Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/3710#discussion_r22263766
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/scheduler/StreamingListenerBus.scala
---
@@ -64,36 +71,40 @@ private[spark] class StreamingListenerBus() extends
Logging {
}
def addListener(listener: StreamingListener) {
- listeners += listener
+ listeners.add(listener)
}
def post(event: StreamingListenerEvent) {
+ if (stopped) {
+ // Drop further events to make `StreamingListenerShutdown` be
delivered ASAP
+ logError("StreamingListenerBus has been stopped! Drop " + event)
+ return
+ }
val eventAdded = eventQueue.offer(event)
- if (!eventAdded && !queueFullErrorMessageLogged) {
+ if (!eventAdded && queueFullErrorMessageLogged.compareAndSet(false,
true)) {
logError("Dropping StreamingListenerEvent because no remaining room
in event queue. " +
"This likely means one of the StreamingListeners is too slow and
cannot keep up with the " +
"rate at which events are being started by the scheduler.")
- queueFullErrorMessageLogged = true
}
}
- /**
- * Waits until there are no more events in the queue, or until the
specified time has elapsed.
- * Used for testing only. Returns true if the queue has emptied and
false is the specified time
- * elapsed before the queue emptied.
- */
- def waitUntilEmpty(timeoutMillis: Int): Boolean = {
- val finishTime = System.currentTimeMillis + timeoutMillis
- while (!eventQueue.isEmpty) {
- if (System.currentTimeMillis > finishTime) {
- return false
+ def stop(): Unit = {
+ stopped = true
+ // Should not call `post`, or `StreamingListenerShutdown` may be
dropped.
+ eventQueue.put(StreamingListenerShutdown)
+ listenerThread.join()
+ }
+
+ private def foreachListener(f: StreamingListener => Unit): Unit = {
+ val iter = listeners.iterator
--- End diff --
If this change is to avoid an implicit Java -> Scala collections
conversion, why not replace the `JavaConversions` implicits with the more
explicit `JavaConverters` instead, so that you have to manually write `.asJava`
or `.asScala`? That, in addition to a comment, would make it more obvious if
we're re-introducing those conversions.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
