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https://issues.apache.org/jira/browse/HADOOP-2656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12589793#action_12589793
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Konstantin Shvachko commented on HADOOP-2656:
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Am I correct that only the last block in a file need to have generation stamp?
In that case generationStamp should be a member of INodeFile rather than Block.
It should also be a part LocatedBlock so that clients had the same api to work
with blocks.
> 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: upgradeGenStamp4.patch, upgradeGenStamp5.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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