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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, 23 Aug 2012 21:24:42 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13440681#comment-13440681
] 

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

checksum type is only stored with blocks on dn. The only way to find out the type is to access
the block.
                
> 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-branch2-trunk.patch.txt, hdfs-3177-branch2-trunk.patch.txt,
hdfs-3177-branch2-trunk.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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