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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8827) Erasure Coding: Fix NPE when NameNode processes over-replicated striped blocks
Date Fri, 07 Aug 2015 17:47:46 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14662143#comment-14662143
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Jing Zhao commented on HDFS-8827:
---------------------------------

+1. I will commit it shortly.

> 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
>         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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