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Date: Mon, 28 Apr 2008 16:19:55 -0700 (PDT)
From: "dhruba borthakur (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Updated: (HADOOP-2656) Support for upgrading existing
 cluster to facilitate appends to HDFS files
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     [ https://issues.apache.org/jira/browse/HADOOP-2656?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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

    Status: Open  (was: Patch Available)

> 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, 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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