Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/1165#discussion_r14808344
--- Diff: core/src/main/scala/org/apache/spark/SparkEnv.scala ---
@@ -67,10 +67,14 @@ class SparkEnv (
val metricsSystem: MetricsSystem,
val conf: SparkConf) extends Logging {
- // A mapping of thread ID to amount of memory used for shuffle in bytes
+ // A mapping of thread ID to amount of memory, in bytes, used for shuffle
// All accesses should be manually synchronized
val shuffleMemoryMap = mutable.HashMap[Long, Long]()
+ // A mapping of thread ID to amount of memory, in bytes, used for
unrolling an RDD partition
+ // All accesses should be manually synchronized
+ val cacheMemoryMap = mutable.HashMap[Long, Long]()
--- End diff --
Could we call this `partitionMemoryMap`? Otherwise it could seem like this
actually represents home of the cached data.
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