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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2014/08/17 04:13:18 UTC

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

    [ https://issues.apache.org/jira/browse/SPARK-3084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14099853#comment-14099853 ] 

Apache Spark commented on SPARK-3084:
-------------------------------------

User 'mateiz' has created a pull request for this issue:
https://github.com/apache/spark/pull/1990

> 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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