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https://issues.apache.org/jira/browse/HADOOP-2656?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Chansler updated HADOOP-2656:
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Release Note: Associated a generation stamp with each block. On data nodes,
the generation stamp is stored as part of the file name of the block's
meta-data file. (was: The "append" feature requires that generation stamps be
associated with data in the block. This issue associates a generation stamp
with each block file on the datanodes.)
Hadoop Flags: [Incompatible change, Reviewed] (was: [Reviewed,
Incompatible change])
> 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, upgradeGenStamp12.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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