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Date: Wed, 6 Jul 2011 04:50:16 +0000 (UTC)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HDFS-2130) Switch default checksum to CRC32C
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     [ https://issues.apache.org/jira/browse/HDFS-2130?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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

      Description: 
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.
    Fix Version/s:     (was: 0.23.0)

> 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
>
> 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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