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From "Vinayakumar B (JIRA)" <j...@apache.org>
Subject [jira] [Deleted] (HDFS-10148) CLONE - Erasure Coding: Fix NPE when NameNode processes over-replicated striped blocks
Date Tue, 15 Mar 2016 09:43:35 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10148?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vinayakumar B deleted HDFS-10148:
---------------------------------


> 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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