Rushabh S Shah created HDFS-9190:
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Summary: VolumeScanner throwing NPE while scanning suspect blocks.
Key: HDFS-9190
URL: https://issues.apache.org/jira/browse/HDFS-9190
Project: Hadoop HDFS
Issue Type: Bug
Components: HDFS
Affects Versions: 2.7.0
Reporter: Rushabh S Shah
Priority: Critical
Volume scanner NPEs while scanning suspect Block.
Following is the stack trace:
{noformat}
2015-10-02 06:45:30,333 [VolumeScannerThread(dataDir)] ERROR
datanode.VolumeScanner: VolumeScanner(dataDir,
DS-5fc4263e-7a5c-4463-9f82-842108c0ab3b) exiting because of exception
java.lang.NullPointerException
at
org.apache.hadoop.hdfs.server.datanode.VolumeScanner.runLoop(VolumeScanner.java:539)
at
org.apache.hadoop.hdfs.server.datanode.VolumeScanner.run(VolumeScanner.java:619)
2015-10-02 06:45:30,333
[org.apache.hadoop.hdfs.server.datanode.DataNode$DataTransfer@7768ca5] WARN
datanode.DataNode: DatanodeRegistration(sourceDN:1004,
datanodeUuid=f554982f-7c45-4fd4-ad57-9d472a39729e, infoPort=1006,
infoSecurePort=0, ipcPort=8020,
storageInfo=lv=-56;cid=CID-ddc217ab-5203-48ef-9695-a348feb4dac2;nsid=1872110141;c=1443758672580):Failed
to transfer BP-1749317823-<nnIp>-1443758669533:blk_1073742231_1407 to
destDN:1004 got
java.net.SocketException: Original Exception : java.io.IOException: Connection
reset by peer
at sun.nio.ch.FileChannelImpl.transferTo0(Native Method)
at
sun.nio.ch.FileChannelImpl.transferToDirectly(FileChannelImpl.java:443)
at sun.nio.ch.FileChannelImpl.transferTo(FileChannelImpl.java:575)
at
org.apache.hadoop.net.SocketOutputStream.transferToFully(SocketOutputStream.java:223)
at
org.apache.hadoop.hdfs.server.datanode.BlockSender.sendPacket(BlockSender.java:579)
at
org.apache.hadoop.hdfs.server.datanode.BlockSender.doSendBlock(BlockSender.java:759)
at
org.apache.hadoop.hdfs.server.datanode.BlockSender.sendBlock(BlockSender.java:706)
at
org.apache.hadoop.hdfs.server.datanode.DataNode$DataTransfer.run(DataNode.java:2124)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: Connection reset by peer
... 9 more
{noformat}
It is NPEing at the code in file: VolumeScanner#runLoop
{noformat}
long saveDelta = monotonicMs - curBlockIter.getLastSavedMs();
{noformat}
curBlockIter is not initialized.
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