Steve Loughran updated HADOOP-14747:
    Parent: HADOOP-15220  (was: HADOOP-14831)

> S3AInputStream to implement CanUnbuffer
> ---------------------------------------
>                 Key: HADOOP-14747
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14747
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 2.8.1
>            Reporter: Steve Loughran
>            Priority: Major
> 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.
> Needs
> * 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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