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https://issues.apache.org/jira/browse/HDFS-2906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13202168#comment-13202168
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Brahma Reddy Battula commented on HDFS-2906:
--------------------------------------------
HI Uma,
Thanks for analysis.Seems to same happening.
It's always able reprodcue by executing mentioned scenario..
> NullPointerExeception in BlockReceiver on DataNode restart.
> -----------------------------------------------------------
>
> Key: HDFS-2906
> URL: https://issues.apache.org/jira/browse/HDFS-2906
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node
> Affects Versions: 0.23.0
> Reporter: Brahma Reddy Battula
> Assignee: Uma Maheswara Rao G
>
> Scenario:
> 1) Start the cluster with one NN and two DN's.
> 2) Keep restart one DN for every 10mins.
> 3) Let's keep the clients to write the data continuosly.
> Observed below trace.
> {noformat}
> 2012-02-07 01:03:45,897 ERROR
> org.apache.hadoop.hdfs.server.datanode.DataNode:
> HOST-10-18-40-23:50010:DataXceiver error processing WRITE_BLOCK operation
> src: /10.18.40.20:23862 dest: /10.18.40.23:50010
> java.lang.NullPointerException
> at
> org.apache.hadoop.hdfs.server.datanode.BlockReceiver.<init>(BlockReceiver.java:151)
> at
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:340)
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:98)
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:66)
> at
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:167)
> at java.lang.Thread.run(Thread.java:619)
> 2012-02-07 01:03:46,083 INFO org.apache.hadoop.hdfs.server.common.Storage:
> Locking is disabled
> {noformat}
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