Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/2844#discussion_r19063363
--- Diff:
core/src/main/scala/org/apache/spark/broadcast/TorrentBroadcast.scala ---
@@ -62,6 +59,20 @@ private[spark] class TorrentBroadcast[T: ClassTag](
* blocks from the driver and/or other executors.
*/
@transient private var _value: T = obj
+ /** The compression codec to use, or None if compression is disabled */
+ @transient private var compressionCodec: Option[CompressionCodec] = _
+ /** Size of each block. Default value is 4MB. This value is only read
by the broadcaster. */
+ @transient private var blockSize: Int = _
--- End diff --
I thought about this and agree that it might be cleaner, but this will
require more refactoring of other code. One design goal here was to minimize
the serialized size of TorrentBroadcast objects, so we can't serialize the
SparkConf or CompressionCodec instances (which contain SparkConfs).
SparkEnv.conf determines these values anyways.
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