HDFS-7933. fsck should also report decommissioning replicas. Contributed by Xiaoyu Yao.

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

@@ -425,6 +425,9 @@ Release 2.8.0 - UNRELEASED
     HdfsClientConfigKeys.Failover and fix typos in the dfs.http.client.*
     configuration keys.  (szetszwo)
 
+    HDFS-7933. fsck should also report decommissioning replicas.
+    (Xiaoyu Yao via cnauroth)
+
   OPTIMIZATIONS
 
     HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than

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

@@ -539,7 +539,7 @@ private void dumpBlockMeta(Block block, PrintWriter out) {
     // not included in the numReplicas.liveReplicas() count
     assert containingLiveReplicasNodes.size() >= numReplicas.liveReplicas();
     int usableReplicas = numReplicas.liveReplicas() +
-                         numReplicas.decommissionedReplicas();
+                         numReplicas.decommissionedAndDecommissioning();
     
     if (block instanceof BlockInfoContiguous) {
       BlockCollection bc = ((BlockInfoContiguous) block).getBlockCollection();
@@ -550,7 +550,7 @@ private void dumpBlockMeta(Block block, PrintWriter out) {
     out.print(block + ((usableReplicas > 0)? "" : " MISSING") + 
               " (replicas:" +
               " l: " + numReplicas.liveReplicas() +
-              " d: " + numReplicas.decommissionedReplicas() +
+              " d: " + numReplicas.decommissionedAndDecommissioning() +
               " c: " + numReplicas.corruptReplicas() +
               " e: " + numReplicas.excessReplicas() + ") "); 
 
@@ -730,7 +730,7 @@ public LocatedBlock convertLastBlockToUnderConstruction(
     // Remove block from replication queue.
     NumberReplicas replicas = countNodes(ucBlock);
     neededReplications.remove(ucBlock, replicas.liveReplicas(),
-        replicas.decommissionedReplicas(), getReplication(ucBlock));
+        replicas.decommissionedAndDecommissioning(), getReplication(ucBlock));
     pendingReplications.remove(ucBlock);
 
     // remove this block from the list of pending blocks to be deleted. 
@@ -1614,6 +1614,7 @@ DatanodeDescriptor chooseSourceDatanode(Block block,
     DatanodeDescriptor srcNode = null;
     int live = 0;
     int decommissioned = 0;
+    int decommissioning = 0;
     int corrupt = 0;
     int excess = 0;
     
@@ -1625,9 +1626,11 @@ DatanodeDescriptor chooseSourceDatanode(Block block,
       int countableReplica = storage.getState() == State.NORMAL ? 1 : 0; 
       if ((nodesCorrupt != null) && (nodesCorrupt.contains(node)))
         corrupt += countableReplica;
-      else if (node.isDecommissionInProgress() || node.isDecommissioned())
+      else if (node.isDecommissionInProgress()) {
+        decommissioning += countableReplica;
+      } else if (node.isDecommissioned()) {
         decommissioned += countableReplica;
-      else if (excessBlocks != null && excessBlocks.contains(block)) {
+      } else if (excessBlocks != null && excessBlocks.contains(block)) {
         excess += countableReplica;
       } else {
         nodesContainingLiveReplicas.add(storage);
@@ -1667,7 +1670,8 @@ else if (excessBlocks != null && excessBlocks.contains(block)) {
         srcNode = node;
     }
     if(numReplicas != null)
-      numReplicas.initialize(live, decommissioned, corrupt, excess, 0);
+      numReplicas.initialize(live, decommissioned, decommissioning, corrupt,
+          excess, 0);
     return srcNode;
   }
 
