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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2797) Withdraw CRC upgrade from HDFS
Date Mon, 28 Apr 2008 20:51:55 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12592892#action_12592892
] 

dhruba borthakur commented on HADOOP-2797:
------------------------------------------

+1. Code looks good.

One option would be to keep the existing test and ensure that it *fails*. This will test that
if anybody tries to upgrade an old version, then the upgrade will fail.

> 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
>         Attachments: HADOOP-2797.patch, HADOOP-2797.patch
>
>
> 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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