HDFS-11817. A faulty node can cause a lease leak and NPE on accessing data. Contributed by Kihwal Lee.

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

@@ -223,10 +223,17 @@ public class BlockUnderConstructionFeature {
    * Initialize lease recovery for this block.
    * Find the first alive data-node starting from the previous primary and
    * make it primary.
+   * @param blockInfo Block to be recovered
+   * @param recoveryId Recovery ID (new gen stamp)
+   * @param startRecovery Issue recovery command to datanode if true.
    */
-  public void initializeBlockRecovery(BlockInfo blockInfo, long recoveryId) {
+  public void initializeBlockRecovery(BlockInfo blockInfo, long recoveryId,
+      boolean startRecovery) {
     setBlockUCState(BlockUCState.UNDER_RECOVERY);
     blockRecoveryId = recoveryId;
+    if (!startRecovery) {
+      return;
+    }
     if (replicas.length == 0) {
       NameNode.blockStateChangeLog.warn("BLOCK*" +
           " BlockUnderConstructionFeature.initializeBlockRecovery:" +

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

@@ -642,10 +642,11 @@ public class DatanodeManager {
       String format, Object... args) throws UnregisteredNodeException {
     storageIDs = storageIDs == null ? new String[0] : storageIDs;
     if (datanodeID.length != storageIDs.length) {
+      // Error for pre-2.0.0-alpha clients.
       final String err = (storageIDs.length == 0?
           "Missing storageIDs: It is likely that the HDFS client,"
           + " who made this call, is running in an older version of Hadoop"
-          + " which does not support storageIDs."
+          + "(pre-2.0.0-alpha)  which does not support storageIDs."
           : "Length mismatched: storageIDs.length=" + storageIDs.length + " != "
           ) + " datanodeID.length=" + datanodeID.length;
       throw new HadoopIllegalArgumentException(

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

@@ -270,7 +270,7 @@ final class FSDirTruncateOp {
     }
     if (shouldRecoverNow) {
       truncatedBlockUC.getUnderConstructionFeature().initializeBlockRecovery(
-          truncatedBlockUC, newBlock.getGenerationStamp());
+          truncatedBlockUC, newBlock.getGenerationStamp(), true);
     }
 
     return newBlock;

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

@@ -3250,7 +3250,7 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
       } else if(truncateRecovery) {
         recoveryBlock.setGenerationStamp(blockRecoveryId);
       }
-      uc.initializeBlockRecovery(lastBlock, blockRecoveryId);
+      uc.initializeBlockRecovery(lastBlock, blockRecoveryId, true);
       leaseManager.renewLease(lease);
       // Cannot close file right now, since the last block requires recovery.
       // This may potentially cause infinite loop in lease recovery

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

@@ -475,9 +475,16 @@ public class LeaseManager {
           if (!p.startsWith("/")) {
             throw new IOException("Invalid path in the lease " + p);
           }
-          boolean completed = fsnamesystem.internalReleaseLease(
+          boolean completed = false;
+          try {
+            completed = fsnamesystem.internalReleaseLease(
                 leaseToCheck, p, iip,
                 HdfsServerConstants.NAMENODE_LEASE_HOLDER);
+          } catch (IOException e) {
+            LOG.warn("Cannot release the path " + p + " in the lease "
+                + leaseToCheck + ". It will be retried.", e);
+            continue;
+          }
           if (LOG.isDebugEnabled()) {
             if (completed) {
               LOG.debug("Lease recovery for inode " + id + " is complete. " +
@@ -491,7 +498,7 @@ public class LeaseManager {
             needSync = true;
           }
         } catch (IOException e) {
-          LOG.error("Cannot release the path " + p + " in the lease "
+          LOG.warn("Removing lease with an invalid path: " + p + ","
               + leaseToCheck, e);
           removing.add(id);
         }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockUnderConstructionFeature.java

@@ -50,7 +50,7 @@ public class TestBlockUnderConstructionFeature {
     DFSTestUtil.resetLastUpdatesWithOffset(dd1, -3 * 1000);
     DFSTestUtil.resetLastUpdatesWithOffset(dd2, -1 * 1000);
     DFSTestUtil.resetLastUpdatesWithOffset(dd3, -2 * 1000);
-    blockInfo.getUnderConstructionFeature().initializeBlockRecovery(blockInfo, 1);
+    blockInfo.getUnderConstructionFeature().initializeBlockRecovery(blockInfo, 1, true);
     BlockInfo[] blockInfoRecovery = dd2.getLeaseRecoveryCommand(1);
     assertEquals(blockInfoRecovery[0], blockInfo);
 
