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https://issues.apache.org/jira/browse/HADOOP-19158?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran updated HADOOP-19158:
------------------------------------
    Description: 
Make it easy for any stream with vector io to support 
{{ByteBufferPositionedReadable}}

Specifically, {{ByteBufferPositionedReadable.readFully()}}

is exactly a single range read so is easy to read.

the simpler read() call which can return less isn't part of the vector API.
Proposed: invoke the readFully() but convert an EOFException to -1 

  was:
Make it easy for any stream with vector io to suppor

Specifically, 

ByteBufferPositionedReadable.readFully()

is exactly a single range read so is easy to read.

the simpler read() call which can return less isn't part of the vector API.
Proposed: invoke the readFully() but convert an EOFException to -1 


> S3A: Support delegating ByteBufferPositionedReadable through vector IO
> ----------------------------------------------------------------------
>
>                 Key: HADOOP-19158
>                 URL: https://issues.apache.org/jira/browse/HADOOP-19158
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs, fs/s3
>    Affects Versions: 3.4.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>
> Make it easy for any stream with vector io to support 
> {{ByteBufferPositionedReadable}}
> Specifically, {{ByteBufferPositionedReadable.readFully()}}
> is exactly a single range read so is easy to read.
> the simpler read() call which can return less isn't part of the vector API.
> Proposed: invoke the readFully() but convert an EOFException to -1 



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