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Posted to commits@cassandra.apache.org by al...@apache.org on 2015/07/01 18:44:18 UTC

cassandra git commit: Change hinted_handoff_enabled yaml setting, JMX

Repository: cassandra
Updated Branches:
  refs/heads/trunk 87c4eb2d3 -> e89d54865


Change hinted_handoff_enabled yaml setting, JMX

patch by Stefania Alborghetti; reviewed by Aleksey Yeschenko for
CASSANDRA-9035


Project: http://git-wip-us.apache.org/repos/asf/cassandra/repo
Commit: http://git-wip-us.apache.org/repos/asf/cassandra/commit/e89d5486
Tree: http://git-wip-us.apache.org/repos/asf/cassandra/tree/e89d5486
Diff: http://git-wip-us.apache.org/repos/asf/cassandra/diff/e89d5486

Branch: refs/heads/trunk
Commit: e89d54865ed9e69cb2b0081559936d1d2ee9b7c7
Parents: 87c4eb2
Author: Stefania Alborghetti <st...@datastax.com>
Authored: Mon Jun 22 17:42:37 2015 +0800
Committer: Aleksey Yeschenko <al...@apache.org>
Committed: Wed Jul 1 19:43:33 2015 +0300

----------------------------------------------------------------------
 CHANGES.txt                                     |   1 +
 NEWS.txt                                        |   4 +-
 build.xml                                       |   6 +-
 conf/cassandra.yaml                             |   9 +-
 lib/licenses/super-csv-2.1.0.txt                | 202 -------------------
 .../org/apache/cassandra/config/Config.java     |  48 +----
 .../cassandra/config/DatabaseDescriptor.java    |  36 +---
 .../cassandra/config/ParameterizedClass.java    |   4 +-
 .../config/YamlConfigurationLoader.java         |  47 ++++-
 .../apache/cassandra/service/StorageProxy.java  |  37 ++--
 .../cassandra/service/StorageProxyMBean.java    |   5 +-
 .../org/apache/cassandra/tools/NodeProbe.java   |  14 +-
 .../org/apache/cassandra/tools/NodeTool.java    |   4 +-
 .../tools/nodetool/DisableHintsForDC.java       |  42 ++++
 .../cassandra/tools/nodetool/EnableHandoff.java |  16 +-
 .../tools/nodetool/EnableHintsForDC.java        |  42 ++++
 .../cassandra/tools/nodetool/StatusHandoff.java |   7 +-
 .../config/DatabaseDescriptorTest.java          |   2 +-
 18 files changed, 198 insertions(+), 328 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/cassandra/blob/e89d5486/CHANGES.txt
----------------------------------------------------------------------
diff --git a/CHANGES.txt b/CHANGES.txt
index cbe2cca..ac23818 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,4 +1,5 @@
 3.0
+ * Change hinted_handoff_enabled yaml setting, JMX (CASSANDRA-9035)
  * Add algorithmic token allocation (CASSANDRA-7032)
  * Add nodetool command to replay batchlog (CASSANDRA-9547)
  * Make file buffer cache independent of paths being read (CASSANDRA-8897)

http://git-wip-us.apache.org/repos/asf/cassandra/blob/e89d5486/NEWS.txt
----------------------------------------------------------------------
diff --git a/NEWS.txt b/NEWS.txt
index b664e6a..3a9fe6a 100644
--- a/NEWS.txt
+++ b/NEWS.txt
@@ -25,7 +25,9 @@ Upgrading
      use CqlInputFormat and CqlOutputFormat instead.
    - Hadoop ColumnFamilyRecordReader and ColumnFamilyRecordWriter have been removed;
      use CqlRecordReader and CqlRecordWriter instead.
-
+   - hinted_handoff_enabled in cassandra.yaml no longer supports a list of data centers.
+     To specify a list of excluded data centers when hinted_handoff_enabled is set to true,
+     use hinted_handoff_disabled_datacenters, see CASSANDRA-9035 for details.
 
