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Jiandan Yang commented on HDFS-12638: -------------------------------------- I find another block with the same problem, and the auditlogs about the file to which the block blongs are as following. {code:java} 2017-10-13 03:26:59,198 INFO FSNamesystem.audit: allowed=true ugi=admin (auth:SIMPLE) ip=/xx.xxx.xx.xxx cmd=create src=/user/admin/ba13ed3a-898d-4b72-a873-1999da5f0a70 dst=null perm=admin:hadoop:rw-r--r-- proto=rpc 2017-10-13 03:26:59,290 INFO FSNamesystem.audit: allowed=true ugi=admin (auth:SIMPLE) ip=/xx.xxx.xx.xxx cmd=truncate src=/user/admin/ba13ed3a-898d-4b72-a873-1999da5f0a70 dst=null perm=admin:hadoop:rw-r--r-- proto=rpc 2017-10-13 03:26:59,293 INFO FSNamesystem.audit: allowed=true ugi=admin (auth:SIMPLE) ip=/xx.xxx.xx.xxx cmd=delete src=/user/admin/ba13ed3a-898d-4b72-a873-1999da5f0a70 dst=null perm=null proto=rpc {code} > NameNode exits due to ReplicationMonitor thread received Runtime exception in > ReplicationWork#chooseTargets > ----------------------------------------------------------------------------------------------------------- > > Key: HDFS-12638 > URL: https://issues.apache.org/jira/browse/HDFS-12638 > Project: Hadoop HDFS > Issue Type: Bug > Components: hdfs > Affects Versions: 2.8.2 > Reporter: Jiandan Yang > > Active NamNode exit due to NPE, I can confirm that the BlockCollection passed > in when creating ReplicationWork is null, but I do not know why > BlockCollection is null, By view history I found > [HDFS-9754|https://issues.apache.org/jira/browse/HDFS-9754] remove judging > whether BlockCollection is null. > NN logs are as following: > {code:java} > 2017-10-11 16:29:06,161 ERROR [ReplicationMonitor] > org.apache.hadoop.hdfs.server.blockmanagement.BlockManager: > ReplicationMonitor thread received Runtime exception. > java.lang.NullPointerException > at > org.apache.hadoop.hdfs.server.blockmanagement.ReplicationWork.chooseTargets(ReplicationWork.java:55) > at > org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReplicationWorkForBlocks(BlockManager.java:1532) > at > org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReplicationWork(BlockManager.java:1491) > at > org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeDatanodeWork(BlockManager.java:3792) > at > org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$ReplicationMonitor.run(BlockManager.java:3744) > at java.lang.Thread.run(Thread.java:834) > {code} -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org