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https://issues.apache.org/jira/browse/MAPREDUCE-6760?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran updated MAPREDUCE-6760:
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Description:
{{LocatedFileStatusFetcher}} does parallelized path listing, but it does make
recursive calls on every subdir.
If we could switch it to use {{FileSystem.listFiles(recursive)}}, object stores
that have high-performance implementations of that operation would see
significant speedup.
HADOOP-13208 implements that for S3A; Azure, swift &c can do the same.
was:
{{LocatedFileStatusFetcher }} does parallelized path listing, but it does make
recursive calls on every subdir.
If we could switch it to use {{FileSystem.listFiles(recursive)}}, object stores
that have high-performance implementations of that operation would see
significant speedup.
HADOOP-13208 implements that for S3A; Azure, swift &c can do the same.
> LocatedFileStatusFetcher to use listFiles(recursive)
> ----------------------------------------------------
>
> Key: MAPREDUCE-6760
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6760
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: mrv2
> Affects Versions: 2.8.0
> Reporter: Steve Loughran
>
> {{LocatedFileStatusFetcher}} does parallelized path listing, but it does make
> recursive calls on every subdir.
> If we could switch it to use {{FileSystem.listFiles(recursive)}}, object
> stores that have high-performance implementations of that operation would see
> significant speedup.
> HADOOP-13208 implements that for S3A; Azure, swift &c can do the same.
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