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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-2656) Support for upgrading existing cluster to facilitate appends to HDFS files
Date Mon, 21 Apr 2008 21:01:22 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-2656?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

dhruba borthakur updated HADOOP-2656:
-------------------------------------

    Attachment: upgradeGenStamp.patch

Incorporates most of Konstantin's comments. I left the definition of BlockTwo just because
I think it is cleaner this way. Also, the reason some code is duplicated between BlockCrcUpgrade
and BlockGenerationStampUpgrade is because the BlockCrcUpgrade code might probably go away
in the next release or so.

> 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
>
>
> 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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