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From "Micah Whitacre (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CRUNCH-405) Explore adding support for idempotent MRPipeline.plan()
Date Wed, 20 Aug 2014 02:26:18 GMT

     [ https://issues.apache.org/jira/browse/CRUNCH-405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Micah Whitacre updated CRUNCH-405:
----------------------------------

    Attachment: CRUNCH-405d.patch

Here is a patch that adds javadoc to the two methods.

Allan, the "hand waving" you mention was something similar to what I was envisioning but it
is definitely a more sweeping change to how Crunch build graphs and tracks states.  Specifically
right now Crunch tracks a lot of information on individual PCollections vs just in the generated
plan.  So it'd be nice to separate those concerns but would delay the idempotent functionality
significantly.

> 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.patch, CRUNCH-405_v1.patch, CRUNCH-405b.patch, CRUNCH-405c.patch,
CRUNCH-405d.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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