Steve Loughran created HADOOP-18189:
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             Summary: S3PrefetchingInputStream to support status probes when 
closed
                 Key: HADOOP-18189
                 URL: https://issues.apache.org/jira/browse/HADOOP-18189
             Project: Hadoop Common
          Issue Type: Sub-task
          Components: fs/s3
    Affects Versions: 3.4.0
            Reporter: Steve Loughran


S3PrefetchingInputStream is a bit over aggressive on raising 
exceptions/downgrading responses after a stream is closed

* MUST: getPos() to return last read location, or a least 0 (maybe we should 
add this to filesystem spec)
* MUST: getIOStatistics(). critical for collecting stats in processes
* MUST: seekToNewSource() (it's a no op anyway)
* MAY S3AInputStreamStatistics and getStreamStatistics() though that is only in 
used in testing...ioStatistics have given us a stable stats api. we may want to 
tag the method @VisibleForTesting to discourage use.



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