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https://issues.apache.org/jira/browse/HDFS-2906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13202146#comment-13202146
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Uma Maheswara Rao G commented on HDFS-2906:
-------------------------------------------
Hey Brahma,
Is it reproducing for you reliably?
By looking at the trace, it seems to me that, the initialization order could
cause the problem. DataXicever servers are getting initialized first than
BlockPoolsManagers. So, FSDataSet might not be initialized but your are able
accept requests. Since you restarted the Node in 10mins itself, NN would have
not detected your DN shutdown. So, NN still give this deadDN adress to your
clients. When it is trying to write the block, it is throwing the NPE at
replicaInfo = datanode.data.createTemporary(block);.
Is this is the case for you?
> Null Pointer execption in blockreceiver
> ---------------------------------------
>
> 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
>
> Stared with NN two DN's and one DN is keep on restarting(for every 10mins)
> while write inprogress
> {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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