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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2015/06/04 08:34:38 UTC
[jira] [Assigned] (SPARK-3650) Triangle Count handles reverse edges
incorrectly
[ https://issues.apache.org/jira/browse/SPARK-3650?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-3650:
-----------------------------------
Assignee: Apache Spark
> Triangle Count handles reverse edges incorrectly
> ------------------------------------------------
>
> Key: SPARK-3650
> URL: https://issues.apache.org/jira/browse/SPARK-3650
> Project: Spark
> Issue Type: Bug
> Components: GraphX
> Affects Versions: 1.1.0, 1.2.0
> Reporter: Joseph E. Gonzalez
> Assignee: Apache Spark
> Priority: Critical
>
> The triangle count implementation assumes that edges are aligned in a canonical direction. As stated in the documentation:
> bq. Note that the input graph should have its edges in canonical direction (i.e. the `sourceId` less than `destId`)
> However the TriangleCount algorithm does not verify that this condition holds and indeed even the unit tests exploits this functionality:
> {code:scala}
> val triangles = Array(0L -> 1L, 1L -> 2L, 2L -> 0L) ++
> Array(0L -> -1L, -1L -> -2L, -2L -> 0L)
> val rawEdges = sc.parallelize(triangles, 2)
> val graph = Graph.fromEdgeTuples(rawEdges, true).cache()
> val triangleCount = graph.triangleCount()
> val verts = triangleCount.vertices
> verts.collect().foreach { case (vid, count) =>
> if (vid == 0) {
> assert(count === 4) // <-- Should be 2
> } else {
> assert(count === 2) // <-- Should be 1
> }
> }
> {code}
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