HDFS-6960. Bugfix in LazyWriter, fix test case and some refactoring. (Arpit Agarwal)
This commit is contained in:
arp
parent
7e32be8768
commit
4cf9afacbe
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@ -24,3 +24,6 @@
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HDFS-6928. 'hdfs put' command should accept lazyPersist flag for testing.
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(Arpit Agarwal)
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HDFS-6960. Bugfix in LazyWriter, fix test case and some refactoring.
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(Arpit Agarwal)
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@ -271,10 +271,13 @@ File addBlock(Block b, File f) throws IOException {
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return blockFile;
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}
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File lazyPersistReplica(Block b, File f) throws IOException {
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File blockFile = FsDatasetImpl.copyBlockFiles(b, f, lazypersistDir);
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File metaFile = FsDatasetUtil.getMetaFile(blockFile, b.getGenerationStamp());
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dfsUsage.incDfsUsed(b.getNumBytes() + metaFile.length());
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File lazyPersistReplica(ReplicaInfo replicaInfo) throws IOException {
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if (!lazypersistDir.exists() && !lazypersistDir.mkdirs()) {
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FsDatasetImpl.LOG.warn("Failed to create " + lazypersistDir);
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}
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File metaFile = FsDatasetImpl.copyBlockFiles(replicaInfo, lazypersistDir);
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File blockFile = Block.metaToBlockFile(metaFile);
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dfsUsage.incDfsUsed(replicaInfo.getNumBytes() + metaFile.length());
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return blockFile;
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}
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@ -58,6 +58,7 @@
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import org.apache.hadoop.hdfs.server.datanode.DataBlockScanner;
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import org.apache.hadoop.hdfs.server.datanode.DataNode;
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import org.apache.hadoop.hdfs.server.datanode.DataStorage;
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import org.apache.hadoop.hdfs.server.datanode.DatanodeUtil;
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import org.apache.hadoop.hdfs.server.datanode.FinalizedReplica;
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import org.apache.hadoop.hdfs.server.datanode.Replica;
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import org.apache.hadoop.hdfs.server.datanode.ReplicaAlreadyExistsException;
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@ -565,28 +566,33 @@ static File moveBlockFiles(Block b, File srcfile, File destdir)
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return dstfile;
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}
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static File copyBlockFiles(Block b, File srcfile, File destdir)
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/**
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* Copy the block and meta files for the given block from the given
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* @return the new meta file.
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* @throws IOException
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*/
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static File copyBlockFiles(ReplicaInfo replicaInfo, File destRoot)
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throws IOException {
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final File dstfile = new File(destdir, b.getBlockName());
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final File srcmeta = FsDatasetUtil.getMetaFile(srcfile, b.getGenerationStamp());
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final File dstmeta = FsDatasetUtil.getMetaFile(dstfile, b.getGenerationStamp());
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final File destDir = DatanodeUtil.idToBlockDir(destRoot, replicaInfo.getBlockId());
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final File dstFile = new File(destDir, replicaInfo.getBlockName());
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final File dstMeta = FsDatasetUtil.getMetaFile(dstFile, replicaInfo.getGenerationStamp());
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final File srcMeta = replicaInfo.getMetaFile();
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final File srcFile = replicaInfo.getBlockFile();
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try {
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FileUtils.copyFile(srcmeta, dstmeta);
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FileUtils.copyFile(srcMeta, dstMeta);
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} catch (IOException e) {
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throw new IOException("Failed to copy meta file for " + b
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+ " from " + srcmeta + " to " + dstmeta, e);
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throw new IOException("Failed to copy " + srcMeta + " to " + dstMeta, e);
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}
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try {
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FileUtils.copyFile(srcfile, dstfile);
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FileUtils.copyFile(srcFile, dstFile);
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} catch (IOException e) {
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throw new IOException("Failed to copy block file for " + b
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+ " from " + srcfile + " to " + dstfile.getAbsolutePath(), e);
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throw new IOException("Failed to copy " + srcFile + " to " + dstFile, e);
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}
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if (LOG.isDebugEnabled()) {
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LOG.debug("addBlock: Moved " + srcmeta + " to " + dstmeta
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+ " and " + srcfile + " to " + dstfile);
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LOG.debug("addBlock: Moved " + srcMeta + " to " + dstMeta);
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LOG.debug("addBlock: Moved " + srcFile + " to " + dstFile);
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}
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return dstfile;
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return dstMeta;
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}
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static private void truncateBlock(File blockFile, File metaFile,
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@ -1174,10 +1180,6 @@ private synchronized FinalizedReplica finalizeReplica(String bpid,
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if (v.isTransientStorage()) {
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lazyWriteReplicaTracker.addReplica(bpid, replicaInfo.getBlockId(), v);
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// Schedule a checkpoint.
