Steve Loughran created HADOOP-14747:

             Summary: S3AInputStream to implement CanUnbuffer
                 Key: HADOOP-14747
             Project: Hadoop Common
          Issue Type: Sub-task
          Components: fs/s3
    Affects Versions: 2.8.1
            Reporter: Steve Loughran

HBase relies on FileSystems implementing {{CanUnbuffer.unbuffer()}} to force 
input streams to free up remote connections (HBASE-9393). This works for HDFS, 
but not elsewhere.

S3A input stream can implement {{CanUnbuffer.unbuffer()}} by closing the input 
stream and relying on lazy seek to reopen it on demand.

* Contract specification of unbuffer. As in "who added a new feature to 
filesystems but forgot to mention what it should do?"
* Contract test for filesystems which declare their support. 
* S3AInputStream to call {{closeStream()}} on a call to {{unbuffer()}}.
* Test case

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