@@ -1686,7 +1690,7 @@ private void processPendingReplications() {
                                  num.liveReplicas())) {
             neededReplications.add(timedOutItems[i],
                                    num.liveReplicas(),
-                                   num.decommissionedReplicas(),
+                                   num.decommissionedAndDecommissioning(),
                                    getReplication(timedOutItems[i]));
           }
         }
@@ -2573,7 +2577,7 @@ private Block addStoredBlock(final BlockInfoContiguous block,
     short fileReplication = bc.getBlockReplication();
     if (!isNeededReplication(storedBlock, fileReplication, numCurrentReplica)) {
       neededReplications.remove(storedBlock, numCurrentReplica,
-          num.decommissionedReplicas(), fileReplication);
+          num.decommissionedAndDecommissioning(), fileReplication);
     } else {
       updateNeededReplications(storedBlock, curReplicaDelta, 0);
     }
@@ -2807,7 +2811,7 @@ private MisReplicationResult processMisReplicatedBlock(BlockInfoContiguous block
     // add to under-replicated queue if need to be
     if (isNeededReplication(block, expectedReplication, numCurrentReplica)) {
       if (neededReplications.add(block, numCurrentReplica, num
-          .decommissionedReplicas(), expectedReplication)) {
+          .decommissionedAndDecommissioning(), expectedReplication)) {
         return MisReplicationResult.UNDER_REPLICATED;
       }
     }
@@ -3221,6 +3225,7 @@ public void processIncrementalBlockReport(final DatanodeID nodeID,
    */
   public NumberReplicas countNodes(Block b) {
     int decommissioned = 0;
+    int decommissioning = 0;
     int live = 0;
     int corrupt = 0;
     int excess = 0;
@@ -3230,7 +3235,9 @@ public NumberReplicas countNodes(Block b) {
       final DatanodeDescriptor node = storage.getDatanodeDescriptor();
       if ((nodesCorrupt != null) && (nodesCorrupt.contains(node))) {
         corrupt++;
-      } else if (node.isDecommissionInProgress() || node.isDecommissioned()) {
+      } else if (node.isDecommissionInProgress()) {
+        decommissioning++;
+      } else if (node.isDecommissioned()) {
         decommissioned++;
       } else {
         LightWeightLinkedSet<Block> blocksExcess = excessReplicateMap.get(node
@@ -3245,7 +3252,7 @@ public NumberReplicas countNodes(Block b) {
         stale++;
       }
     }
-    return new NumberReplicas(live, decommissioned, corrupt, excess, stale);
+    return new NumberReplicas(live, decommissioned, decommissioning, corrupt, excess, stale);
   }
 
   /** 
@@ -3382,13 +3389,13 @@ private void updateNeededReplications(final Block block,
       int curExpectedReplicas = getReplication(block);
       if (isNeededReplication(block, curExpectedReplicas, repl.liveReplicas())) {
         neededReplications.update(block, repl.liveReplicas(), repl
-            .decommissionedReplicas(), curExpectedReplicas, curReplicasDelta,
+            .decommissionedAndDecommissioning(), curExpectedReplicas,
-            expectedReplicasDelta);
+            curReplicasDelta, expectedReplicasDelta);
       } else {
         int oldReplicas = repl.liveReplicas()-curReplicasDelta;
         int oldExpectedReplicas = curExpectedReplicas-expectedReplicasDelta;
-        neededReplications.remove(block, oldReplicas, repl.decommissionedReplicas(),
+        neededReplications.remove(block, oldReplicas,
-                                  oldExpectedReplicas);
+            repl.decommissionedAndDecommissioning(), oldExpectedReplicas);
       }
     } finally {
       namesystem.writeUnlock();
@@ -3407,7 +3414,7 @@ public void checkReplication(BlockCollection bc) {
       final NumberReplicas n = countNodes(block);
       if (isNeededReplication(block, expected, n.liveReplicas())) { 
         neededReplications.add(block, n.liveReplicas(),
-            n.decommissionedReplicas(), expected);
+            n.decommissionedAndDecommissioning(), expected);
       } else if (n.liveReplicas() > expected) {
         processOverReplicatedBlock(block, expected, null, null);
       }

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

@@ -298,7 +298,8 @@ private static void logBlockReplicationInfo(Block block, BlockCollection bc,
     LOG.info("Block: " + block + ", Expected Replicas: "
         + curExpectedReplicas + ", live replicas: " + curReplicas
         + ", corrupt replicas: " + num.corruptReplicas()
-        + ", decommissioned replicas: " + num.decommissionedReplicas()
+        + ", decommissioned replicas: " + num.decommissioned()
+        + ", decommissioning replicas: " + num.decommissioning()
         + ", excess replicas: " + num.excessReplicas()
         + ", Is Open File: " + bc.isUnderConstruction()
         + ", Datanodes having this block: " + nodeList + ", Current Datanode: "
@@ -571,7 +572,7 @@ private void processBlocksForDecomInternal(
             // Process these blocks only when active NN is out of safe mode.
             blockManager.neededReplications.add(block,
                 curReplicas,
-                num.decommissionedReplicas(),
+                num.decommissionedAndDecommissioning(),
                 bc.getBlockReplication());
           }
         }
@@ -600,7 +601,7 @@ private void processBlocksForDecomInternal(
         if (bc.isUnderConstruction()) {
           underReplicatedInOpenFiles++;
         }
-        if ((curReplicas == 0) && (num.decommissionedReplicas() > 0)) {
+        if ((curReplicas == 0) && (num.decommissionedAndDecommissioning() > 0)) {
           decommissionOnlyReplicas++;
         }
       }

