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https://issues.apache.org/jira/browse/HDFS-12638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16203501#comment-16203501
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Jiandan Yang commented on HDFS-12638:
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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}
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