HDFS-5438. Flaws in block report processing can cause data loss. Contributed by Kihwal Lee.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1542054 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Kihwal Lee
parent
1a76ccbbc4
commit
ceea91c9cd
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@ -560,6 +560,8 @@ Release 2.3.0 - UNRELEASED
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HDFS-5504. In HA mode, OP_DELETE_SNAPSHOT is not decrementing the safemode threshold,
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leads to NN safemode. (Vinay via jing9)
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HDFS-5438. Flaws in block report processing can cause data loss. (kihwal)
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Release 2.2.1 - UNRELEASED
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INCOMPATIBLE CHANGES
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@ -42,4 +42,8 @@ public class DFSClientFaultInjector {
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public boolean uncorruptPacket() {
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return false;
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}
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public boolean failPacket() {
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return false;
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}
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}
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@ -151,6 +151,7 @@ public class DFSOutputStream extends FSOutputSummer
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private final short blockReplication; // replication factor of file
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private boolean shouldSyncBlock = false; // force blocks to disk upon close
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private CachingStrategy cachingStrategy;
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private boolean failPacket = false;
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private static class Packet {
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private static final long HEART_BEAT_SEQNO = -1L;
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@ -743,6 +744,16 @@ public class DFSOutputStream extends FSOutputSummer
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one.seqno + " but received " + seqno);
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}
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isLastPacketInBlock = one.lastPacketInBlock;
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// Fail the packet write for testing in order to force a
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// pipeline recovery.
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if (DFSClientFaultInjector.get().failPacket() &&
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isLastPacketInBlock) {
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failPacket = true;
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throw new IOException(
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"Failing the last packet for testing.");
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}
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// update bytesAcked
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block.setNumBytes(one.getLastByteOffsetBlock());
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@ -1027,8 +1038,19 @@ public class DFSOutputStream extends FSOutputSummer
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accessToken = lb.getBlockToken();
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// set up the pipeline again with the remaining nodes
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if (failPacket) { // for testing
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success = createBlockOutputStream(nodes, newGS-1, isRecovery);
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failPacket = false;
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try {
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// Give DNs time to send in bad reports. In real situations,
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// good reports should follow bad ones, if client committed
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// with those nodes.
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Thread.sleep(2000);
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} catch (InterruptedException ie) {}
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} else {
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success = createBlockOutputStream(nodes, newGS, isRecovery);
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}
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}
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if (success) {
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// update pipeline at the namenode
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@ -1886,7 +1908,9 @@ public class DFSOutputStream extends FSOutputSummer
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// be called during unit tests
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private void completeFile(ExtendedBlock last) throws IOException {
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long localstart = Time.now();
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long localTimeout = 400;
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boolean fileComplete = false;
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int retries = dfsClient.getConf().nBlockWriteLocateFollowingRetry;
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while (!fileComplete) {
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fileComplete =
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dfsClient.namenode.complete(src, dfsClient.clientName, last, fileId);
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@ -1902,7 +1926,13 @@ public class DFSOutputStream extends FSOutputSummer
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throw new IOException(msg);
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}
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try {
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Thread.sleep(400);
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Thread.sleep(localTimeout);
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if (retries == 0) {
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throw new IOException("Unable to close file because the last block"
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+ " does not have enough number of replicas.");
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}
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retries--;
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localTimeout *= 2;
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if (Time.now() - localstart > 5000) {
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DFSClient.LOG.info("Could not complete " + src + " retrying...");
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}
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@ -229,6 +229,29 @@ public class BlockInfoUnderConstruction extends BlockInfo {
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return blockRecoveryId;
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}
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/**
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* Process the recorded replicas. When about to commit or finish the
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* pipeline recovery sort out bad replicas.
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* @param genStamp The final generation stamp for the block.
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*/
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public void setGenerationStampAndVerifyReplicas(long genStamp) {
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if (replicas == null)
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return;
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// Remove the replicas with wrong gen stamp.
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// The replica list is unchanged.
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for (ReplicaUnderConstruction r : replicas) {
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if (genStamp != r.getGenerationStamp()) {
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r.getExpectedLocation().removeBlock(this);
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NameNode.blockStateChangeLog.info("BLOCK* Removing stale replica "
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+ "from location: " + r);
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}
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}
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// Set the generation stamp for the block.
