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From "John George (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8319) FileContext does not support setWriteChecksum
Date Wed, 09 May 2012 13:33:48 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8319?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13271405#comment-13271405
] 

John George commented on HADOOP-8319:
-------------------------------------

Sorry  I missed this comment.
{quote}
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.
{quote}
The user can set/reset the values specific to the path. But like you said, the other option
is to allow user to only set/reset per file context (as opposed to per AFS that each path
belongs to). That might simplify the implementation and make it less complex for the user
as well. 

{quote}
Do you have another solution in mind to control the flags?
{quote}
The other solution is to cache the state per AFS which is the latest patch I have uploaded.
But, I am leaning towards your proposal of per FC, especially since the setWD and getWD are
implemented per FC.

Let me know your thoughts either way. Thanks for all your inputs Daryn.
                
> 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, HADOOP-8319.patch
>
>
> File Context does not support setWriteChecksum and hence users trying
> to use this functionality fails.

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