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From "Sahil Takiar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13600) S3a rename() to copy files in a directory in parallel
Date Thu, 15 Dec 2016 18:47:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15752159#comment-15752159
] 

Sahil Takiar commented on HADOOP-13600:
---------------------------------------

[~stevel@apache.org], [~thodemoor]

Do you both have some more comments on the PR? https://github.com/apache/hadoop/pull/157

* What do you think of the approach I am taking? Anything missing?
* I started writing unit tests for {{S3AFileSystem.rename}}, which turned out to be much more
difficult that I thought; but I was able to get a basic unit test completed. Planning to add
some more testing, but wanted to make sure the approach was correct first.

> S3a rename() to copy files in a directory in parallel
> -----------------------------------------------------
>
>                 Key: HADOOP-13600
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13600
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 2.7.3
>            Reporter: Steve Loughran
>            Assignee: Sahil Takiar
>
> Currently a directory rename does a one-by-one copy, making the request O(files * data).
If the copy operations were launched in parallel, the duration of the copy may be reducable
to the duration of the longest copy. For a directory with many files, this will be significant



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