 2.2
 ===

http://git-wip-us.apache.org/repos/asf/cassandra/blob/e89d5486/build.xml
----------------------------------------------------------------------
diff --git a/build.xml b/build.xml
index 7c05d7f..a61913b 100644
--- a/build.xml
+++ b/build.xml
@@ -404,13 +404,12 @@
           -->
           <dependency groupId="org.eclipse.jdt.core.compiler" artifactId="ecj" version="4.4.2" />
           <dependency groupId="org.caffinitas.ohc" artifactId="ohc-core" version="0.3.4" />
-          <dependency groupId="net.sf.supercsv" artifactId="super-csv" version="2.1.0" />
-	      <dependency groupId="net.ju-n.compile-command-annotations" artifactId="compile-command-annotations" version="1.2.0" />
+          <dependency groupId="net.ju-n.compile-command-annotations" artifactId="compile-command-annotations" version="1.2.0" />
           <dependency groupId="org.fusesource" artifactId="sigar" version="1.6.4">
           	<exclusion groupId="log4j" artifactId="log4j"/>
           </dependency>
           <dependency groupId="joda-time" artifactId="joda-time" version="2.4" />
-        	
+
         </dependencyManagement>
         <developer id="alakshman" name="Avinash Lakshman"/>
         <developer id="aleksey" name="Aleksey Yeschenko"/>
@@ -517,7 +516,6 @@
         <dependency groupId="com.addthis.metrics" artifactId="reporter-config3"/>
         <dependency groupId="com.thinkaurelius.thrift" artifactId="thrift-server" version="0.3.5"/>
         <dependency groupId="com.clearspring.analytics" artifactId="stream" version="2.5.2" />
-        <dependency groupId="net.sf.supercsv" artifactId="super-csv" version="2.1.0" />
 
         <dependency groupId="ch.qos.logback" artifactId="logback-core"/>
         <dependency groupId="ch.qos.logback" artifactId="logback-classic"/>

http://git-wip-us.apache.org/repos/asf/cassandra/blob/e89d5486/conf/cassandra.yaml
----------------------------------------------------------------------
diff --git a/conf/cassandra.yaml b/conf/cassandra.yaml
index 71e0a81..dc9a7ea 100644
--- a/conf/cassandra.yaml
+++ b/conf/cassandra.yaml
@@ -42,10 +42,13 @@ num_tokens: 256
 # initial_token:
 
 # See http://wiki.apache.org/cassandra/HintedHandoff
-# May either be "true" or "false" to enable globally, or contain a list
-# of data centers to enable per-datacenter.
-# hinted_handoff_enabled: DC1,DC2
+# May either be "true" or "false" to enable globally
 hinted_handoff_enabled: true
+# When hinted_handoff_enabled is true, a black list of data centers that will not
+# perform hinted handoff
+#hinted_handoff_disabled_datacenters:
+#    - DC1
+#    - DC2
 # this defines the maximum amount of time a dead host will have hints
 # generated.  After it has been dead this long, new hints for it will not be
 # created until it has been seen alive and gone down again.

http://git-wip-us.apache.org/repos/asf/cassandra/blob/e89d5486/lib/licenses/super-csv-2.1.0.txt
----------------------------------------------------------------------
diff --git a/lib/licenses/super-csv-2.1.0.txt b/lib/licenses/super-csv-2.1.0.txt
deleted file mode 100644
index d645695..0000000
--- a/lib/licenses/super-csv-2.1.0.txt
+++ /dev/null
@@ -1,202 +0,0 @@
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http://git-wip-us.apache.org/repos/asf/cassandra/blob/e89d5486/src/java/org/apache/cassandra/config/Config.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/config/Config.java b/src/java/org/apache/cassandra/config/Config.java
index 54005e9..a1104e5 100644
--- a/src/java/org/apache/cassandra/config/Config.java
+++ b/src/java/org/apache/cassandra/config/Config.java
@@ -17,9 +17,6 @@
  */
 package org.apache.cassandra.config;
 
