[jira] [Created] (TINKERPOP3-631) If there is a reducing barrier in OLAP, let the next stages

["Marko A. Rodriguez (JIRA)" <ji...@apache.org>]

Marko A. Rodriguez created TINKERPOP3-631:
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             Summary: If there is a reducing barrier in OLAP, let the next stages 
                 Key: TINKERPOP3-631
                 URL: https://issues.apache.org/jira/browse/TINKERPOP3-631
             Project: TinkerPop 3
          Issue Type: Improvement
          Components: process
            Reporter: Marko A. Rodriguez
            Assignee: Marko A. Rodriguez


Right now, mid-traversal barriers are not allowed. 

{code}
gremlin> g.E().has(label,'rated').groupCount().by('stars').order(local).by(valueDecr)
Global traversals on GraphComputer may not contain mid-traversal barriers: GroupCountStep(value(stars))
Display stack trace? [yN]
{code}

This is because the barrier will aggregate to a single value and what machine is that value suppose to then be on? How about the driver machine? Thus, perhaps once a barrier is hit, the remaining steps are executed OLTP? .... its easy to do, but the problem is that it may confuse people as to the level of parallelism.



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