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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