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https://issues.apache.org/jira/browse/HADOOP-17833?focusedWorklogId=782313&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-782313
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ASF GitHub Bot logged work on HADOOP-17833:
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Author: ASF GitHub Bot
Created on: 17/Jun/22 08:48
Start Date: 17/Jun/22 08:48
Worklog Time Spent: 10m
Work Description: steveloughran commented on PR #3289:
URL: https://github.com/apache/hadoop/pull/3289#issuecomment-1158648333
thanks
checkstyles are fixed locally. only two are real checkstyles, the other is a
link length in the javadocs.
Issue Time Tracking
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Worklog Id: (was: 782313)
Time Spent: 12h 40m (was: 12.5h)
> Improve Magic Committer Performance
> -----------------------------------
>
> Key: HADOOP-17833
> URL: https://issues.apache.org/jira/browse/HADOOP-17833
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs/s3
> Affects Versions: 3.3.1
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 12h 40m
> Remaining Estimate: 0h
>
> Magic committer tasks can be slow because every file created with
> overwrite=false triggers a HEAD (verify there's no file) and a LIST (that
> there's no dir). And because of delayed manifestations, it may not behave as
> expected.
> ParquetOutputFormat is one example of a library which does this.
> we could fix parquet to use overwrite=true, but (a) there may be surprises in
> other uses (b) it'd still leave the list and (c) do nothing for other formats
> call
> Proposed: createFile() under a magic path to skip all probes for file/dir at
> end of path
> Only a single task attempt Will be writing to that directory and it should
> know what it is doing. If there is conflicting file names and parts across
> tasks that won't even get picked up at this point. Oh and none of the
> committers ever check for this: you'll get the last file manifested (s3a) or
> renamed (file)
> If we skip the checks we will save 2 HTTP requests/file.
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