HDFS-2134. Move DecommissionManager to the blockmanagement package.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1145393 13f79535-47bb-0310-9956-ffa450edef68

hdfs/CHANGES.txt

@@ -543,6 +543,9 @@ Trunk (unreleased changes)
     HDFS-2111. Add tests for ensuring that the DN will start with a few bad
     data directories. (Harsh J Chouraria via todd)
 
+    HDFS-2134. Move DecommissionManager to the blockmanagement package.
+    (szetszwo)
+
   OPTIMIZATIONS
 
     HDFS-1458. Improve checkpoint performance by avoiding unnecessary image

hdfs/src/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java

@@ -99,6 +99,8 @@ public class BlockManager {
    */
   public final BlocksMap blocksMap;
 
+  private final DatanodeManager datanodeManager;
+
   //
   // Store blocks-->datanodedescriptor(s) map of corrupt replicas
   //
@@ -164,6 +166,7 @@ public class BlockManager {
       DFSConfigKeys.DFS_NAMENODE_REPLICATION_PENDING_TIMEOUT_SEC_DEFAULT) * 1000L);
     setConfigurationParameters(conf);
     blocksMap = new BlocksMap(capacity, DEFAULT_MAP_LOAD_FACTOR);
+    datanodeManager = new DatanodeManager(fsn);
   }
 
   void setConfigurationParameters(Configuration conf) throws IOException {
@@ -207,13 +210,15 @@ public class BlockManager {
     FSNamesystem.LOG.info("shouldCheckForEnoughRacks = " + shouldCheckForEnoughRacks);
   }
 
-  public void activate() {
+  public void activate(Configuration conf) {
     pendingReplications.start();
+    datanodeManager.activate(conf);
   }
 
   public void close() {
     if (pendingReplications != null) pendingReplications.stop();
     blocksMap.close();
+    datanodeManager.close();
   }
 
   public void metaSave(PrintWriter out) {

hdfs/src/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java

@@ -0,0 +1,57 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hdfs.server.blockmanagement;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hdfs.DFSConfigKeys;
+import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
+import org.apache.hadoop.util.Daemon;
+
+/**
+ * Manage datanodes, include decommission and other activities.
+ */
+@InterfaceAudience.Private
+@InterfaceStability.Evolving
+public class DatanodeManager {
+  static final Log LOG = LogFactory.getLog(DatanodeManager.class);
+
+  final FSNamesystem namesystem;
+  
+  DatanodeManager(final FSNamesystem namesystem) {
+    this.namesystem = namesystem;
+  }
+
+  private Daemon decommissionthread = null;
+
+  void activate(final Configuration conf) {
+    this.decommissionthread = new Daemon(new DecommissionManager(namesystem).new Monitor(
+        conf.getInt(DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_INTERVAL_KEY, 
+                    DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_INTERVAL_DEFAULT),
+        conf.getInt(DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_NODES_PER_INTERVAL_KEY, 
+                    DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_NODES_PER_INTERVAL_DEFAULT)));
+    decommissionthread.start();
+  }
+
+  void close() {
+    if (decommissionthread != null) decommissionthread.interrupt();
+  }
+}

hdfs/src/java/org/apache/hadoop/hdfs/server/namenode/DecommissionManager.java → hdfs/src/java/org/apache/hadoop/hdfs/server/blockmanagement/DecommissionManager.java

@@ -15,18 +15,22 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.hdfs.server.namenode;
+package org.apache.hadoop.hdfs.server.blockmanagement;
 
 import java.util.Map;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
 import org.apache.hadoop.util.CyclicIteration;
 
 /**
  * Manage node decommissioning.
  */
+@InterfaceAudience.Private
+@InterfaceStability.Evolving
 class DecommissionManager {
   static final Log LOG = LogFactory.getLog(DecommissionManager.class);
 
@@ -56,6 +60,7 @@ class DecommissionManager {
      * Check decommission status of numNodesPerCheck nodes
      * for every recheckInterval milliseconds.
      */
+    @Override
     public void run() {
       for(; fsnamesystem.isRunning(); ) {
         fsnamesystem.writeLock();

hdfs/src/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java

@@ -266,7 +266,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
    * <p>
    * Mapping: StorageID -> DatanodeDescriptor
    */
-  NavigableMap<String, DatanodeDescriptor> datanodeMap = 
+  public final NavigableMap<String, DatanodeDescriptor> datanodeMap = 
     new TreeMap<String, DatanodeDescriptor>();
 
   Random r = new Random();
@@ -324,7 +324,6 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
   private DNSToSwitchMapping dnsToSwitchMapping;
 
   private HostsFileReader hostsReader; 
-  private Daemon dnthread = null;
 
   private long maxFsObjects = 0;          // maximum number of fs objects
 
@@ -404,7 +403,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
    */
   void activate(Configuration conf) throws IOException {
     setBlockTotal();
-    blockManager.activate();
+    blockManager.activate(conf);
     this.hbthread = new Daemon(new HeartbeatMonitor());
     this.lmthread = new Daemon(leaseManager.new Monitor());
     this.replthread = new Daemon(new ReplicationMonitor());
@@ -415,13 +414,6 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
     this.nnrmthread = new Daemon(new NameNodeResourceMonitor());
     nnrmthread.start();
 
-    this.dnthread = new Daemon(new DecommissionManager(this).new Monitor(
-        conf.getInt(DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_INTERVAL_KEY, 
-                    DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_INTERVAL_DEFAULT),
-        conf.getInt(DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_NODES_PER_INTERVAL_KEY, 
-                    DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_NODES_PER_INTERVAL_DEFAULT)));
-    dnthread.start();
-
     this.dnsToSwitchMapping = ReflectionUtils.newInstance(
         conf.getClass(DFSConfigKeys.NET_TOPOLOGY_NODE_SWITCH_MAPPING_IMPL_KEY, 
                       ScriptBasedMapping.class,
@@ -636,7 +628,6 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
       if (blockManager != null) blockManager.close();
       if (hbthread != null) hbthread.interrupt();
       if (replthread != null) replthread.interrupt();
-      if (dnthread != null) dnthread.interrupt();
       if (smmthread != null) smmthread.interrupt();
       if (dtSecretManager != null) dtSecretManager.stopThreads();
       if (nnrmthread != null) nnrmthread.interrupt();
@@ -661,7 +652,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
   }
 
   /** Is this name system running? */
-  boolean isRunning() {
+  public boolean isRunning() {
     return fsRunning;
   }
 
@@ -3988,7 +3979,7 @@ public class FSNamesystem implements FSConstants, FSNamesystemMBean,
    * Change, if appropriate, the admin state of a datanode to 
    * decommission completed. Return true if decommission is complete.
    */
-  boolean checkDecommissionStateInternal(DatanodeDescriptor node) {
+  public boolean checkDecommissionStateInternal(DatanodeDescriptor node) {
     assert hasWriteLock();
     //
     // Check to see if all blocks in this decommissioned