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From "Greg Hogan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (FLINK-3806) Revert use of DataSet.count() in Gelly
Date Wed, 25 May 2016 15:11:12 GMT

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

Greg Hogan updated FLINK-3806:
------------------------------
    Fix Version/s: 1.1.0

> 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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