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setGenerationStamp(genStamp);
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}
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/**
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* Commit block's length and generation stamp as reported by the client.
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* Set block state to {@link BlockUCState#COMMITTED}.
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@ -295,9 +318,13 @@ public class BlockInfoUnderConstruction extends BlockInfo {
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void addReplicaIfNotPresent(DatanodeDescriptor dn,
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Block block,
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ReplicaState rState) {
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for(ReplicaUnderConstruction r : replicas)
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if(r.getExpectedLocation() == dn)
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for (ReplicaUnderConstruction r : replicas) {
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if (r.getExpectedLocation() == dn) {
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// Record the gen stamp from the report
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r.setGenerationStamp(block.getGenerationStamp());
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return;
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}
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}
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replicas.add(new ReplicaUnderConstruction(block, dn, rState));
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}
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@ -57,6 +57,7 @@ import org.apache.hadoop.hdfs.security.token.block.BlockTokenSecretManager;
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import org.apache.hadoop.hdfs.security.token.block.BlockTokenSecretManager.AccessMode;
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import org.apache.hadoop.hdfs.security.token.block.DataEncryptionKey;
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import org.apache.hadoop.hdfs.security.token.block.ExportedBlockKeys;
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import org.apache.hadoop.hdfs.server.blockmanagement.CorruptReplicasMap.Reason;
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import org.apache.hadoop.hdfs.server.blockmanagement.PendingDataNodeMessages.ReportedBlockInfo;
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import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.BlockUCState;
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import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.ReplicaState;
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@ -1046,7 +1047,8 @@ public class BlockManager {
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+ blk + " not found");
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return;
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}
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markBlockAsCorrupt(new BlockToMarkCorrupt(storedBlock, reason), dn);
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markBlockAsCorrupt(new BlockToMarkCorrupt(storedBlock, reason,
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Reason.CORRUPTION_REPORTED), dn);
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}
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private void markBlockAsCorrupt(BlockToMarkCorrupt b,
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@ -1069,7 +1071,8 @@ public class BlockManager {
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node.addBlock(b.stored);
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// Add this replica to corruptReplicas Map
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corruptReplicas.addToCorruptReplicasMap(b.corrupted, node, b.reason);
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corruptReplicas.addToCorruptReplicasMap(b.corrupted, node, b.reason,
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b.reasonCode);
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if (countNodes(b.stored).liveReplicas() >= bc.getBlockReplication()) {
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// the block is over-replicated so invalidate the replicas immediately
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invalidateBlock(b, node);
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@ -1570,22 +1573,27 @@ public class BlockManager {
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final BlockInfo stored;
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/** The reason to mark corrupt. */
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final String reason;
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/** The reason code to be stored */
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final Reason reasonCode;
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BlockToMarkCorrupt(BlockInfo corrupted, BlockInfo stored, String reason) {
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BlockToMarkCorrupt(BlockInfo corrupted, BlockInfo stored, String reason,
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Reason reasonCode) {
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Preconditions.checkNotNull(corrupted, "corrupted is null");
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Preconditions.checkNotNull(stored, "stored is null");
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this.corrupted = corrupted;
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this.stored = stored;
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this.reason = reason;
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this.reasonCode = reasonCode;
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}
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BlockToMarkCorrupt(BlockInfo stored, String reason) {
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this(stored, stored, reason);
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BlockToMarkCorrupt(BlockInfo stored, String reason, Reason reasonCode) {
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this(stored, stored, reason, reasonCode);
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}
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BlockToMarkCorrupt(BlockInfo stored, long gs, String reason) {
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this(new BlockInfo(stored), stored, reason);
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BlockToMarkCorrupt(BlockInfo stored, long gs, String reason,
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Reason reasonCode) {
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this(new BlockInfo(stored), stored, reason, reasonCode);
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//the corrupted block in datanode has a different generation stamp
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corrupted.setGenerationStamp(gs);
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}
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@ -1930,9 +1938,11 @@ assert storedBlock.findDatanode(dn) < 0 : "Block " + block
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return storedBlock;
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}
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//add replica if appropriate
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// Add replica if appropriate. If the replica was previously corrupt
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// but now okay, it might need to be updated.
