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Date: Tue, 6 May 2008 03:55:56 -0700 (PDT)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-2656) Support for upgrading existing
 cluster to facilitate appends to HDFS files
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    [ https://issues.apache.org/jira/browse/HADOOP-2656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12594545#action_12594545 ] 

Hadoop QA commented on HADOOP-2656:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12381480/upgradeGenStamp11.patch
  against trunk revision 653638.

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

    +1 tests included.  The patch appears to include 27 new or modified tests.

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

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

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

    +1 release audit.  The applied patch does not increase the total number of release audit warnings.

    -1 core tests.  The patch failed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2408/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2408/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2408/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2408/console

This message is automatically generated.

> Support for upgrading existing cluster to facilitate appends to HDFS files
> --------------------------------------------------------------------------
>
>                 Key: HADOOP-2656
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2656
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>             Fix For: 0.18.0
>
>         Attachments: upgradeGenStamp.patch, upgradeGenStamp10.patch, upgradeGenStamp11.patch, upgradeGenStamp4.patch, upgradeGenStamp5.patch, upgradeGenStamp6.patch, upgradeGenStamp7.patch, upgradeGenStamp8.patch, upgradeGenStamp9.patch, upgradeGenStamp9.patch
>
>
> HADOOP-1700 describes the design for supporting appends to HDFS files. This design requires a distributed-upgrade to existing cluster installations. The design specifies that the DataNode persist the 8-byte BlockGenerationStamp in the block metadata file. The upgrade code will introduce this new field in the block metadata file and initialize this value to 0.

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