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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6803) Documenting DFSClient#DFSInputStream expectations reading and preading in concurrent context
Date Fri, 01 Aug 2014 20:23:40 GMT

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

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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