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

@@ -19,26 +19,33 @@
 
 /**
  * A immutable object that stores the number of live replicas and
- * the number of decommissined Replicas.
+ * the number of decommissioned Replicas.
  */
 public class NumberReplicas {
   private int liveReplicas;
-  private int decommissionedReplicas;
+
+  // Tracks only the decommissioning replicas
+  private int decommissioning;
+  // Tracks only the decommissioned replicas
+  private int decommissioned;
   private int corruptReplicas;
   private int excessReplicas;
   private int replicasOnStaleNodes;
 
   NumberReplicas() {
-    initialize(0, 0, 0, 0, 0);
+    initialize(0, 0, 0, 0, 0, 0);
   }
 
-  NumberReplicas(int live, int decommissioned, int corrupt, int excess, int stale) {
+  NumberReplicas(int live, int decommissioned, int decommissioning, int corrupt,
-    initialize(live, decommissioned, corrupt, excess, stale);
+                 int excess, int stale) {
+    initialize(live, decommissioned, decommissioning, corrupt, excess, stale);
   }
 
-  void initialize(int live, int decommissioned, int corrupt, int excess, int stale) {
+  void initialize(int live, int decommissioned, int decommissioning,
+                  int corrupt, int excess, int stale) {
     liveReplicas = live;
-    decommissionedReplicas = decommissioned;
+    this.decommissioning = decommissioning;
+    this.decommissioned = decommissioned;
     corruptReplicas = corrupt;
     excessReplicas = excess;
     replicasOnStaleNodes = stale;
@@ -47,12 +54,46 @@ void initialize(int live, int decommissioned, int corrupt, int excess, int stale
   public int liveReplicas() {
     return liveReplicas;
   }
+
+  /**
+   *
+   * @return decommissioned replicas + decommissioning replicas
+   * It is deprecated by decommissionedAndDecommissioning
+   * due to its misleading name.
+   */
+  @Deprecated
   public int decommissionedReplicas() {
-    return decommissionedReplicas;
+    return decommissionedAndDecommissioning();
   }
+
+  /**
+   *
+   * @return decommissioned and decommissioning replicas
+   */
+  public int decommissionedAndDecommissioning() {
+    return decommissioned + decommissioning;
+  }
+
+  /**
+   *
+   * @return decommissioned replicas only
+   */
+  public int decommissioned() {
+    return decommissioned;
+  }
+
+  /**
+   *
+   * @return decommissioning replicas only
+   */
+  public int decommissioning() {
+    return decommissioning;
+  }
+
   public int corruptReplicas() {
     return corruptReplicas;
   }
+
   public int excessReplicas() {
     return excessReplicas;
   }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NamenodeFsck.java

