ASF GitHub Bot commented on HADOOP-13371:

Github user steveloughran commented on the issue:

    wontfix. S3guard is needed for consistency, and as it delivers the speedup 
we need at the same time, making traumatic changes to the core code is hard to 
justify right now

> 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
>            Priority: Major
> 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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