[jira] [Closed] (FLINK-3806) Revert use of DataSet.count() in Gelly

["Greg Hogan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-3806?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Greg Hogan closed FLINK-3806.
-----------------------------
    Resolution: Fixed

Fixed in 36ad78c0821fdae0a69371c67602dd2a7955e4a8

> Revert use of DataSet.count() in Gelly
> --------------------------------------
>
>                 Key: FLINK-3806
>                 URL: https://issues.apache.org/jira/browse/FLINK-3806
>             Project: Flink
>          Issue Type: Improvement
>          Components: Gelly
>    Affects Versions: 1.1.0
>            Reporter: Greg Hogan
>            Assignee: Greg Hogan
>            Priority: Critical
>             Fix For: 1.1.0
>
>
> FLINK-1632 replaced {{GraphUtils.count}} with {{DataSetUtils.count}}. The former returns a {{DataSet}} while the latter executes a job to return a Java value.
> {{DataSetUtils.count}} is called from {{Graph.numberOfVertices}} and {{Graph.numberOfEdges}} which are called from {{GatherSumApplyIteration}} and {{ScatterGatherIteration}} as well as the {{PageRank}} algorithms when the user does not pass the number of vertices as a parameter.
> As noted in FLINK-1632, this does make the code simpler but if my understanding is correct will materialize the Graph twice. The Graph will need to be reread from input, regenerated, or recomputed by preceding algorithms.



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