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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8319) FileContext does not support setWriteChecksum
Date Fri, 04 May 2012 20:04:48 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8319?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13268667#comment-13268667
] 

Daryn Sharp commented on HADOOP-8319:
-------------------------------------

bq. The reason setWriteChecksum requires a patch argument is because FileContext, just like
ViewFS, works on paths and resolves the path to an FS. If we remove the path, setWriteChecksum
will have the side effect that it apply to all the FS that the filecontext resolves in a path.

The side-effect is the very solution to the bug.  If I tell my context: "disable writing checksums
because I really don't care about integrity", then I implicitly don't care where the data
is being written by the context.  With the patch as-is, the user can't reliably control the
writing or verification of checksums w/o explicitly resolving paths and creating a new context
for the resolved path -- which kind of defeats the purpose of the context.

Do you have another solution in mind to control the flags?
                
> FileContext does not support setWriteChecksum
> ---------------------------------------------
>
>                 Key: HADOOP-8319
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8319
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.0.0, 3.0.0
>            Reporter: John George
>            Assignee: John George
>         Attachments: HADOOP-8319.patch, HADOOP-8319.patch, HADOOP-8319.patch, HADOOP-8319.patch,
HADOOP-8319.patch
>
>
> File Context does not support setWriteChecksum and hence users trying
> to use this functionality fails.

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