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if (reportedState == ReplicaState.FINALIZED
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&& storedBlock.findDatanode(dn) < 0) {
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&& (storedBlock.findDatanode(dn) < 0
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|| corruptReplicas.isReplicaCorrupt(storedBlock, dn))) {
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toAdd.add(storedBlock);
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}
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return storedBlock;
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@ -2023,12 +2033,13 @@ assert storedBlock.findDatanode(dn) < 0 : "Block " + block
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return new BlockToMarkCorrupt(storedBlock, reportedGS,
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"block is " + ucState + " and reported genstamp " + reportedGS
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+ " does not match genstamp in block map "
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+ storedBlock.getGenerationStamp());
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+ storedBlock.getGenerationStamp(), Reason.GENSTAMP_MISMATCH);
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} else if (storedBlock.getNumBytes() != reported.getNumBytes()) {
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return new BlockToMarkCorrupt(storedBlock,
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"block is " + ucState + " and reported length " +
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reported.getNumBytes() + " does not match " +
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"length in block map " + storedBlock.getNumBytes());
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"length in block map " + storedBlock.getNumBytes(),
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Reason.SIZE_MISMATCH);
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} else {
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return null; // not corrupt
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}
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@ -2044,7 +2055,7 @@ assert storedBlock.findDatanode(dn) < 0 : "Block " + block
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return new BlockToMarkCorrupt(storedBlock, reportedGS,
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"reported " + reportedState + " replica with genstamp " + reportedGS
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+ " does not match COMPLETE block's genstamp in block map "
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+ storedBlock.getGenerationStamp());
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+ storedBlock.getGenerationStamp(), Reason.GENSTAMP_MISMATCH);
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} else { // COMPLETE block, same genstamp
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if (reportedState == ReplicaState.RBW) {
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// If it's a RBW report for a COMPLETE block, it may just be that
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@ -2057,7 +2068,8 @@ assert storedBlock.findDatanode(dn) < 0 : "Block " + block
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return null;
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} else {
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return new BlockToMarkCorrupt(storedBlock,
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"reported replica has invalid state " + reportedState);
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"reported replica has invalid state " + reportedState,
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Reason.INVALID_STATE);
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}
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}
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case RUR: // should not be reported
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@ -2068,7 +2080,7 @@ assert storedBlock.findDatanode(dn) < 0 : "Block " + block
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" on " + dn + " size " + storedBlock.getNumBytes();
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// log here at WARN level since this is really a broken HDFS invariant
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LOG.warn(msg);
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return new BlockToMarkCorrupt(storedBlock, msg);
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return new BlockToMarkCorrupt(storedBlock, msg, Reason.INVALID_STATE);
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}
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}
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@ -2184,6 +2196,11 @@ assert storedBlock.findDatanode(dn) < 0 : "Block " + block
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logAddStoredBlock(storedBlock, node);
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}
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} else {
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// if the same block is added again and the replica was corrupt
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// previously because of a wrong gen stamp, remove it from the
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// corrupt block list.
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corruptReplicas.removeFromCorruptReplicasMap(block, node,
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Reason.GENSTAMP_MISMATCH);
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curReplicaDelta = 0;
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blockLog.warn("BLOCK* addStoredBlock: "
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+ "Redundant addStoredBlock request received for " + storedBlock
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@ -2280,7 +2297,8 @@ assert storedBlock.findDatanode(dn) < 0 : "Block " + block
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DatanodeDescriptor[] nodesCopy = nodes.toArray(new DatanodeDescriptor[0]);
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for (DatanodeDescriptor node : nodesCopy) {
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try {
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if (!invalidateBlock(new BlockToMarkCorrupt(blk, null), node)) {
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if (!invalidateBlock(new BlockToMarkCorrupt(blk, null,
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Reason.ANY), node)) {
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removedFromBlocksMap = false;
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}
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} catch (IOException e) {
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@ -36,8 +36,18 @@ import java.util.*;
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@InterfaceAudience.Private
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public class CorruptReplicasMap{
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private SortedMap<Block, Collection<DatanodeDescriptor>> corruptReplicasMap =
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new TreeMap<Block, Collection<DatanodeDescriptor>>();
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/** The corruption reason code */
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public static enum Reason {
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NONE, // not specified.
