[jira] [Assigned] (TINKERPOP-1529) LazyBarrierStrategy is too agressive

["Daniel Kuppitz (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TINKERPOP-1529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Kuppitz reassigned TINKERPOP-1529:
-----------------------------------------

    Assignee: Daniel Kuppitz

> LazyBarrierStrategy is too agressive
> ------------------------------------
>
>                 Key: TINKERPOP-1529
>                 URL: https://issues.apache.org/jira/browse/TINKERPOP-1529
>             Project: TinkerPop
>          Issue Type: Bug
>          Components: process
>    Affects Versions: 3.2.3
>            Reporter: Daniel Kuppitz
>            Assignee: Daniel Kuppitz
>
> There are scenarios where {{LazyBarrierStrategy}} changes the semantics of a traversal:
> {noformat}
> gremlin> g = TinkerFactory.createModern().traversal()
> ==>graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
> gremlin> g.V().store("a").out().select("a")
> ==>[v[1],v[2],v[3],v[4],v[5],v[6]]
> ==>[v[1],v[2],v[3],v[4],v[5],v[6]]
> ==>[v[1],v[2],v[3],v[4],v[5],v[6]]
> ==>[v[1],v[2],v[3],v[4],v[5],v[6]]
> ==>[v[1],v[2],v[3],v[4],v[5],v[6]]
> ==>[v[1],v[2],v[3],v[4],v[5],v[6]]
> {noformat}
> This is actually not the result of {{store()}}, this is {{aggregate()}}. The expected result for {{store()}} would be:
> {noformat}
> ==>[v[1]]
> ==>[v[1]]
> ==>[v[1]]
> ==>[v[1],v[2],v[3],v[4]]
> ==>[v[1],v[2],v[3],v[4]]
> ==>[v[1],v[2],v[3],v[4],v[5],v[6]]
> {noformat}
> Another issue, which should probably go into another ticket, is this:
> {noformat}
> gremlin> g.withoutStrategies(LazyBarrierStrategy).V().store("a").out().select("a")
> ==>[v[1],v[2],v[3],v[4],v[5],v[6]]
> ==>[v[1],v[2],v[3],v[4],v[5],v[6]]
> ==>[v[1],v[2],v[3],v[4],v[5],v[6]]
> {noformat}
> That's it, the console is hanging at this point. Looks like {{PathRetractionStrategy}} is the remaining troublemaker. With both strategies excluded, we get the expected result:
> {noformat}
> gremlin> g.withoutStrategies(LazyBarrierStrategy, PathRetractionStrategy).V().store("a").out().select("a")
> ==>[v[1]]
> ==>[v[1]]
> ==>[v[1]]
> ==>[v[1],v[2],v[3],v[4]]
> ==>[v[1],v[2],v[3],v[4]]
> ==>[v[1],v[2],v[3],v[4],v[5],v[6]]
> {noformat}



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