[jira] Resolved: (HDFS-812) FSNamesystem#internalReleaseLease throws NullPointerException on a single-block file's lease recovery

["Konstantin Boudnik (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-812?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Konstantin Boudnik resolved HDFS-812.
-------------------------------------

       Resolution: Fixed
    Fix Version/s: 0.22.0
                   0.21.0

I've ran all unit tests and all HDFS tests. All seemed Ok except for 4 testcases in TestHDFSFileContextMainOperations which have failed for unrelated reasons.

I've just committed this and merged back to branch-0.21.

> 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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