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From "Dave Beech (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CRUNCH-218) Add new Target.WriteMode to skip the write and continue pipeline if an output target exists
Date Wed, 12 Jun 2013 15:58:20 GMT
Dave Beech created CRUNCH-218:
---------------------------------

             Summary: 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


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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