@@ -250,8 +250,10 @@ public void blockIdCK(String blockId) {
       out.println("No. of live Replica: " + numberReplicas.liveReplicas());
       out.println("No. of excess Replica: " + numberReplicas.excessReplicas());
       out.println("No. of stale Replica: " + numberReplicas.replicasOnStaleNodes());
-      out.println("No. of decommission Replica: "
+      out.println("No. of decommissioned Replica: "
-          + numberReplicas.decommissionedReplicas());
+          + numberReplicas.decommissioned());
+      out.println("No. of decommissioning Replica: "
+          + numberReplicas.decommissioning());
       out.println("No. of corrupted Replica: " + numberReplicas.corruptReplicas());
       //record datanodes that have corrupted block replica
       Collection<DatanodeDescriptor> corruptionRecord = null;
@@ -509,10 +511,16 @@ void check(String parent, HdfsFileStatus file, Result res) throws IOException {
       NumberReplicas numberReplicas =
           namenode.getNamesystem().getBlockManager().countNodes(block.getLocalBlock());
       int liveReplicas = numberReplicas.liveReplicas();
-      res.totalReplicas += liveReplicas;
+      int decommissionedReplicas = numberReplicas.decommissioned();;
+      int decommissioningReplicas = numberReplicas.decommissioning();
+      res.decommissionedReplicas +=  decommissionedReplicas;
+      res.decommissioningReplicas += decommissioningReplicas;
+      int totalReplicas = liveReplicas + decommissionedReplicas +
+          decommissioningReplicas;
+      res.totalReplicas += totalReplicas;
       short targetFileReplication = file.getReplication();
       res.numExpectedReplicas += targetFileReplication;
-      if(liveReplicas<minReplication){
+      if(totalReplicas < minReplication){
         res.numUnderMinReplicatedBlocks++;
       }
       if (liveReplicas > targetFileReplication) {
@@ -532,10 +540,10 @@ void check(String parent, HdfsFileStatus file, Result res) throws IOException {
         out.print("\n" + path + ": CORRUPT blockpool " + block.getBlockPoolId() + 
             " block " + block.getBlockName()+"\n");
       }
-      if (liveReplicas >= minReplication)
+      if (totalReplicas >= minReplication)
         res.numMinReplicatedBlocks++;
-      if (liveReplicas < targetFileReplication && liveReplicas > 0) {
+      if (totalReplicas < targetFileReplication && totalReplicas > 0) {
-        res.missingReplicas += (targetFileReplication - liveReplicas);
+        res.missingReplicas += (targetFileReplication - totalReplicas);
         res.numUnderReplicatedBlocks += 1;
         underReplicatedPerFile++;
         if (!showFiles) {
@@ -544,7 +552,9 @@ void check(String parent, HdfsFileStatus file, Result res) throws IOException {
         out.println(" Under replicated " + block +
                     ". Target Replicas is " +
                     targetFileReplication + " but found " +
-                    liveReplicas + " replica(s).");
+                    liveReplicas + " live replica(s), " +
+                    decommissionedReplicas + " decommissioned replica(s) and " +
+                    decommissioningReplicas + " decommissioning replica(s).");
       }
       // verify block placement policy
       BlockPlacementStatus blockPlacementStatus = bpPolicy
@@ -561,7 +571,7 @@ void check(String parent, HdfsFileStatus file, Result res) throws IOException {
                     block + ". " + blockPlacementStatus.getErrorDescription());
       }
       report.append(i + ". " + blkName + " len=" + block.getNumBytes());
-      if (liveReplicas == 0) {
+      if (totalReplicas == 0) {
         report.append(" MISSING!");
         res.addMissing(block.toString(), block.getNumBytes());
         missing++;
@@ -861,6 +871,8 @@ static class Result {
     long corruptBlocks = 0L;
     long excessiveReplicas = 0L;
     long missingReplicas = 0L;
+    long decommissionedReplicas = 0L;
+    long decommissioningReplicas = 0L;
     long numUnderMinReplicatedBlocks=0L;
     long numOverReplicatedBlocks = 0L;
     long numUnderReplicatedBlocks = 0L;
@@ -932,7 +944,7 @@ public String toString() {
         res.append(" (Total open file blocks (not validated): ").append(
             totalOpenFilesBlocks).append(")");
       }
-      if (corruptFiles > 0 || numUnderMinReplicatedBlocks>0) {
+      if (corruptFiles > 0 || numUnderMinReplicatedBlocks > 0) {
         res.append("\n  ********************************");
         if(numUnderMinReplicatedBlocks>0){
           res.append("\n  UNDER MIN REPL'D BLOCKS:\t").append(numUnderMinReplicatedBlocks);
@@ -995,6 +1007,14 @@ public String toString() {
             ((float) (missingReplicas * 100) / (float) numExpectedReplicas)).append(
             " %)");
       }
+      if (decommissionedReplicas > 0) {
+        res.append("\n DecommissionedReplicas:\t").append(
+            decommissionedReplicas);
+      }
+      if (decommissioningReplicas > 0) {
+        res.append("\n DecommissioningReplicas:\t").append(
+            decommissioningReplicas);
+      }
       return res.toString();
     }
   }

