Andrew Olson reassigned HADOOP-16047:

    Assignee: Andrew Olson

> Avoid expensive rename when DistCp is writing to S3
> ---------------------------------------------------
>                 Key: HADOOP-16047
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16047
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs/s3, tools/distcp
>            Reporter: Andrew Olson
>            Assignee: Andrew Olson
>            Priority: Major
> When writing to an S3-based target, the temp file and rename logic in 
> RetriableFileCopyCommand adds some unnecessary cost to the job, as the rename 
> operation does a server-side copy + delete in S3 [1]. The renames are 
> parallelized across all of the DistCp map tasks, so the severity is mitigated 
> to some extent. However a configuration property to conditionally allow 
> distributed copies to avoid that expense and write directly to the target 
> path would improve performance considerably.
> [1] 
> https://github.com/apache/hadoop/blob/release-3.2.0-RC1/hadoop-common-project/hadoop-common/src/site/markdown/filesystem/introduction.md#object-stores-vs-filesystems

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