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) -- This message was sent by Atlassian JIRA (v6.3.15#6346) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-dev-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-dev-h...@hadoop.apache.org