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

@@ -192,7 +192,7 @@ public void testCorruptTwoOutOfThreeReplicas() throws Exception {
       verifyFirstBlockCorrupted(filePath, false);
       int expectedReplicaCount = repl-corruptBlocReplicas;
       verifyCorruptedBlockCount(filePath, expectedReplicaCount);
-      verifyFsckHealth("Target Replicas is 3 but found 1 replica");
+      verifyFsckHealth("Target Replicas is 3 but found 1 live replica");
       testFsckListCorruptFilesBlocks(filePath, 0);
     }
   }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestReadOnlySharedStorage.java

@@ -192,7 +192,7 @@ private void validateNumberReplicas(int expectedReplicas) throws IOException {
     assertThat(numberReplicas.liveReplicas(), is(expectedReplicas));
     assertThat(numberReplicas.excessReplicas(), is(0));
     assertThat(numberReplicas.corruptReplicas(), is(0));
-    assertThat(numberReplicas.decommissionedReplicas(), is(0));
+    assertThat(numberReplicas.decommissionedAndDecommissioning(), is(0));
     assertThat(numberReplicas.replicasOnStaleNodes(), is(0));
     
     BlockManagerTestUtil.updateState(blockManager);

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFsck.java

@@ -1464,4 +1464,85 @@ public void testStoragePoliciesCK() throws Exception {
       }
     }
   }
+
+  /**
+   * Test for blocks on decommissioning hosts are not shown as missing
+   */
+  @Test
+  public void testFsckWithDecommissionedReplicas() throws Exception {
+
+    final short REPL_FACTOR = 1;
+    short NUM_DN = 2;
+    final long blockSize = 512;
+    final long fileSize = 1024;
+    boolean checkDecommissionInProgress = false;
+    String [] racks = {"/rack1", "/rack2"};
+    String [] hosts = {"host1", "host2"};
+
+    Configuration conf = new Configuration();
+    conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, blockSize);
+    conf.setInt(DFSConfigKeys.DFS_REPLICATION_KEY, 1);
+
+    MiniDFSCluster cluster;
+    DistributedFileSystem dfs ;
+    cluster =
+        new MiniDFSCluster.Builder(conf).numDataNodes(NUM_DN).hosts(hosts)
+            .racks(racks).build();
+
+    assertNotNull("Failed Cluster Creation", cluster);
+    cluster.waitClusterUp();
+    dfs = cluster.getFileSystem();
+    assertNotNull("Failed to get FileSystem", dfs);
+
+    DFSTestUtil util = new DFSTestUtil.Builder().
+        setName(getClass().getSimpleName()).setNumFiles(1).build();
+
+    //create files
+    final String testFile = new String("/testfile");
+    final Path path = new Path(testFile);
+    util.createFile(dfs, path, fileSize, REPL_FACTOR, 1000L);
+    util.waitReplication(dfs, path, REPL_FACTOR);
+    try {
+      // make sure datanode that has replica is fine before decommission
+      String outStr = runFsck(conf, 0, true, testFile);
+      System.out.println(outStr);
+      assertTrue(outStr.contains(NamenodeFsck.HEALTHY_STATUS));
+
+      // decommission datanode
+      ExtendedBlock eb = util.getFirstBlock(dfs, path);
+      DatanodeDescriptor dn = cluster.getNameNode().getNamesystem()
+          .getBlockManager().getBlockCollection(eb.getLocalBlock())
+          .getBlocks()[0].getDatanode(0);
+      cluster.getNameNode().getNamesystem().getBlockManager()
+          .getDatanodeManager().getDecomManager().startDecommission(dn);
+      String dnName = dn.getXferAddr();
+
+      // wait for decommission start
+      DatanodeInfo datanodeInfo = null;
+      int count = 0;
+      do {
+        Thread.sleep(2000);
+        for (DatanodeInfo info : dfs.getDataNodeStats()) {
+          if (dnName.equals(info.getXferAddr())) {
+            datanodeInfo = info;
+          }
+        }
+        // check the replica status should be healthy(0)
+        // instead of corruption (1) during decommissioning
+        if(!checkDecommissionInProgress && datanodeInfo != null
+            && datanodeInfo.isDecommissionInProgress()) {
+          String fsckOut = runFsck(conf, 0, true, testFile);
+          checkDecommissionInProgress =  true;
+        }
+      } while (datanodeInfo != null && !datanodeInfo.isDecommissioned());
+
+      // check the replica status should be healthy(0) after decommission
+      // is done
+      String fsckOut = runFsck(conf, 0, true, testFile);
+    } finally {
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
 }