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((LazyWriter) lazyWriter.getRunnable())
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.addReplicaToLazyWriteQueue(bpid, replicaInfo.getBlockId());
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}
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}
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volumeMap.add(bpid, newReplicaInfo);
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@ -2188,32 +2190,12 @@ public void submitBackgroundSyncFileRangeRequest(ExtendedBlock block,
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nbytes, flags);
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}
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private static class BlockIdPair {
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final String bpid;
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final long blockId;
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BlockIdPair(final String bpid, final long blockId) {
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this.bpid = bpid;
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this.blockId = blockId;
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}
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}
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private class LazyWriter implements Runnable {
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class LazyWriter implements Runnable {
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private volatile boolean shouldRun = true;
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final int checkpointerInterval;
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final private Queue<BlockIdPair> blocksPendingCheckpoint;
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public LazyWriter(final int checkpointerInterval) {
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this.checkpointerInterval = checkpointerInterval;
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blocksPendingCheckpoint = new LinkedList<BlockIdPair>();
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}
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// Schedule a replica for writing to persistent storage.
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public synchronized void addReplicaToLazyWriteQueue(
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String bpid, long blockId) {
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LOG.info("Block with blockId=" + blockId + "; bpid=" + bpid + " added to lazy writer queue");
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blocksPendingCheckpoint.add(new BlockIdPair(bpid, blockId));
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}
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private void moveReplicaToNewVolume(String bpid, long blockId)
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@ -2221,76 +2203,85 @@ private void moveReplicaToNewVolume(String bpid, long blockId)
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LOG.info("LazyWriter invoked to save blockId=" + blockId + "; bpid=" + bpid);
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FsVolumeImpl targetVolume = null;
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Block block = null;
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File blockFile = null;
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FsVolumeImpl targetVolume;
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ReplicaInfo replicaInfo;
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synchronized (this) {
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block = getStoredBlock(bpid, blockId);
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blockFile = getFile(bpid, blockId);
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replicaInfo = volumeMap.get(bpid, blockId);
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if (block == null) {
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// The block was deleted before it could be checkpointed.
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if (replicaInfo == null || !replicaInfo.getVolume().isTransientStorage()) {
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// The block was either deleted before it could be checkpointed or
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// it is already on persistent storage. This can occur if a second
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// replica on persistent storage was found after the lazy write was
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// scheduled.
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return;
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}
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// Pick a target volume for the block.
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targetVolume = volumes.getNextVolume(
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StorageType.DEFAULT, block.getNumBytes());
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StorageType.DEFAULT, replicaInfo.getNumBytes());
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}
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if (LOG.isDebugEnabled()) {
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LOG.debug("LazyWriter starting to save blockId=" + blockId + "; bpid=" + bpid);
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}
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LOG.info("LazyWriter starting to save blockId=" + blockId + "; bpid=" + bpid);
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lazyWriteReplicaTracker.recordStartLazyPersist(bpid, blockId, targetVolume);
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File savedBlockFile = targetVolume.getBlockPoolSlice(bpid)
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.lazyPersistReplica(block, blockFile);
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.lazyPersistReplica(replicaInfo);
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lazyWriteReplicaTracker.recordEndLazyPersist(bpid, blockId, savedBlockFile);
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LOG.info("LazyWriter finished saving blockId=" + blockId + "; bpid=" + bpid +
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" to file " + savedBlockFile);
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if (LOG.isDebugEnabled()) {
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LOG.debug("LazyWriter finished saving blockId=" + blockId + "; bpid=" + bpid +
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" to file " + savedBlockFile);
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}
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}
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/**
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* Checkpoint a pending replica to persistent storage now.
