[jira] [Assigned] (TINKERPOP-2187) Two issues with the ShortestPathVertexProgram

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

     [ https://issues.apache.org/jira/browse/TINKERPOP-2187?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Kuppitz reassigned TINKERPOP-2187:
-----------------------------------------

    Assignee: Daniel Kuppitz

> Two issues with the ShortestPathVertexProgram
> ---------------------------------------------
>
>                 Key: TINKERPOP-2187
>                 URL: https://issues.apache.org/jira/browse/TINKERPOP-2187
>             Project: TinkerPop
>          Issue Type: Bug
>          Components: process
>    Affects Versions: 3.4.1
>            Reporter: Florian Hockmann
>            Assignee: Daniel Kuppitz
>            Priority: Minor
>
> While trying to update JanusGraph to TinkerPop 3.4.0, I encountered two issues with the {{ShortestPathVertexProgramm}}:
>  # {{ShortestPathVertexProgram.getMessageScopes()}} returns an empty collection which doesn't work for a graph computer that uses these scopes to execute the edge traversal. I think the scopes should be {{Global}} and {{Local}} with the edge traversal.
>  # The {{ShortestPathVertexProgram}} defines no message combiner, but {{sendMessages()}} can apparently still send multiple messages for the same vertex.
>  For some reason, this doesn't lead to any problems for the {{TinkerGraphComputer}}. (Maybe it receives each message before another one can be sent for the same vertex?)
>  For {{FulgoraGraphComputer}} however some tests result in a situation where multiple messages are sent to the same vertex which fails because no combiner is defined.
>  So, I'd say that the {{ShortestPathVertexProgram}} should have a message combiner.



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