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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-14645) add a predicate/option to probe an S3A FS for being consistent
Date Wed, 12 Jul 2017 15:57:00 GMT
Steve Loughran created HADOOP-14645:
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             Summary: add a predicate/option to probe an S3A FS for being consistent
                 Key: HADOOP-14645
                 URL: https://issues.apache.org/jira/browse/HADOOP-14645
             Project: Hadoop Common
          Issue Type: Sub-task
          Components: fs/s3
    Affects Versions: HADOOP-13345
            Reporter: Steve Loughran


The committer work shows It's useful for s3a-aware code to be able to ask if the FS is consistent
fir listings. AWS S3 is when s3guard is turned on, but third-party S3 implementations may
also be consistent.

The committer should be able to ask an FS if it is consistent, something which can be
* off by default against AWS
* configured to be one for all buckets (external s3 server)
* dynamically set when s3guard is enabled.

This could be done with some predicate isListingConsistent(), or just probed as an FS option
(fs.s3a.consistent.listing) which could be set explicitly in configs, and set dynamically
when s3guard is on. That's actually the simpleset route all round



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