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Posted to common-issues@hadoop.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2018/07/03 14:21:00 UTC
[jira] [Resolved] (HADOOP-15577) Update distcp to use zero-rename
s3 committers
[ 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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