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https://issues.apache.org/jira/browse/HADOOP-13371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15933107#comment-15933107
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ASF GitHub Bot commented on HADOOP-13371:
-----------------------------------------
Github user kazuyukitanimura commented on the issue:
https://github.com/apache/hadoop/pull/203
Thanks @steveloughran
I understand your point that getting the sign off for the core class
changes is not easy. At the same time, #204 seems to be a big change. I was
wondering if there is a way to meet at somewhere in the middle. It is important
to provide the end users a way to glob things on S3. It easily hits OOM with
the current code.
Meanwhile, I will keep trying to contribute to #204, which seems to be a
right long term solution.
Also, I made a few other fixes related to S3A. My current employer just
allowed me to spend 20% of my time to contribute back to the community. I hope
you don't mind that I mention your name in the pull requests that I am going to
file.
> S3A globber to use bulk listObject call over recursive directory scan
> ---------------------------------------------------------------------
>
> Key: HADOOP-13371
> URL: https://issues.apache.org/jira/browse/HADOOP-13371
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs, fs/s3
> Affects Versions: 2.8.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
>
> HADOOP-13208 produces O(1) listing of directory trees in
> {{FileSystem.listStatus}} calls, but doesn't do anything for
> {{FileSystem.globStatus()}}, which uses a completely different codepath, one
> which does a selective recursive scan by pattern matching as it goes down,
> filtering out those patterns which don't match. Cost is
> O(matching-directories) + cost of examining the files.
> It should be possible to do the glob status listing in S3A not through the
> filtered treewalk, but through a list + filter operation. This would be an
> O(files) lookup *before any filtering took place*.
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