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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2130) Switch default checksum to CRC32C
Date Wed, 02 Nov 2011 19:57:32 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13142459#comment-13142459
] 

Todd Lipcon commented on HDFS-2130:
-----------------------------------

Right. The patch as attached now implements #2 - the DN recalculates to match the on-disk
checksum format. It only supports switching checksum algorithm -- number of checksum bytes
has to be the same, since that determines packet sizes, etc, and would be a more complicated
patch. Nothing stopping us from addressing it later, but it's not the pressing need.
                
> 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
>         Attachments: 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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