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https://issues.apache.org/jira/browse/CRUNCH-218?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Josh Wills resolved CRUNCH-218.
-------------------------------
Resolution: Fixed
Fix Version/s: 0.7.0
Pushed to master.
> Add new Target.WriteMode to skip the write and continue pipeline if an output
> target exists
> -------------------------------------------------------------------------------------------
>
> Key: CRUNCH-218
> URL: https://issues.apache.org/jira/browse/CRUNCH-218
> Project: Crunch
> Issue Type: Improvement
> Components: Core
> Affects Versions: 0.6.0
> Reporter: Dave Beech
> Assignee: Josh Wills
> Priority: Minor
> Fix For: 0.7.0
>
> Attachments: CRUNCH-218b.patch, CRUNCH-218c.patch, CRUNCH-218d.patch,
> CRUNCH-218.patch
>
>
> Quite often I write pipelines which persist data to the filesystem midway
> through the process, and then carry on doing further work.
> If this intermediate data is already present, I think it would be good if I
> could set a write mode which skips over this first half of processing. This
> way I'd avoid running jobs unnecessarily and wasting cluster resources
> regenerating data I already have.
> Example:
> PCollection<B> inter =
> pipeline.read(source).parallelDo(something).parallelDo(somethingElse);
> inter.write(At.sequenceFile('output'), WriteMode.SKIP_IF_EXISTS);
> PCollection<C> final = inter.parallelDo(moreWork);
>
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