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https://issues.apache.org/jira/browse/HADOOP-10295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13884212#comment-13884212
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Kihwal Lee commented on HADOOP-10295:
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Thanks for working on this, Jing. One thing to note is that the block size
needs to be identical in addition to the checksum parameters in order for the
checksums to match. So it might make more sense to introduce an option to
preserve the two together.
> Allow distcp to automatically identify the checksum type of source files and
> use it for the target
> --------------------------------------------------------------------------------------------------
>
> Key: HADOOP-10295
> URL: https://issues.apache.org/jira/browse/HADOOP-10295
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 2.2.0
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Attachments: HADOOP-10295.000.patch, hadoop-10295.patch
>
>
> Currently while doing distcp, users can use "-Ddfs.checksum.type" to specify
> the checksum type in the target FS. This works fine if all the source files
> are using the same checksum type. If files in the source cluster have mixed
> types of checksum, users have to either use "-skipcrccheck" or have checksum
> mismatching exception. Thus we may need to consider adding a new option to
> distcp so that it can automatically identify the original checksum type of
> each source file and use the same checksum type in the target FS.
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