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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-14402) roll out StreamCapabilities across output streams of all filesystems
Date Tue, 09 May 2017 15:44:04 GMT
Steve Loughran created HADOOP-14402:
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             Summary: roll out StreamCapabilities across output streams of all filesystems
                 Key: HADOOP-14402
                 URL: https://issues.apache.org/jira/browse/HADOOP-14402
             Project: Hadoop Common
          Issue Type: Improvement
          Components: fs, fs/adl, fs/azure, fs/oss, fs/s3, fs/swift
    Affects Versions: 3.0.0-alpha3
            Reporter: Steve Loughran


HDFS-11644 added a way to probe streams for capabilities, with dfsoutput stream implementing
some. 

We should roll this out to all our output streams, with capabilities to define

* is metadata in sync with flushed data (HDFS: no)
* does LocalFileSystem really do a sync/flush (as I don't think any subclass of ChecksumFS
does, so {{FSOutputSummer}} should declare this in its capabilities
* are intermediate writes visible *at all*? 
* Is close() potentially a long operation (for object stores, yes, on a case-by-case basis)

We'll need useful names for these options, obviously, tests, etc etc




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