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ANY, // wildcard reason
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GENSTAMP_MISMATCH, // mismatch in generation stamps
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SIZE_MISMATCH, // mismatch in sizes
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INVALID_STATE, // invalid state
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CORRUPTION_REPORTED // client or datanode reported the corruption
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}
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private SortedMap<Block, Map<DatanodeDescriptor, Reason>> corruptReplicasMap =
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new TreeMap<Block, Map<DatanodeDescriptor, Reason>>();
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/**
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* Mark the block belonging to datanode as corrupt.
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@ -48,9 +58,22 @@ public class CorruptReplicasMap{
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*/
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public void addToCorruptReplicasMap(Block blk, DatanodeDescriptor dn,
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String reason) {
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Collection<DatanodeDescriptor> nodes = getNodes(blk);
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addToCorruptReplicasMap(blk, dn, reason, Reason.NONE);
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}
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/**
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* Mark the block belonging to datanode as corrupt.
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*
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* @param blk Block to be added to CorruptReplicasMap
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* @param dn DatanodeDescriptor which holds the corrupt replica
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* @param reason a textual reason (for logging purposes)
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* @param reasonCode the enum representation of the reason
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*/
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public void addToCorruptReplicasMap(Block blk, DatanodeDescriptor dn,
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String reason, Reason reasonCode) {
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Map <DatanodeDescriptor, Reason> nodes = corruptReplicasMap.get(blk);
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if (nodes == null) {
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nodes = new TreeSet<DatanodeDescriptor>();
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nodes = new HashMap<DatanodeDescriptor, Reason>();
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corruptReplicasMap.put(blk, nodes);
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}
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@ -61,8 +84,7 @@ public class CorruptReplicasMap{
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reasonText = "";
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}
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if (!nodes.contains(dn)) {
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nodes.add(dn);
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if (!nodes.keySet().contains(dn)) {
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NameNode.blockStateChangeLog.info("BLOCK NameSystem.addToCorruptReplicasMap: "+
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blk.getBlockName() +
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" added as corrupt on " + dn +
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@ -76,6 +98,8 @@ public class CorruptReplicasMap{
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" by " + Server.getRemoteIp() +
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reasonText);
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}
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// Add the node or update the reason.
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nodes.put(dn, reasonCode);
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}
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/**
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@ -97,10 +121,24 @@ public class CorruptReplicasMap{
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false if the replica is not in the map
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*/
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boolean removeFromCorruptReplicasMap(Block blk, DatanodeDescriptor datanode) {
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Collection<DatanodeDescriptor> datanodes = corruptReplicasMap.get(blk);
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return removeFromCorruptReplicasMap(blk, datanode, Reason.ANY);
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}
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boolean removeFromCorruptReplicasMap(Block blk, DatanodeDescriptor datanode,
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Reason reason) {
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Map <DatanodeDescriptor, Reason> datanodes = corruptReplicasMap.get(blk);
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boolean removed = false;
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if (datanodes==null)
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return false;
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if (datanodes.remove(datanode)) { // remove the replicas
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// if reasons can be compared but don't match, return false.