-import java.io.IOException;
-import java.io.StringReader;
-import java.util.List;
 import java.util.Set;
 import java.util.concurrent.TimeUnit;
 
@@ -27,9 +24,6 @@ import com.google.common.collect.Sets;
 
 import org.apache.cassandra.config.EncryptionOptions.ClientEncryptionOptions;
 import org.apache.cassandra.config.EncryptionOptions.ServerEncryptionOptions;
-import org.apache.cassandra.exceptions.ConfigurationException;
-import org.supercsv.io.CsvListReader;
-import org.supercsv.prefs.CsvPreference;
 
 /**
  * A class that contains configuration properties for the cassandra node it runs within.
@@ -59,9 +53,8 @@ public class Config
     public String partitioner;
 
     public Boolean auto_bootstrap = true;
-    public volatile boolean hinted_handoff_enabled_global = true;
-    public String hinted_handoff_enabled;
-    public Set<String> hinted_handoff_enabled_by_dc = Sets.newConcurrentHashSet();
+    public volatile boolean hinted_handoff_enabled = true;
+    public Set<String> hinted_handoff_disabled_datacenters = Sets.newConcurrentHashSet();
     public volatile Integer max_hint_window_in_ms = 3 * 3600 * 1000; // three hours
 
     public ParameterizedClass seed_provider;
@@ -240,9 +233,6 @@ public class Config
     public volatile Long index_summary_capacity_in_mb;
     public volatile int index_summary_resize_interval_in_minutes = 60;
 
-    private static final CsvPreference STANDARD_SURROUNDING_SPACES_NEED_QUOTES = new CsvPreference.Builder(CsvPreference.STANDARD_PREFERENCE)
-                                                                                                  .surroundingSpacesNeedQuotes(true).build();
-
     // TTL for different types of trace events.
     public int tracetype_query_ttl = (int) TimeUnit.DAYS.toSeconds(1);
     public int tracetype_repair_ttl = (int) TimeUnit.DAYS.toSeconds(7);
@@ -287,40 +277,6 @@ public class Config
         isClientMode = clientMode;
     }
 
-    public void configHintedHandoff() throws ConfigurationException
-    {
-        if (hinted_handoff_enabled != null && !hinted_handoff_enabled.isEmpty())
-        {
-            if (hinted_handoff_enabled.equalsIgnoreCase("true"))
-            {
-                hinted_handoff_enabled_global = true;
-            }
-            else if (hinted_handoff_enabled.equalsIgnoreCase("false"))
-            {
-                hinted_handoff_enabled_global = false;
-            }
-            else
-            {
-                try
-                {
-                    hinted_handoff_enabled_by_dc.addAll(parseHintedHandoffEnabledDCs(hinted_handoff_enabled));
-                }
-                catch (IOException e)
-                {
-                    throw new ConfigurationException("Invalid hinted_handoff_enabled parameter " + hinted_handoff_enabled, e);
-                }
-            }
-        }
-    }
-
-    public static List<String> parseHintedHandoffEnabledDCs(final String dcNames) throws IOException
-    {
-        try (final CsvListReader csvListReader = new CsvListReader(new StringReader(dcNames), STANDARD_SURROUNDING_SPACES_NEED_QUOTES))
-        {
-        	return csvListReader.read();
-        }
-    }
-
     public static enum CommitLogSync
     {
         periodic,

http://git-wip-us.apache.org/repos/asf/cassandra/blob/e89d5486/src/java/org/apache/cassandra/config/DatabaseDescriptor.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/config/DatabaseDescriptor.java b/src/java/org/apache/cassandra/config/DatabaseDescriptor.java
index f0dda09..47d81ab 100644
--- a/src/java/org/apache/cassandra/config/DatabaseDescriptor.java
+++ b/src/java/org/apache/cassandra/config/DatabaseDescriptor.java
@@ -1358,47 +1358,27 @@ public class DatabaseDescriptor
 
