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https://issues.apache.org/jira/browse/HADOOP-2656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12594471#action_12594471
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dhruba borthakur commented on HADOOP-2656:
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I would like to commit this patch earlier rather than later, especially because
it is a disk format change needed for supporting "appends" to files. Please let
me know (before EOB May 6th) if anybody thinks that I should hold off checking
in this patch.
> 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,
> 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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