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* If we fail then move the replica to the end of the queue.
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* @return true if there is more work to be done, false otherwise.
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*/
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private boolean saveNextReplica() {
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BlockIdPair blockIdPair = null;
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int moreWorkThreshold = 0;
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LazyWriteReplicaTracker.ReplicaState replicaState = null;
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boolean succeeded = false;
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try {
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synchronized (this) {
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// Dequeue the next replica waiting to be checkpointed.
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blockIdPair = blocksPendingCheckpoint.poll();
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if (blockIdPair == null) {
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LOG.info("LazyWriter has no blocks to persist. " +
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"Thread going to sleep.");
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replicaState = lazyWriteReplicaTracker.dequeueNextReplicaToPersist();
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if (replicaState == null) {
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return false;
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}
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}
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// Move the replica outside the lock.
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moveReplicaToNewVolume(blockIdPair.bpid, blockIdPair.blockId);
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moveReplicaToNewVolume(replicaState.bpid, replicaState.blockId);
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succeeded = true;
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} catch(IOException ioe) {
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// If we failed, put the block on the queue and let a retry
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// interval elapse before we try again so we don't try to keep
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// checkpointing the same block in a tight loop.
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synchronized (this) {
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blocksPendingCheckpoint.add(blockIdPair);
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++moreWorkThreshold;
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LOG.warn("Exception saving replica " + replicaState, ioe);
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} finally {
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if (!succeeded && replicaState != null) {
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lazyWriteReplicaTracker.reenqueueReplica(replicaState);
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}
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}
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synchronized (this) {
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return blocksPendingCheckpoint.size() > moreWorkThreshold;
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}
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return succeeded;
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}
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@Override
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public void run() {
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int numSuccessiveFailures = 0;
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while (fsRunning && shouldRun) {
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try {
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if (!saveNextReplica()) {
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numSuccessiveFailures = saveNextReplica() ? 0 : (numSuccessiveFailures + 1);
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// Sleep if we have no more work to do or if it looks like we are not
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// making any forward progress. This is to ensure that if all persist
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// operations are failing we don't keep retrying them in a tight loop.
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if (numSuccessiveFailures == lazyWriteReplicaTracker.numReplicasNotPersisted()) {
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Thread.sleep(checkpointerInterval * 1000);
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numSuccessiveFailures = 0;
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}
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} catch (InterruptedException e) {
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LOG.info("LazyWriter was interrupted, exiting");
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@ -255,22 +255,6 @@ void getVolumeMap(String bpid, ReplicaMap volumeMap) throws IOException {
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getBlockPoolSlice(bpid).getVolumeMap(volumeMap);
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}
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/**
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* Add replicas under the given directory to the volume map
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* @param volumeMap the replicas map
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* @param dir an input directory
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* @param isFinalized true if the directory has finalized replicas;
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* false if the directory has rbw replicas
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* @throws IOException
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*/
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void addToReplicasMap(String bpid, ReplicaMap volumeMap,
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File dir, boolean isFinalized) throws IOException {
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BlockPoolSlice bp = getBlockPoolSlice(bpid);
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// TODO move this up
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// dfsUsage.incDfsUsed(b.getNumBytes()+metaFile.length());
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bp.addToReplicasMap(volumeMap, dir, isFinalized);
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}
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@Override
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public String toString() {
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return currentDir.getAbsolutePath();
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@ -19,12 +19,11 @@
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package org.apache.hadoop.hdfs.server.datanode.fsdataset.impl;
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import com.google.common.collect.Multimap;
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import com.google.common.collect.TreeMultimap;
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import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi;
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import java.io.File;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.*;
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class LazyWriteReplicaTracker {
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@ -43,7 +42,7 @@ static class ReplicaState implements Comparable<ReplicaState> {
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/**
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* transient storage volume that holds the original replica.
