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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3177) Allow DFSClient to find out and use the CRC type being used for a file.
Date Thu, 16 Aug 2012 12:51:37 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13435935#comment-13435935
] 

Kihwal Lee commented on HDFS-3177:
----------------------------------

The new patch includes support for configurable mixed checksum mode for append (off by default)
and new/modified test cases. 
                
> Allow DFSClient to find out and use the CRC type being used for a file.
> -----------------------------------------------------------------------
>
>                 Key: HDFS-3177
>                 URL: https://issues.apache.org/jira/browse/HDFS-3177
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node, hdfs client
>    Affects Versions: 0.23.0
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>             Fix For: 2.1.0-alpha, 3.0.0
>
>         Attachments: hdfs-3177-after-hadoop-8239-8240.patch.txt, hdfs-3177.patch, hdfs-3177-with-hadoop-8239-8240.patch.txt
>
>
> To support HADOOP-8060, DFSClient should be able to find out the checksum type being
used for files in hdfs.
> In my prototype, DataTransferProtocol was extended to include the checksum type in the
blockChecksum() response. DFSClient uses it in getFileChecksum() to determin the checksum
type. Also append() can be configured to use the existing checksum type instead of the configured
one.

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