     public static void setHintedHandoffEnabled(boolean hintedHandoffEnabled)
     {
-        conf.hinted_handoff_enabled_global = hintedHandoffEnabled;
-        conf.hinted_handoff_enabled_by_dc.clear();
-    }
-
-    public static void setHintedHandoffEnabled(final String dcNames)
-    {
-        List<String> dcNameList;
-        try
-        {
-            dcNameList = Config.parseHintedHandoffEnabledDCs(dcNames);
-        }
-        catch (IOException e)
-        {
-            throw new IllegalArgumentException("Could not read csv of dcs for hinted handoff enable. " + dcNames, e);
-        }
-
-        if (dcNameList.isEmpty())
-            throw new IllegalArgumentException("Empty list of Dcs for hinted handoff enable");
-
-        conf.hinted_handoff_enabled_by_dc.clear();
-        conf.hinted_handoff_enabled_by_dc.addAll(dcNameList);
+        conf.hinted_handoff_enabled = hintedHandoffEnabled;
     }
 
     public static boolean hintedHandoffEnabled()
     {
-        return conf.hinted_handoff_enabled_global;
+        return conf.hinted_handoff_enabled;
     }
 
-    public static Set<String> hintedHandoffEnabledByDC()
+    public static Set<String> hintedHandoffDisabledDCs()
     {
-        return Collections.unmodifiableSet(conf.hinted_handoff_enabled_by_dc);
+        return conf.hinted_handoff_disabled_datacenters;
     }
 
-    public static boolean shouldHintByDC()
+    public static void enableHintsForDC(String dc)
     {
-        return !conf.hinted_handoff_enabled_by_dc.isEmpty();
+        conf.hinted_handoff_disabled_datacenters.remove(dc);
     }
 
-    public static boolean hintedHandoffEnabled(final String dcName)
+    public static void disableHintsForDC(String dc)
     {
-        return conf.hinted_handoff_enabled_by_dc.contains(dcName);
+        conf.hinted_handoff_disabled_datacenters.add(dc);
     }
 
     public static void setMaxHintWindow(int ms)

http://git-wip-us.apache.org/repos/asf/cassandra/blob/e89d5486/src/java/org/apache/cassandra/config/ParameterizedClass.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/config/ParameterizedClass.java b/src/java/org/apache/cassandra/config/ParameterizedClass.java
index 6b7af63..c7614de 100644
--- a/src/java/org/apache/cassandra/config/ParameterizedClass.java
+++ b/src/java/org/apache/cassandra/config/ParameterizedClass.java
@@ -35,10 +35,10 @@ public class ParameterizedClass
     }
 
     @SuppressWarnings("unchecked")
-    public ParameterizedClass(LinkedHashMap<String, ?> p)
+    public ParameterizedClass(Map<String, ?> p)
     {
         this((String)p.get("class_name"),
-                p.containsKey("parameters") ? (Map<String, String>)((List<?>)p.get("parameters")).get(0) : null);
+             p.containsKey("parameters") ? (Map<String, String>)((List<?>)p.get("parameters")).get(0) : null);
     }
 
