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https://issues.apache.org/jira/browse/HDFS-6803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14082886#comment-14082886
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stack commented on HDFS-6803:
-----------------------------

[~cmccabe] Colin Patrick, you ok w/ the our converting our assertions to HDFS 
'optimizations' (that may or may not hold in future versions)?  Any others 
you'd suggest?  Thanks sir.

> Documenting DFSClient#DFSInputStream expectations reading and preading in 
> concurrent context
> --------------------------------------------------------------------------------------------
>
>                 Key: HDFS-6803
>                 URL: https://issues.apache.org/jira/browse/HDFS-6803
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>    Affects Versions: 2.4.1
>            Reporter: stack
>         Attachments: DocumentingDFSClientDFSInputStream (1).pdf
>
>
> Reviews of the patch posted the parent task suggest that we be more explicit 
> about how DFSIS is expected to behave when being read by contending threads. 
> It is also suggested that presumptions made internally be made explicit 
> documenting expectations.
> Before we put up a patch we've made a document of assertions we'd like to 
> make into tenets of DFSInputSteam.  If agreement, we'll attach to this issue 
> a patch that weaves the assumptions into DFSIS as javadoc and class comments. 



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