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https://issues.apache.org/jira/browse/HADOOP-14747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16153495#comment-16153495
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Steve Loughran commented on HADOOP-14747:
-----------------------------------------
Should we stub this out in Hadoop 3.1 for s3a, wasb & ADL just to keep hbase
happy?
> 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
>
> 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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