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https://issues.apache.org/jira/browse/HDFS-9190?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rushabh S Shah resolved HDFS-9190.
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Resolution: Duplicate
[~xyao]: thanks for pointing out to hdfs-8850
Closing this ticket as duplicate
> VolumeScanner throwing NPE while scanning suspect block.
> --------------------------------------------------------
>
> 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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