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Posted to hdfs-issues@hadoop.apache.org by "xupeng (JIRA)" <ji...@apache.org> on 2017/05/16 06:38:04 UTC
[jira] [Updated] (HDFS-11827) NPE is thrown when log level changed
in BlockPlacementPolicyDefault#chooseRandom() method
[ https://issues.apache.org/jira/browse/HDFS-11827?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
xupeng updated HDFS-11827:
--------------------------
Attachment: HDFS-11827.001.patch
> 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
> 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:
> 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)
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