@@ -58,7 +58,7 @@ public class TestBlockUnderConstructionFeature {
     DFSTestUtil.resetLastUpdatesWithOffset(dd1, -2 * 1000);
     DFSTestUtil.resetLastUpdatesWithOffset(dd2, -1 * 1000);
     DFSTestUtil.resetLastUpdatesWithOffset(dd3, -3 * 1000);
-    blockInfo.getUnderConstructionFeature().initializeBlockRecovery(blockInfo, 2);
+    blockInfo.getUnderConstructionFeature().initializeBlockRecovery(blockInfo, 2, true);
     blockInfoRecovery = dd1.getLeaseRecoveryCommand(1);
     assertEquals(blockInfoRecovery[0], blockInfo);
 
@@ -66,7 +66,7 @@ public class TestBlockUnderConstructionFeature {
     DFSTestUtil.resetLastUpdatesWithOffset(dd1, -2 * 1000);
     DFSTestUtil.resetLastUpdatesWithOffset(dd2, -1 * 1000);
     DFSTestUtil.resetLastUpdatesWithOffset(dd3, -3 * 1000);
-    blockInfo.getUnderConstructionFeature().initializeBlockRecovery(blockInfo, 3);
+    blockInfo.getUnderConstructionFeature().initializeBlockRecovery(blockInfo, 3, true);
     blockInfoRecovery = dd3.getLeaseRecoveryCommand(1);
     assertEquals(blockInfoRecovery[0], blockInfo);
 
@@ -75,7 +75,7 @@ public class TestBlockUnderConstructionFeature {
     DFSTestUtil.resetLastUpdatesWithOffset(dd1, -2 * 1000);
     DFSTestUtil.resetLastUpdatesWithOffset(dd2, -1 * 1000);
     DFSTestUtil.resetLastUpdatesWithOffset(dd3, 0);
-    blockInfo.getUnderConstructionFeature().initializeBlockRecovery(blockInfo, 3);
+    blockInfo.getUnderConstructionFeature().initializeBlockRecovery(blockInfo, 3, true);
     blockInfoRecovery = dd3.getLeaseRecoveryCommand(1);
     assertEquals(blockInfoRecovery[0], blockInfo);
   }

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

@@ -38,12 +38,16 @@ import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockManager;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockUnderConstructionFeature;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.BlockUCState;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocols;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.Test;
 
+import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.LocatedBlockProto;
+import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
+
 public class TestBlockUnderConstruction {
   static final String BASE_DIR = "/test/TestBlockUnderConstruction";
   static final int BLOCK_SIZE = 8192; // same as TestFileCreation.blocksize
@@ -183,4 +187,45 @@ public class TestBlockUnderConstruction {
     // close file
     out.close();
   }
+
+  /**
+   * A storage ID can be invalid if the storage failed or the node
+   * reregisters. When the node heart-beats, the storage report in it
+   * causes storage volumes to be added back. An invalid storage ID
+   * should not cause an NPE.
+   */
+  @Test
+  public void testEmptyExpectedLocations() throws Exception {
+    final NamenodeProtocols namenode = cluster.getNameNodeRpc();
+    final FSNamesystem fsn = cluster.getNamesystem();
+    final BlockManager bm = fsn.getBlockManager();
+    final Path p = new Path(BASE_DIR, "file2.dat");
+    final String src = p.toString();
+    final FSDataOutputStream out = TestFileCreation.createFile(hdfs, p, 1);
+    writeFile(p, out, 256);
+    out.hflush();
+
+    // make sure the block is readable
+    LocatedBlocks lbs = namenode.getBlockLocations(src, 0, 256);
+    LocatedBlock lastLB = lbs.getLocatedBlocks().get(0);
+    final Block b = lastLB.getBlock().getLocalBlock();
+
+    // fake a block recovery
+    long blockRecoveryId = bm.nextGenerationStamp(false);
+    BlockUnderConstructionFeature uc = bm.getStoredBlock(b).
+        getUnderConstructionFeature();
+    uc.initializeBlockRecovery(null, blockRecoveryId, false);
+
+    try {
+      String[] storages = { "invalid-storage-id1" };
+      fsn.commitBlockSynchronization(lastLB.getBlock(), blockRecoveryId, 256L,
+          true, false, lastLB.getLocations(), storages);
+    } catch (java.lang.IllegalStateException ise) {
+       // Although a failure is expected as of now, future commit policy
+       // changes may make it not fail. This is not critical to the test.
+    }
+
+    // Invalid storage should not trigger an exception.
+    lbs = namenode.getBlockLocations(src, 0, 256);
+  }
 }

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

@@ -73,7 +73,7 @@ public class TestCommitBlockSynchronization {
     blockInfo.setBlockCollectionId(file.getId());
     blockInfo.setGenerationStamp(genStamp);
     blockInfo.getUnderConstructionFeature().initializeBlockRecovery(blockInfo,
-        genStamp);
+        genStamp, true);
     doReturn(blockInfo).when(file).removeLastBlock(any(Block.class));
     doReturn(true).when(file).isUnderConstruction();
     doReturn(new BlockInfoContiguous[1]).when(file).getBlocks();