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*/
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final FsVolumeImpl transientVolume;
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final FsVolumeSpi transientVolume;
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/**
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* Persistent volume that holds or will hold the saved replica.
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@ -51,7 +50,7 @@ static class ReplicaState implements Comparable<ReplicaState> {
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FsVolumeImpl lazyPersistVolume;
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File savedBlockFile;
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ReplicaState(final String bpid, final long blockId, FsVolumeImpl transientVolume) {
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ReplicaState(final String bpid, final long blockId, FsVolumeSpi transientVolume) {
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this.bpid = bpid;
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this.blockId = blockId;
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this.transientVolume = transientVolume;
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@ -60,6 +59,11 @@ static class ReplicaState implements Comparable<ReplicaState> {
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savedBlockFile = null;
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}
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@Override
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public String toString() {
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return "[Bpid=" + bpid + ";blockId=" + blockId + "]";
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}
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@Override
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public int hashCode() {
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return bpid.hashCode() ^ (int) blockId;
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@ -98,36 +102,44 @@ public int compareTo(ReplicaState other) {
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*/
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final Map<String, Map<Long, ReplicaState>> replicaMaps;
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/**
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* Queue of replicas that need to be written to disk.
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*/
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final Queue<ReplicaState> replicasNotPersisted;
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/**
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* A map of blockId to persist complete time for transient blocks. This allows
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* us to evict LRU blocks from transient storage. Protected by 'this'
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* Object lock.
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*/
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final Map<ReplicaState, Long> persistTimeMap;
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final Map<ReplicaState, Long> replicasPersisted;
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LazyWriteReplicaTracker(final FsDatasetImpl fsDataset) {
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this.fsDataset = fsDataset;
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replicaMaps = new HashMap<String, Map<Long, ReplicaState>>();
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persistTimeMap = new HashMap<ReplicaState, Long>();
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replicasNotPersisted = new LinkedList<ReplicaState>();
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replicasPersisted = new HashMap<ReplicaState, Long>();
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}
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TreeMultimap<Long, ReplicaState> getLruMap() {
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// TODO: This can be made more efficient.
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TreeMultimap<Long, ReplicaState> reversedMap = TreeMultimap.create();
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for (Map.Entry<ReplicaState, Long> entry : persistTimeMap.entrySet()) {
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for (Map.Entry<ReplicaState, Long> entry : replicasPersisted.entrySet()) {
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reversedMap.put(entry.getValue(), entry.getKey());
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}
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return reversedMap;
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}
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synchronized void addReplica(String bpid, long blockId,
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final FsVolumeImpl transientVolume) {
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final FsVolumeSpi transientVolume) {
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Map<Long, ReplicaState> map = replicaMaps.get(bpid);
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if (map == null) {
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map = new HashMap<Long, ReplicaState>();
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replicaMaps.put(bpid, map);
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}
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map.put(blockId, new ReplicaState(bpid, blockId, transientVolume));
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ReplicaState replicaState = new ReplicaState(bpid, blockId, transientVolume);
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map.put(blockId, replicaState);
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replicasNotPersisted.add(replicaState);
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}
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synchronized void recordStartLazyPersist(
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@ -149,12 +161,49 @@ synchronized void recordEndLazyPersist(
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}
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replicaState.state = State.LAZY_PERSIST_COMPLETE;
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replicaState.savedBlockFile = savedBlockFile;
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persistTimeMap.put(replicaState, System.currentTimeMillis() / 1000);
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if (replicasNotPersisted.peek() == replicaState) {
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// Common case.
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replicasNotPersisted.remove();
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} else {
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// Should never occur in practice as lazy writer always persists
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// the replica at the head of the queue before moving to the next
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// one.
