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https://issues.apache.org/jira/browse/HADOOP-2656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12591894#action_12591894
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Hadoop QA commented on HADOOP-2656:
-----------------------------------
+1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12380799/upgradeGenStamp8.patch
against trunk revision 645773.
@author +1. The patch does not contain any @author tags.
tests included +1. The patch appears to include 27 new or modified tests.
javadoc +1. The javadoc tool did not generate any warning messages.
javac +1. The applied patch does not generate any new javac compiler
warnings.
release audit +1. The applied patch does not generate any new release
audit warnings.
findbugs +1. The patch does not introduce any new Findbugs warnings.
core tests +1. The patch passed core unit tests.
contrib tests +1. The patch passed contrib unit tests.
Test results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2313/testReport/
Findbugs warnings:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2313/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2313/artifact/trunk/build/test/checkstyle-errors.html
Console output:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2313/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, upgradeGenStamp4.patch,
> upgradeGenStamp5.patch, upgradeGenStamp6.patch, upgradeGenStamp7.patch,
> upgradeGenStamp8.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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