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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12638) NameNode exits due to ReplicationMonitor thread received Runtime exception in ReplicationWork#chooseTargets
Date Thu, 12 Oct 2017 15:19:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16202092#comment-16202092
] 

Daryn Sharp commented on HDFS-12638:
------------------------------------

It does differ from our case but likely has the same root cause.  The block was in your blocks
map, but not in ours.  The block existed on your DN, but not ours.  The commonality is the
block referenced a non-existent inode/collection.

> 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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