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https://issues.apache.org/jira/browse/HDFS-8827?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao updated HDFS-8827:
----------------------------
Resolution: Fixed
Hadoop Flags: Reviewed
Fix Version/s: HDFS-7285
Status: Resolved (was: Patch Available)
I've committed this. Thanks for the contribution, [~walter.k.su] and
[~tfukudom]!
> Erasure Coding: Fix NPE when NameNode processes over-replicated striped blocks
> ------------------------------------------------------------------------------
>
> Key: HDFS-8827
> URL: https://issues.apache.org/jira/browse/HDFS-8827
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Takuya Fukudome
> Assignee: Walter Su
> Fix For: HDFS-7285
>
> Attachments: HDFS-8827-HDFS-7285.04.patch,
> HDFS-8827-HDFS-7285.05.patch, HDFS-8827.1.patch, HDFS-8827.2.patch,
> HDFS-8827.3.patch, processing-over-replica-npe.log
>
>
> In our test cluster, when namenode processed over replicated striped blocks,
> null pointer exception(NPE) occurred. This happened under below situation: 1)
> some datanodes shutdown. 2) namenode recovers block group which lost internal
> blocks. 3) restart the stopped datanodes. 4) namenode processes over
> replicated striped blocks. 5) NPE occurs
> I think BlockPlacementPolicyDefault#chooseReplicaToDelete will return null in
> this situation which causes this NPE problem.
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