Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/2138#discussion_r16727497
--- Diff: core/src/main/scala/org/apache/spark/SparkEnv.scala ---
@@ -81,7 +82,9 @@ class SparkEnv (
shuffleManager.stop()
broadcastManager.stop()
blockManager.stop()
- blockManager.master.stop()
+ if (isDriver) {
+ blockManager.master.stop()
--- End diff --
The `BlockManagerMaster` actually exists on executors too. This is the
consequence of bad naming, but this class is really the "agent with which the
`BlockManager` (on both executors and the driver) communicates with the driver"
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