     @Override

http://git-wip-us.apache.org/repos/asf/cassandra/blob/e89d5486/src/java/org/apache/cassandra/config/YamlConfigurationLoader.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/config/YamlConfigurationLoader.java b/src/java/org/apache/cassandra/config/YamlConfigurationLoader.java
index 062f64d..d2a50e7 100644
--- a/src/java/org/apache/cassandra/config/YamlConfigurationLoader.java
+++ b/src/java/org/apache/cassandra/config/YamlConfigurationLoader.java
@@ -24,11 +24,15 @@ import java.io.InputStream;
 import java.io.IOException;
 import java.net.URL;
 import java.util.HashSet;
+import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.TreeMap;
 
 import com.google.common.base.Joiner;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Sets;
 import com.google.common.io.ByteStreams;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -36,6 +40,7 @@ import org.slf4j.LoggerFactory;
 import org.apache.cassandra.exceptions.ConfigurationException;
 import org.yaml.snakeyaml.TypeDescription;
 import org.yaml.snakeyaml.Yaml;
+import org.yaml.snakeyaml.constructor.Constructor;
 import org.yaml.snakeyaml.error.YAMLException;
 import org.yaml.snakeyaml.introspector.MissingProperty;
 import org.yaml.snakeyaml.introspector.Property;
@@ -106,15 +111,11 @@ public class YamlConfigurationLoader implements ConfigurationLoader
 
             logConfig(configBytes);
 
-            org.yaml.snakeyaml.constructor.Constructor constructor = new org.yaml.snakeyaml.constructor.Constructor(Config.class);
-            TypeDescription seedDesc = new TypeDescription(ParameterizedClass.class);
-            seedDesc.putMapPropertyType("parameters", String.class, String.class);
-            constructor.addTypeDescription(seedDesc);
+            Constructor constructor = new CustomConstructor(Config.class);
             MissingPropertiesChecker propertiesChecker = new MissingPropertiesChecker();
             constructor.setPropertyUtils(propertiesChecker);
             Yaml yaml = new Yaml(constructor);
             Config result = yaml.loadAs(new ByteArrayInputStream(configBytes), Config.class);
-            result.configHintedHandoff();
             propertiesChecker.check();
             return result;
         }
@@ -124,6 +125,42 @@ public class YamlConfigurationLoader implements ConfigurationLoader
         }
     }
 
+    static class CustomConstructor extends Constructor
+    {
+        CustomConstructor(Class<?> theRoot)
+        {
+            super(theRoot);
+
+            TypeDescription seedDesc = new TypeDescription(ParameterizedClass.class);
+            seedDesc.putMapPropertyType("parameters", String.class, String.class);
+            addTypeDescription(seedDesc);
+        }
+
+        @Override
+        protected List<Object> createDefaultList(int initSize)
+        {
+            return Lists.newCopyOnWriteArrayList();
+        }
+
+        @Override
+        protected Map<Object, Object> createDefaultMap()
+        {
+            return Maps.newConcurrentMap();
+        }
+
+        @Override
+        protected Set<Object> createDefaultSet(int initSize)
+        {
+            return Sets.newConcurrentHashSet();
+        }
+
+        @Override
+        protected Set<Object> createDefaultSet()
+        {
+            return Sets.newConcurrentHashSet();
+        }
+    }
+
     private void logConfig(byte[] configBytes)
     {
         Map<Object, Object> configMap = new TreeMap<>((Map<?, ?>) new Yaml().load(new ByteArrayInputStream(configBytes)));

http://git-wip-us.apache.org/repos/asf/cassandra/blob/e89d5486/src/java/org/apache/cassandra/service/StorageProxy.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/service/StorageProxy.java b/src/java/org/apache/cassandra/service/StorageProxy.java
index 17a9c11..22831ca 100644
--- a/src/java/org/apache/cassandra/service/StorageProxy.java
+++ b/src/java/org/apache/cassandra/service/StorageProxy.java
@@ -2003,19 +2003,24 @@ public class StorageProxy implements StorageProxyMBean
         return DatabaseDescriptor.hintedHandoffEnabled();
     }
 
-    public Set<String> getHintedHandoffEnabledByDC()
+    public void setHintedHandoffEnabled(boolean b)
     {
-        return DatabaseDescriptor.hintedHandoffEnabledByDC();
+        DatabaseDescriptor.setHintedHandoffEnabled(b);
     }
 