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replicasNotPersisted.remove(replicaState);
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}
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replicasPersisted.put(replicaState, System.currentTimeMillis() / 1000);
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}
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synchronized ReplicaState dequeueNextReplicaToPersist() {
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while (replicasNotPersisted.size() != 0) {
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ReplicaState replicaState = replicasNotPersisted.remove();
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Map<Long, ReplicaState> replicaMap = replicaMaps.get(replicaState.bpid);
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if (replicaMap != null && replicaMap.get(replicaState.blockId) != null) {
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return replicaState;
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}
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// The replica no longer exists, look for the next one.
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}
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return null;
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}
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synchronized void reenqueueReplica(final ReplicaState replicaState) {
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replicasNotPersisted.add(replicaState);
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}
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synchronized int numReplicasNotPersisted() {
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return replicasNotPersisted.size();
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}
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synchronized void discardReplica(
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final String bpid, final long blockId, boolean force) {
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Map<Long, ReplicaState> map = replicaMaps.get(bpid);
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if (map == null) {
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return;
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}
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ReplicaState replicaState = map.get(blockId);
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if (replicaState == null) {
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@ -172,6 +221,9 @@ synchronized void discardReplica(
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}
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map.remove(blockId);
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persistTimeMap.remove(replicaState);
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replicasPersisted.remove(replicaState);
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// Leave the replica in replicasNotPersisted if its present.
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// dequeueNextReplicaToPersist will GC it eventually.
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}
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}
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@ -40,7 +40,9 @@
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import org.apache.hadoop.hdfs.MiniDFSCluster;
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import org.apache.hadoop.hdfs.StorageType;
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import org.apache.hadoop.hdfs.protocol.*;
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import org.apache.hadoop.hdfs.server.datanode.DataNode;
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import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
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import org.apache.hadoop.hdfs.server.datanode.DatanodeUtil;
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import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi;
|
||||
import org.apache.hadoop.hdfs.server.namenode.NameNode;
|
||||
import org.apache.hadoop.test.GenericTestUtils;
|
||||
|
|
@ -61,6 +63,7 @@ public class TestLazyPersistFiles {
|
|||
static {
|
||||
((Log4JLogger) NameNode.blockStateChangeLog).getLogger().setLevel(Level.ALL);
|
||||
((Log4JLogger) NameNode.stateChangeLog).getLogger().setLevel(Level.ALL);
|
||||
((Log4JLogger) FsDatasetImpl.LOG).getLogger().setLevel(Level.ALL);
|
||||
}
|
||||
|
||||
private static short REPL_FACTOR = 1;
|
||||
|
|
@ -68,7 +71,7 @@ public class TestLazyPersistFiles {
|
|||
private static final int LAZY_WRITE_FILE_SCRUBBER_INTERVAL_SEC = 3;
|
||||
private static final long HEARTBEAT_INTERVAL_SEC = 1;
|
||||
private static final int HEARTBEAT_RECHECK_INTERVAL_MSEC = 500;
|
||||
private static final int LAZY_WRITER_INTERVAL_SEC = 3;
|
||||
private static final int LAZY_WRITER_INTERVAL_SEC = 1;
|
||||
private static final int BUFFER_LENGTH = 4096;
|
||||
|
||||
private MiniDFSCluster cluster;
|
||||
|
|
@ -283,8 +286,9 @@ public void testLazyPersistBlocksAreSaved()
|
|||
File lazyPersistDir = volume.getBlockPoolSlice(bpid).getLazypersistDir();
|
||||
|
||||
for (LocatedBlock lb : locatedBlocks.getLocatedBlocks()) {
|
||||
File persistedBlockFile = new File(lazyPersistDir, "blk_" + lb.getBlock().getBlockId());
|
||||
if (persistedBlockFile.exists()) {
|
||||
File targetDir = DatanodeUtil.idToBlockDir(lazyPersistDir, lb.getBlock().getBlockId());
|
||||
File blockFile = new File(targetDir, lb.getBlock().getBlockName());
|
||||
if (blockFile.exists()) {
|
||||
// Found a persisted copy for this block!
|
||||
boolean added = persistedBlockIds.add(lb.getBlock().getBlockId());
|
||||
assertThat(added, is(true));
|
||||
|
|
|
|||
Loading…
Reference in New Issue