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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8239) Extend MD5MD5CRC32FileChecksum to show the actual checksum type being used
Date Tue, 21 Aug 2012 05:05:38 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13438456#comment-13438456

Kihwal Lee commented on HADOOP-8239:

bq. MD5MD5CRC32GzipFileChecksum and MD5MD5CRC32CastagnoliFileChecksum should not have the
following fields. 
The last patch is supposed to fix this, but the files were not added. Sorry about that.

bq. DataChecksum.MIXED is not used. What do we need it? Could we add it later?
Any file system implementation that's using MD5MD5CRC32FileChecksum will need it, a file can
contain blocks with different checksum types. This is not desired, but at least we should
be able to detect it. So I think it belongs here and will be used by HDFS-3177.

I will post the corrected patch.
> Extend MD5MD5CRC32FileChecksum to show the actual checksum type being used
> --------------------------------------------------------------------------
>                 Key: HADOOP-8239
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8239
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>             Fix For: 2.1.0-alpha
>         Attachments: hadoop-8239-after-hadoop-8240.patch.txt, hadoop-8239-after-hadoop-8240.patch.txt,
hadoop-8239-before-hadoop-8240.patch.txt, hadoop-8239-before-hadoop-8240.patch.txt, hadoop-8239-trunk-branch2.patch.txt,
> In order to support HADOOP-8060, MD5MD5CRC32FileChecksum needs to be extended to carry
the information on the actual checksum type being used. The interoperability between the extended
version and branch-1 should be guaranteed when Filesystem.getFileChecksum() is called over
hftp, webhdfs or httpfs.

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