-    public void setHintedHandoffEnabled(boolean b)
+    public void enableHintsForDC(String dc)
     {
-        DatabaseDescriptor.setHintedHandoffEnabled(b);
+        DatabaseDescriptor.enableHintsForDC(dc);
     }
 
-    public void setHintedHandoffEnabledByDCList(String dcNames)
+    public void disableHintsForDC(String dc)
     {
-        DatabaseDescriptor.setHintedHandoffEnabled(dcNames);
+        DatabaseDescriptor.disableHintsForDC(dc);
+    }
+
+    public Set<String> getHintedHandoffDisabledDCs()
+    {
+        return DatabaseDescriptor.hintedHandoffDisabledDCs();
     }
 
     public int getMaxHintWindow()
@@ -2030,27 +2035,29 @@ public class StorageProxy implements StorageProxyMBean
 
     public static boolean shouldHint(InetAddress ep)
     {
-        if (DatabaseDescriptor.shouldHintByDC())
+        if (!DatabaseDescriptor.hintedHandoffEnabled())
+        {
+            HintedHandOffManager.instance.metrics.incrPastWindow(ep);
+            return false;
+        }
+
+        Set<String> disabledDCs = DatabaseDescriptor.hintedHandoffDisabledDCs();
+        if (!disabledDCs.isEmpty())
         {
             final String dc = DatabaseDescriptor.getEndpointSnitch().getDatacenter(ep);
-            //Disable DC specific hints
-            if(!DatabaseDescriptor.hintedHandoffEnabled(dc))
+            if (disabledDCs.contains(dc))
             {
+                Tracing.trace("Not hinting {} since its data center {} has been disabled {}", ep, dc, disabledDCs);
                 HintedHandOffManager.instance.metrics.incrPastWindow(ep);
                 return false;
             }
         }
-        else if (!DatabaseDescriptor.hintedHandoffEnabled())
-        {
-            HintedHandOffManager.instance.metrics.incrPastWindow(ep);
-            return false;
-        }
 
         boolean hintWindowExpired = Gossiper.instance.getEndpointDowntime(ep) > DatabaseDescriptor.getMaxHintWindow();
         if (hintWindowExpired)
         {
             HintedHandOffManager.instance.metrics.incrPastWindow(ep);
-            Tracing.trace("Not hinting {} which has been down {}ms", ep, Gossiper.instance.getEndpointDowntime(ep));
+            Tracing.trace("Not hinting {} which has been down {} ms", ep, Gossiper.instance.getEndpointDowntime(ep));
         }
         return !hintWindowExpired;
     }

http://git-wip-us.apache.org/repos/asf/cassandra/blob/e89d5486/src/java/org/apache/cassandra/service/StorageProxyMBean.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/service/StorageProxyMBean.java b/src/java/org/apache/cassandra/service/StorageProxyMBean.java
index e619892..0db0ca6 100644
--- a/src/java/org/apache/cassandra/service/StorageProxyMBean.java
+++ b/src/java/org/apache/cassandra/service/StorageProxyMBean.java
@@ -25,9 +25,10 @@ public interface StorageProxyMBean
 {
     public long getTotalHints();
     public boolean getHintedHandoffEnabled();
-    public Set<String> getHintedHandoffEnabledByDC();
     public void setHintedHandoffEnabled(boolean b);
-    public void setHintedHandoffEnabledByDCList(String dcs);
+    public void enableHintsForDC(String dc);
+    public void disableHintsForDC(String dc);
+    public Set<String> getHintedHandoffDisabledDCs();
     public int getMaxHintWindow();
     public void setMaxHintWindow(int ms);
     public int getMaxHintsInProgress();

http://git-wip-us.apache.org/repos/asf/cassandra/blob/e89d5486/src/java/org/apache/cassandra/tools/NodeProbe.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/tools/NodeProbe.java b/src/java/org/apache/cassandra/tools/NodeProbe.java
index e9a51d1..929820d 100644
--- a/src/java/org/apache/cassandra/tools/NodeProbe.java
+++ b/src/java/org/apache/cassandra/tools/NodeProbe.java
@@ -845,9 +845,19 @@ public class NodeProbe implements AutoCloseable
         return spProxy.getHintedHandoffEnabled();
     }
 
