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From "Tsz Wo (Nicholas), SZE (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 Wed, 22 Aug 2012 23:24:43 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13439938#comment-13439938
] 

Tsz Wo (Nicholas), SZE commented on HDFS-3177:
----------------------------------------------

Hi Kihwal, thank you for the answers.  Let's disallow append with different checksum types
and remove the conf property for the moment.  We could add it if we find it useful later.

concat() is tricky.  It seems that we have to allow concat with different checksum types since
checksum is invisible to users.  Fortunately, this should not a common case: concat is usually
used with distcp and all blocks should be created with the same checksum type.
                
> 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-after-hadoop-8239.patch.txt,
hdfs-3177-branch2-trunk.patch.txt, hdfs-3177.patch, hdfs-3177-with-hadoop-8239-8240.patch.txt,
hdfs-3177-with-hadoop-8239-8240.patch.txt, hdfs-3177-with-hadoop-8239-8240.patch.txt, hdfs-3177-with-hadoop-8239.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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