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https://issues.apache.org/jira/browse/HDFS-9124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14964219#comment-14964219
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Lei (Eddy) Xu commented on HDFS-9124:
-------------------------------------
Thanks a lot for reporting this, [~syedakram]. It looks like {{datanode.data}}
has not been initialized yet before receiving WRITE_BLOCK requests.
Did you see this particular DN restarts at that time?
> NullPointerException when underreplicated blocks are there
> ----------------------------------------------------------
>
> Key: HDFS-9124
> URL: https://issues.apache.org/jira/browse/HDFS-9124
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.7.1
> Reporter: Syed Akram
> Assignee: Syed Akram
>
> 2015-09-22 09:48:47,830 ERROR
> org.apache.hadoop.hdfs.server.datanode.DataNode: dn1:50010:DataXceiver error
> processing WRITE_BLOCK operation src: /dn1:42973 dst: /dn2:50010
> java.lang.NullPointerException
> at
> org.apache.hadoop.hdfs.server.datanode.BlockReceiver.<init>(BlockReceiver.java:186)
> at
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:677)
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:137)
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:74)
> at
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:251)
> at java.lang.Thread.run(Thread.java:744)
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