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https://issues.apache.org/jira/browse/TINKERPOP3-631?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marko A. Rodriguez closed TINKERPOP3-631.
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Resolution: Duplicate
This work is described in TINKERPOP3-570.
> If there is a reducing barrier in OLAP, let the next stages by OLTP
> -------------------------------------------------------------------
>
> Key: TINKERPOP3-631
> URL: https://issues.apache.org/jira/browse/TINKERPOP3-631
> Project: TinkerPop 3
> Issue Type: Improvement
> Components: process
> Affects Versions: 3.0.2-incubating
> 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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