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https://issues.apache.org/jira/browse/HDFS-10148?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinayakumar B deleted HDFS-10148:
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> CLONE - Erasure Coding: Fix NPE when NameNode processes over-replicated
> striped blocks
> --------------------------------------------------------------------------------------
>
> Key: HDFS-10148
> URL: https://issues.apache.org/jira/browse/HDFS-10148
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: dragon
> Assignee: Walter Su
>
> 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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