[jira] [Assigned] (SPARK-17559) PeriodicGraphCheckpointer didnot persist edges as expected in some cases

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-17559?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-17559:
------------------------------------

    Assignee:     (was: Apache Spark)

> PeriodicGraphCheckpointer didnot persist edges as expected in some cases
> ------------------------------------------------------------------------
>
>                 Key: SPARK-17559
>                 URL: https://issues.apache.org/jira/browse/SPARK-17559
>             Project: Spark
>          Issue Type: Bug
>          Components: MLlib
>            Reporter: ding
>            Priority: Minor
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> When use PeriodicGraphCheckpointer to persist graph, sometimes the edge isn't persisted. As currently only when vertices's storage level is none, graph is persisted. However there is a chance vertices's storage level is not none while edges's is none. Eg. graph created by a outerJoinVertices operation, vertices is automatically cached while edges is not. In this way, edges will not be persisted if we use PeriodicGraphCheckpointer do persist.
> See below minimum example:
>    val graphCheckpointer = new PeriodicGraphCheckpointer[Array[String], Int](2, sc)
>     val users = sc.textFile("data/graphx/users.txt")
>       .map(line => line.split(",")).map(parts => (parts.head.toLong, parts.tail))
>     val followerGraph = GraphLoader.edgeListFile(sc, "data/graphx/followers.txt")
>     val graph = followerGraph.outerJoinVertices(users) {
>       case (uid, deg, Some(attrList)) => attrList
>       case (uid, deg, None) => Array.empty[String]
>     }
>     graphCheckpointer.update(graph)    



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