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

This commit is contained in:
Kihwal Lee 2017-05-25 17:17:38 -05:00
parent 87590090c8
commit 2b5ad48762
8 changed files with 73 additions and 13 deletions
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9
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockUnderConstructionFeature.java
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@ -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:" +

3
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java
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@ -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(

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirTruncateOp.java
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@ -270,7 +270,7 @@ final class FSDirTruncateOp {
}
if (shouldRecoverNow) {
truncatedBlockUC.getUnderConstructionFeature().initializeBlockRecovery(
truncatedBlockUC, newBlock.getGenerationStamp());
truncatedBlockUC, newBlock.getGenerationStamp(), true);
}
return newBlock;

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@ -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

11
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/LeaseManager.java
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@ -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);
}

8
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockUnderConstructionFeature.java
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@ -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);
}

45
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestBlockUnderConstruction.java
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@ -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);
}
}

2
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestCommitBlockSynchronization.java
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@ -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();