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https://issues.apache.org/jira/browse/HDFS-812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12791196#action_12791196
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Konstantin Boudnik commented on HDFS-812:
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I forgot to mention that this JIRA doesn't have results of test-patch because
the build has been broken because of HDFS-832.
> FSNamesystem#internalReleaseLease throws NullPointerException on a
> single-block file's lease recovery
> -----------------------------------------------------------------------------------------------------
>
> Key: HDFS-812
> URL: https://issues.apache.org/jira/browse/HDFS-812
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 0.21.0, 0.22.0
> Reporter: Konstantin Boudnik
> Assignee: Konstantin Boudnik
> Priority: Blocker
> Fix For: 0.21.0, 0.22.0
>
> Attachments: HDFS-812.patch, HDFS-812.patch, HDFS-812.patch,
> HDFS-812.patch, HDFS-812.patch
>
>
> {{FSNamesystem.internalReleaseLease()}} uses the result of
> {{iFile#numBlocks();}} call to get a number of an under construction file's
> blocks. {{numBlock()}} can return 0 if the file doesn't have any blocks yet.
> This will cause {{internalReleaseLease()}} to throw
> ArrayIndexOutOfBoundException.
> In case of a single block file, the same method will throw
> NullPointerException because the penultimate block is going to be null
> according to the logic of INodeFile#getPenultimateBlock().
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