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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2797) Withdraw CRC upgrade from HDFS
Date Thu, 21 Feb 2008 18:35:19 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12571138#action_12571138
] 

Raghu Angadi commented on HADOOP-2797:
--------------------------------------


This is more than just removing BlockLevelCrcs. Hadoop needs a  'LAST_UPGRADABLE_LAYOUT_VERSION'
which is considered early during "version upgrade" (as opposed to distributed upgrade) because
when user tries to upgrade from very old version, NameNode and DataNode should exit before
making any changes to the existing diretories.


> Withdraw CRC upgrade from HDFS
> ------------------------------
>
>                 Key: HADOOP-2797
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2797
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: dfs
>    Affects Versions: 0.13.0
>            Reporter: Robert Chansler
>            Assignee: Raghu Angadi
>            Priority: Critical
>             Fix For: 0.17.0
>
>
> HDFS will no longer support upgrades from versions without CRCs for block data. Users
upgrading from version 0.13 or earlier must first upgrade to an intermediate (0.14, 0.15,
0.16) version before upgrade to 0.17 or later.

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