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HDFS-7383. DataNode.requestShortCircuitFdsForRead may throw NullPointerException. Contributed by Tsz Wo Nicholas Sze.

This commit is contained in:
Suresh Srinivas 2014-11-09 17:55:03 -08:00
parent 9e63cb4492
commit d4f2e791a5
4 changed files with 27 additions and 3 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -155,6 +155,9 @@ Release 2.7.0 - UNRELEASED
HDFS-7366. BlockInfo should take replication as an short in the constructor.
(Li Lu via wheat9)
HDFS-7383. DataNode.requestShortCircuitFdsForRead may throw
NullPointerException. (szetszwo via suresh)
Release 2.6.0 - UNRELEASED
INCOMPATIBLE CHANGES

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
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@ -1550,7 +1550,7 @@ public class DataNode extends ReconfigurableBase
try {
fis[0] = (FileInputStream)data.getBlockInputStream(blk, 0);
fis[1] = (FileInputStream)data.getMetaDataInputStream(blk).getWrappedStream();
fis[1] = DatanodeUtil.getMetaDataInputStream(blk, data);
} catch (ClassCastException e) {
LOG.debug("requestShortCircuitFdsForRead failed", e);
throw new ShortCircuitFdsUnsupportedException("This DataNode's " +

21
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DatanodeUtil.java
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@ -18,10 +18,15 @@
package org.apache.hadoop.hdfs.server.datanode;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsDatasetSpi;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.LengthInputStream;
/** Provide utility methods for Datanode. */
@InterfaceAudience.Private
@ -114,4 +119,20 @@ public class DatanodeUtil {
DataStorage.BLOCK_SUBDIR_PREFIX + d2;
return new File(root, path);
}
/**
* @return the FileInputStream for the meta data of the given block.
* @throws FileNotFoundException
* if the file not found.
* @throws ClassCastException
* if the underlying input stream is not a FileInputStream.
*/
public static FileInputStream getMetaDataInputStream(
ExtendedBlock b, FsDatasetSpi<?> data) throws IOException {
final LengthInputStream lin = data.getMetaDataInputStream(b);
if (lin == null) {
throw new FileNotFoundException("Meta file for " + b + " not found.");
}
return (FileInputStream)lin.getWrappedStream();
}
}

4
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetCache.java
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@ -51,6 +51,7 @@ import org.apache.hadoop.hdfs.ExtendedBlockId;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.protocol.BlockListAsLongs;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.server.datanode.DatanodeUtil;
import org.apache.hadoop.io.nativeio.NativeIO;
import org.apache.hadoop.util.Time;
import org.slf4j.Logger;
@ -373,8 +374,7 @@ public class FsDatasetCache {
reservedBytes = true;
try {
blockIn = (FileInputStream)dataset.getBlockInputStream(extBlk, 0);
metaIn = (FileInputStream)dataset.getMetaDataInputStream(extBlk)
.getWrappedStream();
metaIn = DatanodeUtil.getMetaDataInputStream(extBlk, dataset);
} catch (ClassCastException e) {
LOG.warn("Failed to cache " + key +
": Underlying blocks are not backed by files.", e);