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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2656) Support for upgrading existing cluster to facilitate appends to HDFS files
Date Tue, 13 May 2008 23:23:55 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12596563#action_12596563
] 

dhruba borthakur commented on HADOOP-2656:
------------------------------------------

I plan on committing this patch tonight May 13th. This means that all existing clusters will
have to do an "-upgrade".

> 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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