-    public void enableHintedHandoff(String dcNames)
+    public void enableHintsForDC(String dc)
     {
-        spProxy.setHintedHandoffEnabledByDCList(dcNames);
+        spProxy.enableHintsForDC(dc);
+    }
+
+    public void disableHintsForDC(String dc)
+    {
+        spProxy.disableHintsForDC(dc);
+    }
+
+    public Set<String> getHintedHandoffDisabledDCs()
+    {
+        return spProxy.getHintedHandoffDisabledDCs();
     }
 
     public void pauseHintsDelivery()

http://git-wip-us.apache.org/repos/asf/cassandra/blob/e89d5486/src/java/org/apache/cassandra/tools/NodeTool.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/tools/NodeTool.java b/src/java/org/apache/cassandra/tools/NodeTool.java
index dc3b876..ed8b296 100644
--- a/src/java/org/apache/cassandra/tools/NodeTool.java
+++ b/src/java/org/apache/cassandra/tools/NodeTool.java
@@ -129,7 +129,9 @@ public class NodeTool
                 TpStats.class,
                 TopPartitions.class,
                 SetLoggingLevel.class,
-                GetLoggingLevels.class
+                GetLoggingLevels.class,
+                DisableHintsForDC.class,
+                EnableHintsForDC.class
         );
 
         Cli.CliBuilder<Runnable> builder = Cli.builder("nodetool");

http://git-wip-us.apache.org/repos/asf/cassandra/blob/e89d5486/src/java/org/apache/cassandra/tools/nodetool/DisableHintsForDC.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/tools/nodetool/DisableHintsForDC.java b/src/java/org/apache/cassandra/tools/nodetool/DisableHintsForDC.java
new file mode 100644
index 0000000..7072318
--- /dev/null
+++ b/src/java/org/apache/cassandra/tools/nodetool/DisableHintsForDC.java
@@ -0,0 +1,42 @@
+/*
+ * 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.cassandra.tools.nodetool;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import io.airlift.command.Arguments;
+import io.airlift.command.Command;
+import org.apache.cassandra.tools.NodeProbe;
+import org.apache.cassandra.tools.NodeTool;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+@Command(name = "disablehintsfordc", description = "Disable hints for a data center")
+public class DisableHintsForDC extends NodeTool.NodeToolCmd
+{
+    @Arguments(usage = "<datacenter>", description = "The data center to disable")
+    private List<String> args = new ArrayList<>();
+
+    public void execute(NodeProbe probe)
+    {
+        checkArgument(args.size() == 1, "disablehintsfordc requires exactly one data center");
+
+        probe.disableHintsForDC(args.get(0));
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/cassandra/blob/e89d5486/src/java/org/apache/cassandra/tools/nodetool/EnableHandoff.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/tools/nodetool/EnableHandoff.java b/src/java/org/apache/cassandra/tools/nodetool/EnableHandoff.java
index d18d77a..149c0fc 100644
--- a/src/java/org/apache/cassandra/tools/nodetool/EnableHandoff.java
+++ b/src/java/org/apache/cassandra/tools/nodetool/EnableHandoff.java
@@ -17,29 +17,17 @@
  */
 package org.apache.cassandra.tools.nodetool;
 
-import static com.google.common.base.Preconditions.checkArgument;
-import io.airlift.command.Arguments;
 import io.airlift.command.Command;
 
-import java.util.ArrayList;
-import java.util.List;
-
 import org.apache.cassandra.tools.NodeProbe;
 import org.apache.cassandra.tools.NodeTool.NodeToolCmd;
 
