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https://issues.apache.org/jira/browse/HDFS-14147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16719602#comment-16719602
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ASF GitHub Bot commented on HDFS-14147:
---------------------------------------

GitHub user yzhou2001 opened a pull request:

    https://github.com/apache/hadoop/pull/446

    HDFS-14147: Back port of HDFS-13056 to the 2.9 branch

    

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/yzhou2001/hadoop branch-2.9

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/hadoop/pull/446.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #446
    
----
commit e5c3dda5cdfa376ea2ad3d9284f2f9b224ccd1df
Author: yzhou2001 <yazhou@...>
Date:   2018-12-13T00:09:46Z

    Back port of HDFS-13056 to the 2.9 branch

----


> Backport of HDFS-13056 to the 2.9 branch
> ----------------------------------------
>
>                 Key: HDFS-14147
>                 URL: https://issues.apache.org/jira/browse/HDFS-14147
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: datanode, distcp, hdfs
>    Affects Versions: 2.9.0, 2.9.1, 2.9.2
>            Reporter: Yan
>            Priority: Major
>
> HDFS-13056, Expose file-level composite CRCs in HDFS which are comparable 
> across different instances/layouts, is a significant feature for storage 
> agnostic CRC comparisons between HDFS and cloud object stores such as S3 and 
> GCS. With the extensively installed base of Hadoop 2, it should make a lot of 
> sense to have the feature in Hadoop 2.
> The plan is to start with the backporting to 2.9, followed by 2.8 and 2.7 in 
> that order.



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