Andrew Olson created HADOOP-16047:
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Summary: 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
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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