[jira] [Created] (SPARK-2025) EdgeRDD persists after pregel iteration

["Tim Weninger (JIRA)" <ji...@apache.org>]

Tim Weninger created SPARK-2025:
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             Summary: EdgeRDD persists after pregel iteration
                 Key: SPARK-2025
                 URL: https://issues.apache.org/jira/browse/SPARK-2025
             Project: Spark
          Issue Type: Bug
          Components: GraphX
    Affects Versions: 1.0.0, 1.0.1
         Environment: RHEL6 on local and on spark cluster
            Reporter: Tim Weninger


Symptoms: During execution of a pregel script/function a copy of an intermediate EdgeRDD object persists after each iteration as shown by the Spark WebUI - storage.

This is like a memory leak that affects in the Pregel function.

For example, after the first iteration I will have an EdgeRDD in addition to the EdgeRDD and VertexRDD that are kept for the next iteration. After 15 iterations I will have 15 EdgeRDDs in addition to the current/correct state represented by a single set of 1 EdgeRDD and 1 VertexRDD.

At the end of a Pregel loop the old EdgeRDD and VertexRDD are unpersisted, but there seems to be another EdgeRDD that is created somewhere that does not get unpersisted.

i _think_ this is from the replicateVertex function, but I cannot be sure.



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