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https://issues.apache.org/jira/browse/HDFS-5077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13736711#comment-13736711
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Vinay commented on HDFS-5077:
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Rare to occur, If the removed DN have responded successfully during recovery,
then definitely some problem at DN side in reporting to active NN.
One possible problem in case of HA is HDFS-5014
> NPE in FSNamesystem.commitBlockSynchronization()
> ------------------------------------------------
>
> Key: HDFS-5077
> URL: https://issues.apache.org/jira/browse/HDFS-5077
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.0.5-alpha
> Reporter: Konstantin Shvachko
>
> NN starts a block recovery, which will synchronize block replicas on
> different DNs. In the end one of DNs will report the list of the nodes
> containing the consistent replicas to the NN via commitBlockSynchronization()
> call. The NPE happens if just before processing commitBlockSynchronization()
> NN removes from active one of DNs that are then reported in the call.
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