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Posted to issues@spark.apache.org by "Matei Zaharia (JIRA)" <ji...@apache.org> on 2014/08/17 03:54:18 UTC

[jira] [Created] (SPARK-3084) Collect broadcasted tables in parallel in joins

Matei Zaharia created SPARK-3084:
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             Summary: Collect broadcasted tables in parallel in joins
                 Key: SPARK-3084
                 URL: https://issues.apache.org/jira/browse/SPARK-3084
             Project: Spark
          Issue Type: Bug
          Components: SQL
            Reporter: Matei Zaharia
            Assignee: Matei Zaharia


BroadcastHashJoin has a broadcastFuture variable that tries to collect the broadcasted table in a separate thread, but this doesn't help because it's a lazy val that only gets initialized when you attempt to build the RDD. Thus queries that broadcast multiple tables would collect and broadcast them sequentially.



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