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From "Jiandan Yang (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HDFS-12638) NameNode exits due to ReplicationMonitor thread received Runtime exception in ReplicationWork#chooseTargets
Date Mon, 16 Oct 2017 11:16:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16205739#comment-16205739
] 

Jiandan Yang  edited comment on HDFS-12638 at 10/16/17 11:15 AM:
-----------------------------------------------------------------

Doing truncate & delete files when cluster is RollingUpgrade leads to orphans blocks.
I add an ut in patch to reproduce the problem.


was (Author: yangjiandan):
Doing truncate & delete files when cluster is RollingUpgrade leads to orphans blocks.
I add a ut in patch to reproduce the problem.

> 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 
>         Attachments: HDFS-12638-branch-2.8.2.001.patch
>
>
> 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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