orderedStr != null) ordered = true;
-    if (unorderedStr != null) ordered = false;
-
-    Set<String> match = null;
-    if (matchList != null) {
-      match = new HashSet(StrUtils.splitSmart(matchList,",",false));
-    }
-
-    Set<String> skips = null;
-    if (skipList != null) {
-      skips = new HashSet(StrUtils.splitSmart(skipList,",",false));
-    }
-
-    Set<String> keys = match != null ? match : expectedMap.keySet();
-    Set<String> visited = new HashSet<>();
-
-    Iterator<Map.Entry<String,Object>> iter = ordered ? v.entrySet().iterator() : null;
-
-    int numExpected=0;
-
-    pushPath(null);
-    for (String expectedKey : keys) {
-      if (reserved.contains(expectedKey)) continue;
-      numExpected++;
-
-      setPath(expectedKey);
-      if (!v.containsKey(expectedKey)) {
-        popPath();
-        setErr("expected key '" + expectedKey + "'");
-        return false;
-      }
-
-      expected = expectedMap.get(expectedKey);
-
-      if (ordered) {
-        Map.Entry<String,Object> entry;
-        String foundKey;
-        for(;;) {
-          if (!iter.hasNext()) {
-            popPath();
-            setErr("expected key '" + expectedKey + "' in ordered map");
-            return false;           
-          }
-          entry = iter.next();
-          foundKey = entry.getKey();
-          if (skips != null && skips.contains(foundKey))continue;
-          if (match != null && !match.contains(foundKey)) continue;
-          break;
-        }
-
-        if (!entry.getKey().equals(expectedKey)) {
-          popPath();          
-          setErr("expected key '" + expectedKey + "' instead of '"+entry.getKey()+"' in ordered map");
-          return false;
-        }
-        val = entry.getValue();
-      } else {
-        if (skips != null && skips.contains(expectedKey)) continue;
-        val = v.get(expectedKey);
-      }
-
-      if (!match()) return false;
-    }
-
-    popPath();
-
-    // now check if there were any extra keys in the value (as long as there wasn't a specific list to include)
-    if (match == null) {
-      int skipped = 0;
-      if (skips != null) {
-        for (String skipStr : skips)
-          if (v.containsKey(skipStr)) skipped++;
-      }
-      if (numExpected != (v.size() - skipped)) {
-        HashSet<String> set = new HashSet<>(v.keySet());
-        set.removeAll(expectedMap.keySet());
-        setErr("unexpected map keys " + set); 
-        return false;
-      }
-    }
-
-    return true;
-  }
-
-  public boolean seek(String seekPath) {
-    if (path == null) return true;
-    if (seekPath.startsWith("/")) {
-      seekPath = seekPath.substring(1);
-    }
-    if (seekPath.endsWith("/")) {
-      seekPath = seekPath.substring(0,seekPath.length()-1);
-    }
-    List<String> pathList = StrUtils.splitSmart(seekPath, "/", false);
-    return seek(pathList);
-  }
-
-  List asList() {
-    // TODO: handle native arrays
-    if (val instanceof List) {
-      return (List)val;
-    }
-    setErr("expected List");
-    return null;
-  }
-  
-  Map<String,Object> asMap() {
-    // TODO: handle NamedList
-    if (val instanceof Map) {
-      return (Map<String,Object>)val;
-    }
-    setErr("expected Map");
-    return null;
-  }
-
-  public boolean seek(List<String> seekPath) {
-    if (seekPath.size() == 0) return true;
-    String seg = seekPath.get(0);
-
-    if (seg.charAt(0)=='[') {
-      List listVal = asList();
-      if (listVal==null) return false;
-
-      int arrIdx = Integer.parseInt(seg.substring(1, seg.length()-1));
-
-      if (arrIdx >= listVal.size()) return false;
-
-      val = listVal.get(arrIdx);
-      pushPath(arrIdx);
-    } else {
-      Map<String,Object> mapVal = asMap();
-      if (mapVal==null) return false;
-
-      // use containsKey rather than get to handle null values
-      if (!mapVal.containsKey(seg)) return false;
-
-      val = mapVal.get(seg);
-      pushPath(seg);
-    }
-
-    // recurse after removing head of the path
-    return seek(seekPath.subList(1,seekPath.size()));
-  }
-
-
-
-}