xupeng created HDFS-11827:
-----------------------------
Summary: 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
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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