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https://issues.apache.org/jira/browse/BEAM-5036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16596548#comment-16596548
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Reuven Lax commented on BEAM-5036:
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[~sinisa_lyh] I don't think there is any semantically-correct way to write
directly to final files (unless you're ok with incomplete or corrupted output),
and I don't think Beam ever did that. If workers crash, etc. you'll end up with
partially-written files. What's more, there's no guarantee that a retry will
write the exact same data in the files.
> Optimize FileBasedSink's WriteOperation.moveToOutput()
> ------------------------------------------------------
>
> Key: BEAM-5036
> URL: https://issues.apache.org/jira/browse/BEAM-5036
> Project: Beam
> Issue Type: Improvement
> Components: io-java-files
> Affects Versions: 2.5.0
> Reporter: Jozef Vilcek
> Assignee: Tim Robertson
> Priority: Major
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> moveToOutput() methods in FileBasedSink.WriteOperation implements move by
> copy+delete. It would be better to use a rename() which can be much more
> effective for some filesystems.
> Filesystem must support cross-directory rename. BEAM-4861 is related to this
> for the case of HDFS filesystem.
> Feature was discussed here:
> http://mail-archives.apache.org/mod_mbox/beam-dev/201807.mbox/%3CCAF9t7_4Mp54pQ+vRrJrBh9Vx0=uaknupzd_qdh_qdm9vxll...@mail.gmail.com%3E
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