[jira] [Created] (SPARK-18742) readd spark.broadcast.factory for user-defined BroadcastFactory

["Song Jun (JIRA)" <ji...@apache.org>]

Song Jun created SPARK-18742:
--------------------------------

             Summary: readd spark.broadcast.factory for user-defined BroadcastFactory
                 Key: SPARK-18742
                 URL: https://issues.apache.org/jira/browse/SPARK-18742
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
            Reporter: Song Jun
            Priority: Minor


After SPARK-12588 Remove HTTPBroadcast [1], the one and only
implementation of BroadcastFactory is TorrentBroadcastFactory. No code
in Spark 2 uses BroadcastFactory (but TorrentBroadcastFactory) however
the scaladoc says [2]:

/**
 * An interface for all the broadcast implementations in Spark (to allow
 * multiple broadcast implementations). SparkContext uses a user-specified
 * BroadcastFactory implementation to instantiate a particular broadcast for the
 * entire Spark job.
 */

which is not correct since there is no way to plug in a custom
user-specified BroadcastFactory.

It is better to readd spark.broadcast.factory for user-defined BroadcastFactory
 
[1] https://issues.apache.org/jira/browse/SPARK-12588
[2] https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/broadcast/BroadcastFactory.scala#L25-L30



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