Github user mridulm commented on a diff in the pull request:
https://github.com/apache/spark/pull/2030#discussion_r16434246
--- Diff:
core/src/main/scala/org/apache/spark/broadcast/TorrentBroadcast.scala ---
@@ -109,99 +155,30 @@ private[spark] class TorrentBroadcast[T: ClassTag](
private def readObject(in: ObjectInputStream) {
in.defaultReadObject()
TorrentBroadcast.synchronized {
--- End diff --
The lock is not on a specific instance - but on global class if I am not
wrong.
A single slow readObject will block all other cores waiting for the lock to
be released.
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