[jira] [Updated] (HADOOP-10295) Allow distcp to automatically identify the checksum type of source files and use it for the target

["Jing Zhao (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-10295?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jing Zhao updated HADOOP-10295:
-------------------------------

    Attachment: HADOOP-10295.000.patch

Initial patch for review. The patch adds a "-preservechecksumtype" option to distcp. If the option is set, it simply checks the checksum type for each source file and uses it for creating the corresponding temp file in the target FS.

Still need to add unit tests and do some system tests.

> 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
>
>
> 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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