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Posted to hdfs-issues@hadoop.apache.org by "Jiandan Yang (JIRA)" <ji...@apache.org> on 2017/10/11 11:40:00 UTC
[jira] [Updated] (HDFS-12638) NameNode exit due to
ReplicationMonitor thread received Runtime exception in
[ https://issues.apache.org/jira/browse/HDFS-12638?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jiandan Yang updated HDFS-12638:
---------------------------------
Summary: NameNode exit due to ReplicationMonitor thread received Runtime exception in (was: NameNode exit due to NPE)
> NameNode exit due to ReplicationMonitor thread received Runtime exception in
> -----------------------------------------------------------------------------
>
> 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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