Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/5277#issuecomment-87897974
From the comments, only `activeContext`, `contextBeingConstructed` are
protected by `SPARK_CONTEXT_CONSTRUCTOR_LOCK`. So we can move most of codes out
of the lock. E.g.,
```Scala
def stop() {
SparkContext.SPARK_CONTEXT_CONSTRUCTOR_LOCK.synchronized {
if (!stopped) {
stopped = true
} else {
logInfo("SparkContext already stopped")
return
}
}
postApplicationEnd()
ui.foreach(_.stop())
env.metricsSystem.report()
metadataCleaner.cancel()
cleaner.foreach(_.stop())
dagScheduler.stop()
dagScheduler = null
listenerBus.stop()
eventLogger.foreach(_.stop())
env.rpcEnv.stop(heartbeatReceiver)
progressBar.foreach(_.stop())
taskScheduler = null
// TODO: Cache.stop()?
env.stop()
SparkEnv.set(null)
logInfo("Successfully stopped SparkContext")
SparkContext.clearActiveContext()
}
```
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