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From "Todd Lipcon (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2130) Switch default checksum to CRC32C
Date Thu, 03 Nov 2011 00:37:32 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2130?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-2130:
------------------------------

       Resolution: Fixed
    Fix Version/s: 0.23.1
                   0.24.0
     Release Note: The default checksum algorithm used on HDFS is now CRC32C. Data from previous
versions of Hadoop can still be read backwards-compatibly.
     Hadoop Flags: Reviewed
           Status: Resolved  (was: Patch Available)

Committed to branch-0.23 for 0.23.1 (since .0 branched already). Committed to trunk.
                
> Switch default checksum to CRC32C
> ---------------------------------
>
>                 Key: HDFS-2130
>                 URL: https://issues.apache.org/jira/browse/HDFS-2130
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs client
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.24.0, 0.23.1
>
>         Attachments: hdfs-2130.txt, hdfs-2130.txt, hdfs-2130.txt
>
>
> Once the other subtasks/parts of HDFS-2080 are complete, CRC32C will be a much more efficient
checksum algorithm than CRC32. Hence we should change the default checksum to CRC32C.
> However, in order to continue to support append against blocks created with the old checksum,
we will need to implement some kind of handshaking in the write pipeline.

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