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https://issues.apache.org/jira/browse/HDFS-8827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14938623#comment-14938623
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Hudson commented on HDFS-8827:
------------------------------
FAILURE: Integrated in Hadoop-Mapreduce-trunk-Java8 #465 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Java8/465/])
HDFS-8827. Erasure Coding: Fix NPE when NameNode processes (jing9: rev
fbf7e81ca007e009b492e3b99060bbfb74394f46)
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestAddOverReplicatedStripedBlocks.java
> 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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