[jira] Commented: (HADOOP-4778) Check for zero size block meta file when updating a block.

["Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-4778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653579#action_12653579 ] 

Tsz Wo (Nicholas), SZE commented on HADOOP-4778:
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{noformat}
     [exec] -1 overall.  

     [exec]     +1 @author.  The patch does not contain any @author tags.

     [exec]     -1 tests included.  The patch doesn't appear to include any new or modified tests.
     [exec]                         Please justify why no tests are needed for this patch.

     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.

     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs warnings.

     [exec]     +1 Eclipse classpath. The patch retains Eclipse classpath integrity.
{noformat}
The change is trivial.  No new tests added.

> Check for zero size block meta file when updating a block.
> ----------------------------------------------------------
>
>                 Key: HADOOP-4778
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4778
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>            Priority: Blocker
>             Fix For: 0.18.3
>
>         Attachments: 4769_20081203.patch, 4778_20081204.patch
>
>
> In case of datanode running out of disk space, block meta files may be created with zero length.  We should detect this obvious problem when updating a block.

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