apache/spark — pull request #1437 by mengxr (2014-07-16 08:19:38+00:00)
Title: [SPARK-2522] set default broadcast factory to torrent

HttpBroadcastFactory is the current default broadcast factory. It sends the broadcast data to each worker one by one, which is slow when the cluster is big. TorrentBroadcastFactory scales much better than http. Maybe we should make torrent the default broadcast method.