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Reason storedReason = datanodes.get(datanode);
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if (reason != Reason.ANY && storedReason != null &&
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reason != storedReason) {
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return false;
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}
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if (datanodes.remove(datanode) != null) { // remove the replicas
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if (datanodes.isEmpty()) {
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// remove the block if there is no more corrupted replicas
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corruptReplicasMap.remove(blk);
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@ -118,7 +156,10 @@ public class CorruptReplicasMap{
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* @return collection of nodes. Null if does not exists
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*/
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Collection<DatanodeDescriptor> getNodes(Block blk) {
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return corruptReplicasMap.get(blk);
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Map <DatanodeDescriptor, Reason> nodes = corruptReplicasMap.get(blk);
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if (nodes == null)
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return null;
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return nodes.keySet();
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}
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/**
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|
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@ -5905,8 +5905,8 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
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}
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// Update old block with the new generation stamp and new length
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blockinfo.setGenerationStamp(newBlock.getGenerationStamp());
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blockinfo.setNumBytes(newBlock.getNumBytes());
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blockinfo.setGenerationStampAndVerifyReplicas(newBlock.getGenerationStamp());
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// find the DatanodeDescriptor objects
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final DatanodeManager dm = getBlockManager().getDatanodeManager();
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@ -26,10 +26,14 @@ import org.apache.hadoop.fs.Path;
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import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
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import org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException;
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import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocols;
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import org.apache.hadoop.hdfs.DFSConfigKeys;
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import org.apache.hadoop.io.IOUtils;
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import org.junit.Assert;
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import org.junit.Test;
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import org.mockito.Mockito;
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import org.mockito.stubbing.Answer;
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/**
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* This tests pipeline recovery related client protocol works correct or not.
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*/
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@ -112,4 +116,55 @@ public class TestClientProtocolForPipelineRecovery {
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cluster.shutdown();
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}
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}
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/** Test whether corrupt replicas are detected correctly during pipeline
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* recoveries.
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*/
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@Test
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public void testPipelineRecoveryForLastBlock() throws IOException {
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DFSClientFaultInjector faultInjector
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= Mockito.mock(DFSClientFaultInjector.class);
|
||||
DFSClientFaultInjector oldInjector = DFSClientFaultInjector.instance;
|
||||
DFSClientFaultInjector.instance = faultInjector;
|
||||
Configuration conf = new HdfsConfiguration();
|
||||
|
||||
conf.setInt(DFSConfigKeys.DFS_CLIENT_BLOCK_WRITE_LOCATEFOLLOWINGBLOCK_RETRIES_KEY, 3);
|
||||
MiniDFSCluster cluster = null;
|
||||
|
||||
try {
|
||||
int numDataNodes = 3;
|
||||
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDataNodes).build();
|
||||
cluster.waitActive();
|
||||
FileSystem fileSys = cluster.getFileSystem();
|
||||
|
||||
Path file = new Path("dataprotocol1.dat");
|
||||
Mockito.when(faultInjector.failPacket()).thenReturn(true);
|
||||
try {
|
||||
DFSTestUtil.createFile(fileSys, file, 1L, (short)numDataNodes, 0L);
|
||||
} catch (IOException e) {
|
||||
// completeFile() should fail.
|
||||
Assert.assertTrue(e.getMessage().startsWith("Unable to close file"));
|
||||
return;
|
||||
}
|
||||
|
||||
// At this point, NN let data corruption to happen.
|
||||
// Before failing test, try reading the file. It should fail.
|
||||
FSDataInputStream in = fileSys.open(file);
|
||||
try {
|
||||
int c = in.read();
|
||||
// Test will fail with BlockMissingException if NN does not update the
|
||||
// replica state based on the latest report.
|
||||
} catch (org.apache.hadoop.hdfs.BlockMissingException bme) {
|
||||
Assert.fail("Block is missing because the file was closed with"
|
||||
+ " corrupt replicas.");
|
||||
}
|
||||
Assert.fail("The file was closed with corrupt replicas, but read still"
|
||||
+ " works!");
|
||||
} finally {
|
||||
DFSClientFaultInjector.instance = oldInjector;
|
||||
if (cluster != null) {
|
||||
cluster.shutdown();
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -93,6 +93,10 @@ public class TestCorruptFilesJsp {
|
|||
in.close();
|
||||
}
|
||||
|
||||
try {
|
||||
Thread.sleep(3000); // Wait for block reports. They shouldn't matter.
|
||||
} catch (InterruptedException ie) {}
|
||||
|
||||
// verify if all corrupt files were reported to NN
|
||||
badFiles = namenode.getNamesystem().listCorruptFileBlocks("/", null);
|
||||
assertTrue("Expecting 3 corrupt files, but got " + badFiles.size(),
|
||||
|
|
|
|||
Loading…
Reference in New Issue