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https://issues.apache.org/jira/browse/HDFS-11827?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arpit Agarwal reassigned HDFS-11827:
------------------------------------
Assignee: xupeng
> NPE is thrown when log level changed in
> BlockPlacementPolicyDefault#chooseRandom() method
> ------------------------------------------------------------------------------------------
>
> Key: HDFS-11827
> URL: https://issues.apache.org/jira/browse/HDFS-11827
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.6.0
> Environment: hadoop-version: 2.6.0-cdh5.4.4
> Reporter: xupeng
> Assignee: xupeng
> Attachments: HDFS-11827.001.patch
>
>
> This issue was found by my colleague when changing log-level of
> BlockPlacementPolicy using "hadoop daemonlog" command.
> The exception stack trace is below:
> {noformat}
> 2017-05-16 13:36:51,053 ERROR
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager:
> ReplicationMonitor thread received Runtime exception.
> java.lang.NullPointerException
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseRandom(BlockPlacementPolicyDefault.java:666)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseRemoteRack(BlockPlacementPolicyDefault.java:607)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseTarget(BlockPlacementPolicyDefault.java:375)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseTarget(BlockPlacementPolicyDefault.java:446)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseTarget(BlockPlacementPolicyDefault.java:446)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseTarget(BlockPlacementPolicyDefault.java:240)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseTarget(BlockPlacementPolicyDefault.java:119)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyWithMultiDC.chooseTargetInternal(BlockPlacementPolicyWithMultiDC.java:263)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyWithMultiDC.chooseTarget(BlockPlacementPolicyWithMultiDC.java:214)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$ReplicationWork.chooseTargets(BlockManager.java:3836)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$ReplicationWork.access$200(BlockManager.java:3801)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReplicationWorkForBlocks(BlockManager.java:1394)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReplicationWork(BlockManager.java:1300)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeDatanodeWork(BlockManager.java:3764)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$ReplicationMonitor.run(BlockManager.java:3711)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
> After checking _BlockPlacementPolicyDefault_ code of trunk, I found that
> _BlockPlacementPolicyDefault_ class missed some NPE check code in
> _chooseRandom()_ method.
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