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From "Kihwal Lee (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8060) Add a capability to use of consistent checksums for append and copy
Date Mon, 02 Apr 2012 20:13:22 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13244536#comment-13244536
] 

Kihwal Lee commented on HADOOP-8060:
------------------------------------

Created subtasks and specified dependency among them. HDFS-3176 should go in first to avoid
any breakage until the commit of the hdfs portions.

I will do more testing and add test cases. I will appreciate any feedback on the patches.
                
> Add a capability to use of consistent checksums for append and copy
> -------------------------------------------------------------------
>
>                 Key: HADOOP-8060
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8060
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs, util
>    Affects Versions: 0.23.0, 0.23.1, 0.24.0
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>             Fix For: 0.23.2, 0.24.0
>
>
> After the improved CRC32C checksum feature became default, some of use cases involving
data movement are no longer supported.  For example, when running DistCp to copy from a file
stored with the CRC32 checksum to a new cluster with the CRC32C set to default checksum, the
final data integrity check fails because of mismatch in checksums.

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