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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HADOOP-15577) Update distcp to use zero-rename s3 committers
Date Tue, 03 Jul 2018 14:21:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-15577?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steve Loughran resolved HADOOP-15577.
-------------------------------------
    Resolution: Duplicate

We don't need the 0-rename stuff, because distcp, except in the --atomic mode, isn't trying
to do atomic operations.

What we do need, is for distcp to not upload to a temp file and rename each one into place:
remove that and for non-atomic uploads you eliminate the O(data) delay after each upload.

Closing as a duplicate of that. *as that JIRA has no code/tests, I would support anyone who
sat down to do implement the feature*

There's also lots of work going on with HDFS to have an explicit multipart upload mechanism
for filesystems, which can be used for a block-by-block upload to S3, this would improve distcp
upload perf on files in HDFS > 1 block, as the blocks could be uploaded in parallel with
locality. Keep an eye on that

> Update distcp to use zero-rename s3 committers
> ----------------------------------------------
>
>                 Key: HADOOP-15577
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15577
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs/s3, tools/distcp
>    Affects Versions: 3.1.0
>            Reporter: Tim Sammut
>            Priority: Major
>
> Hello!
> distcp through 3.1.0 appears to copy files and then rename them into their final/destination
filename. https://issues.apache.org/jira/browse/HADOOP-13786 added support for more efficient
S3 committers that do not use renames. 
> Please update distcp to use these efficient committers and no renames. 
> Thanks!



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