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https://issues.apache.org/jira/browse/HADOOP-9495?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran updated HADOOP-9495:
-----------------------------------

    Attachment: HADOOP-9495.patch

Patch defines Seek and PositionedRead all together, along with a summary of key 
requirements of InputStream. It adds definitions and invariants for use across 
other specifications. It doesn't include {{readFully()}} yet.

This is a fairly formal specification, despite its uses of MUST and MAY, you 
could rewrite it any modern formal specification language with relative ease. I 
don't plan to do the rest of the FS specification quite as rigorously. 
                
> Define behaviour of Seekable.seek(), write tests, fix all hadoop 
> implementations for compliance
> -----------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-9495
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9495
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs
>    Affects Versions: 1.2.0, 3.0.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>         Attachments: HADOOP-9495.patch
>
>
> {{Seekable.seek()}} seems a good starting point for specifying, testing and 
> implementing FS API compliance: one method, relatively non-ambiguous 
> semantics, easily assessed used in the Hadoop codebase. Specify and test it 
> first

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