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From "Josh Wills (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CRUNCH-405) Explore adding support for idempotent MRPipeline.plan()
Date Thu, 17 Jul 2014 19:17:06 GMT

    [ https://issues.apache.org/jira/browse/CRUNCH-405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14065395#comment-14065395
] 

Josh Wills commented on CRUNCH-405:
-----------------------------------

Yes, essentially a more sophisticated version of someone trying to do that. Do you think that's
worth worrying about?

> Explore adding support for idempotent MRPipeline.plan()
> -------------------------------------------------------
>
>                 Key: CRUNCH-405
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-405
>             Project: Crunch
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Micah Whitacre
>            Assignee: Micah Whitacre
>         Attachments: CRUNCH-405_v1.patch
>
>
> Talking through a use case with a consumer, they were interested in having the ability
to run the MRPipeline.plan() method one to many times prior to ever calling the Pipeline.run/done
methods.  The reason for this was they were looking at pulling information off the MRExecutor
to tweak settings inside of their DoFns.
> Currently the MRPipeline implementation however does not have an idempotent plan() method
as it alters the state of internal values therefore affecting the full run once done() is
called.  
> It would be nice if we added an idempotent plan() method that could be gather this information
or perhaps a reset option.  



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