Steve Loughran commented on HADOOP-14748:

Note that HBase running on WASB complains a lot about streams not having this 
feature...it now expects them to

> Wasb input streams to implement CanUnbuffer
> -------------------------------------------
>                 Key: HADOOP-14748
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14748
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/azure
>    Affects Versions: 2.9.0
>            Reporter: Steve Loughran
>            Priority: Minor
> HBase relies on FileSystems implementing CanUnbuffer.unbuffer() to force 
> input streams to free up remote connections (HBASE-9393Link). This works for 
> HDFS, but not elsewhere.
> WASB {{BlockBlobInputStream}} can implement this by closing the stream 
>  in ({{closeBlobInputStream}}, so it will be re-opened elsewhere.

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