[jira] [Resolved] (HDFS-3701) HDFS may miss the final block when reading a file opened for writing if one of the datanode is dead

["Uma Maheswara Rao G (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-3701?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Uma Maheswara Rao G resolved HDFS-3701.
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       Resolution: Fixed
    Fix Version/s: 1.1.0

I have just committed to branch-1, Committed revision 1389678.
Have not seen any new failure in my env with this path.

Thanks a lot Nicolas for your contribution in this issue and closer track on it.

Thanks a lot to Nicholas for your reviews!
                
> HDFS may miss the final block when reading a file opened for writing if one of the datanode is dead
> ---------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-3701
>                 URL: https://issues.apache.org/jira/browse/HDFS-3701
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>    Affects Versions: 1.0.3
>            Reporter: nkeywal
>            Assignee: nkeywal
>            Priority: Critical
>             Fix For: 1.1.0
>
>         Attachments: HDFS-3701.branch-1.v2.merged.patch, HDFS-3701.branch-1.v3.patch, HDFS-3701.branch-1.v4.patch, HDFS-3701.ontopof.v1.patch, HDFS-3701.patch
>
>
> When the file is opened for writing, the DFSClient calls one of the datanode owning the last block to get its size. If this datanode is dead, the socket exception is shallowed and the size of this last block is equals to zero. This seems to be fixed on trunk, but I didn't find a related Jira. On 1.0.3, it's not fixed. It's on the same area as HDFS-1950 or HDFS-3222.

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