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From "Rushabh S Shah (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-9190) VolumeScanner throwing NPE while scanning suspect block.
Date Fri, 02 Oct 2015 17:19:26 GMT

     [ https://issues.apache.org/jira/browse/HDFS-9190?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rushabh S Shah updated HDFS-9190:
---------------------------------
    Summary: VolumeScanner throwing NPE while scanning suspect block.  (was: VolumeScanner
throwing NPE while scanning suspect blocks.)

> 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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