-@Command(name = "enablehandoff", description = "Reenable the future hints storing on the current node")
+@Command(name = "enablehandoff", description = "Reenable future hints storing on the current node")
 public class EnableHandoff extends NodeToolCmd
 {
-    @Arguments(usage = "<dc-name>,<dc-name>", description = "Enable hinted handoff only for these DCs")
-    private List<String> args = new ArrayList<>();
-
     @Override
     public void execute(NodeProbe probe)
     {
-        checkArgument(args.size() <= 1, "enablehandoff does not accept two args");
-        if(args.size() == 1)
-            probe.enableHintedHandoff(args.get(0));
-        else
-            probe.enableHintedHandoff();
+        probe.enableHintedHandoff();
     }
 }
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/cassandra/blob/e89d5486/src/java/org/apache/cassandra/tools/nodetool/EnableHintsForDC.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/tools/nodetool/EnableHintsForDC.java b/src/java/org/apache/cassandra/tools/nodetool/EnableHintsForDC.java
new file mode 100644
index 0000000..1979ebd
--- /dev/null
+++ b/src/java/org/apache/cassandra/tools/nodetool/EnableHintsForDC.java
@@ -0,0 +1,42 @@
+/*
+ * 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.cassandra.tools.nodetool;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import io.airlift.command.Arguments;
+import io.airlift.command.Command;
+import org.apache.cassandra.tools.NodeProbe;
+import org.apache.cassandra.tools.NodeTool;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+@Command(name = "enablehintsfordc", description = "Enable hints for a data center that was previsouly disabled")
+public class EnableHintsForDC extends NodeTool.NodeToolCmd
+{
+    @Arguments(usage = "<datacenter>", description = "The data center to enable")
+    private List<String> args = new ArrayList<>();
+
+    public void execute(NodeProbe probe)
+    {
+        checkArgument(args.size() == 1, "enablehintsfordc requires exactly one data center");
+
+        probe.enableHintsForDC(args.get(0));
+    }
+}

http://git-wip-us.apache.org/repos/asf/cassandra/blob/e89d5486/src/java/org/apache/cassandra/tools/nodetool/StatusHandoff.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/tools/nodetool/StatusHandoff.java b/src/java/org/apache/cassandra/tools/nodetool/StatusHandoff.java
index 5a00069..65f6729 100644
--- a/src/java/org/apache/cassandra/tools/nodetool/StatusHandoff.java
+++ b/src/java/org/apache/cassandra/tools/nodetool/StatusHandoff.java
@@ -28,9 +28,12 @@ public class StatusHandoff extends NodeToolCmd
     @Override
     public void execute(NodeProbe probe)
     {
-        System.out.println(
+        System.out.println(String.format("Hinted handoff is %s",
                 probe.isHandoffEnabled()
                 ? "running"
-                : "not running");
+                : "not running"));
+
+        for (String dc : probe.getHintedHandoffDisabledDCs())
+            System.out.println(String.format("Data center %s is disabled", dc));
     }
 }
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/cassandra/blob/e89d5486/test/unit/org/apache/cassandra/config/DatabaseDescriptorTest.java
----------------------------------------------------------------------
diff --git a/test/unit/org/apache/cassandra/config/DatabaseDescriptorTest.java b/test/unit/org/apache/cassandra/config/DatabaseDescriptorTest.java
index 100a432..5887c9a 100644
--- a/test/unit/org/apache/cassandra/config/DatabaseDescriptorTest.java
+++ b/test/unit/org/apache/cassandra/config/DatabaseDescriptorTest.java
@@ -132,7 +132,7 @@ public class DatabaseDescriptorTest
         public Config loadConfig() throws ConfigurationException
         {
             Config testConfig = new Config();
-            testConfig.cluster_name = "ConfigurationLoader Test";;
+            testConfig.cluster_name = "ConfigurationLoader Test";
             return testConfig;
         }
     }