HDFS-8591. Remove support for deprecated configuration key dfs.namenode.decommission.nodes.per.interval.

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -31,6 +31,9 @@ Trunk (Unreleased)
  
     HDFS-8135. Remove the deprecated FSConstants class. (Li Lu via wheat9)
 
+    HDFS-8591. Remove support for deprecated configuration key
+    dfs.namenode.decommission.nodes.per.interval. (wang)
+
   NEW FEATURES
 
     HDFS-3125. Add JournalService to enable Journal Daemon. (suresh)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DecommissionManager.java

@@ -136,29 +136,20 @@ public class DecommissionManager {
     checkArgument(intervalSecs >= 0, "Cannot set a negative " +
         "value for " + DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_INTERVAL_KEY);
 
-    // By default, the new configuration key overrides the deprecated one.
-    // No # node limit is set.
     int blocksPerInterval = conf.getInt(
         DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_BLOCKS_PER_INTERVAL_KEY,
         DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_BLOCKS_PER_INTERVAL_DEFAULT);
-    int nodesPerInterval = Integer.MAX_VALUE;
 
-    // If the expected key isn't present and the deprecated one is, 
-    // use the deprecated one into the new one. This overrides the 
-    // default.
-    //
-    // Also print a deprecation warning.
     final String deprecatedKey =
         "dfs.namenode.decommission.nodes.per.interval";
     final String strNodes = conf.get(deprecatedKey);
     if (strNodes != null) {
-      nodesPerInterval = Integer.parseInt(strNodes);
-      blocksPerInterval = Integer.MAX_VALUE;
-      LOG.warn("Using deprecated configuration key {} value of {}.",
-          deprecatedKey, nodesPerInterval); 
+      LOG.warn("Deprecated configuration key {} will be ignored.",
+          deprecatedKey);
       LOG.warn("Please update your configuration to use {} instead.", 
           DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_BLOCKS_PER_INTERVAL_KEY);
     }
+
     checkArgument(blocksPerInterval > 0,
         "Must set a positive value for "
         + DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_BLOCKS_PER_INTERVAL_KEY);
@@ -170,15 +161,14 @@ public class DecommissionManager {
         "value for "
         + DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_MAX_CONCURRENT_TRACKED_NODES);
 
-    monitor = new Monitor(blocksPerInterval, 
-        nodesPerInterval, maxConcurrentTrackedNodes);
+    monitor = new Monitor(blocksPerInterval, maxConcurrentTrackedNodes);
     executor.scheduleAtFixedRate(monitor, intervalSecs, intervalSecs,
         TimeUnit.SECONDS);
 
     LOG.debug("Activating DecommissionManager with interval {} seconds, " +
-            "{} max blocks per interval, {} max nodes per interval, " +
+            "{} max blocks per interval, " +
             "{} max concurrently tracked nodes.", intervalSecs,
-        blocksPerInterval, nodesPerInterval, maxConcurrentTrackedNodes);
+        blocksPerInterval, maxConcurrentTrackedNodes);
   }
 
   /**
@@ -333,10 +323,6 @@ public class DecommissionManager {
      * The maximum number of blocks to check per tick.
      */
     private final int numBlocksPerCheck;
-    /**
-     * The maximum number of nodes to check per tick.
-     */
-    private final int numNodesPerCheck;
     /**
      * The maximum number of nodes to track in decomNodeBlocks. A value of 0
      * means no limit.
@@ -348,7 +334,7 @@ public class DecommissionManager {
     private int numBlocksChecked = 0;
     /**
      * The number of nodes that have been checked on this tick. Used for 
-     * testing.
+     * statistics.
      */
     private int numNodesChecked = 0;
     /**
@@ -357,10 +343,8 @@ public class DecommissionManager {
     private DatanodeDescriptor iterkey = new DatanodeDescriptor(new 
         DatanodeID("", "", "", 0, 0, 0, 0));
 
-    Monitor(int numBlocksPerCheck, int numNodesPerCheck, int 
-        maxConcurrentTrackedNodes) {
+    Monitor(int numBlocksPerCheck, int maxConcurrentTrackedNodes) {
       this.numBlocksPerCheck = numBlocksPerCheck;
-      this.numNodesPerCheck = numNodesPerCheck;
       this.maxConcurrentTrackedNodes = maxConcurrentTrackedNodes;
     }
 
@@ -369,12 +353,6 @@ public class DecommissionManager {
       return numBlocksChecked >= numBlocksPerCheck;
     }
 
-    @Deprecated
-    private boolean exceededNumNodesPerCheck() {
-      LOG.trace("Processed {} nodes so far this tick", numNodesChecked);
-      return numNodesChecked >= numNodesPerCheck;
-    }
-
     @Override
     public void run() {
       if (!namesystem.isRunning()) {
@@ -416,9 +394,7 @@ public class DecommissionManager {
           it = new CyclicIteration<>(decomNodeBlocks, iterkey).iterator();
       final LinkedList<DatanodeDescriptor> toRemove = new LinkedList<>();
 
-      while (it.hasNext()
-          && !exceededNumBlocksPerCheck()
-          && !exceededNumNodesPerCheck()) {
+      while (it.hasNext() && !exceededNumBlocksPerCheck()) {
         numNodesChecked++;
         final Map.Entry<DatanodeDescriptor, AbstractList<BlockInfo>>
             entry = it.next();

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDecommission.java

@@ -1045,32 +1045,6 @@ public class TestDecommission {
     doDecomCheck(datanodeManager, decomManager, 1);
   }
 
-  @Deprecated
-  @Test(timeout=120000)
-  public void testNodesPerInterval() throws Exception {
-    Configuration newConf = new Configuration(conf);
-    org.apache.log4j.Logger.getLogger(DecommissionManager.class)
-        .setLevel(Level.TRACE);
-    // Set the deprecated configuration key which limits the # of nodes per 
-    // interval
-    newConf.setInt("dfs.namenode.decommission.nodes.per.interval", 1);
-    // Disable the normal monitor runs
-    newConf.setInt(DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_INTERVAL_KEY,
-        Integer.MAX_VALUE);
-    startCluster(1, 3, newConf);
-    final FileSystem fs = cluster.getFileSystem();
-    final DatanodeManager datanodeManager =
-        cluster.getNamesystem().getBlockManager().getDatanodeManager();
-    final DecommissionManager decomManager = datanodeManager.getDecomManager();
-
-    // Write a 3 block file, so each node has one block. Should scan 1 node 
-    // each time.
-    DFSTestUtil.createFile(fs, new Path("/file1"), 64, (short) 3, 0xBAD1DEA);
-    for (int i=0; i<3; i++) {
-      doDecomCheck(datanodeManager, decomManager, 1);
-    }
-  }
-
   private void doDecomCheck(DatanodeManager datanodeManager,
       DecommissionManager decomManager, int expectedNumCheckedNodes)
       throws IOException, ExecutionException, InterruptedException {