Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/18083#discussion_r118432135
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/LiveListenerBus.scala ---
@@ -226,3 +240,34 @@ private[spark] object LiveListenerBus {
val name = "SparkListenerBus"
}
+private[spark] class LiveListenerBusMetrics(queue: LinkedBlockingQueue[_])
extends Source {
+ override val sourceName: String = "LiveListenerBus"
+ override val metricRegistry: MetricRegistry = new MetricRegistry
+
+ /**
+ * The total number of events posted to the LiveListenerBus. This counts
the number of times
+ * that `post()` is called, which might be less than the total number of
events processed in
+ * case events are dropped.
+ */
+ val numEventsReceived: Counter =
metricRegistry.counter(MetricRegistry.name("numEventsReceived"))
+
+ /**
+ * The total number of events that were dropped without being delivered
to listeners.
+ */
+ val numDroppedEvents: Counter =
metricRegistry.counter(MetricRegistry.name("numEventsDropped"))
+
+ /**
+ * The amount of time taken to post a single event to all listeners.
+ */
+ val eventProcessingTime: Timer =
metricRegistry.timer(MetricRegistry.name("eventProcessingTime"))
+
+ /**
+ * The number of of messages waiting in the queue.
+ */
+ val queueSize: Gauge[Int] = {
--- End diff --
It's the queue's _capacity_ that's fixed. In
https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/LinkedBlockingQueue.html
size refers to the number of items currently in the queue, whereas capacity
refers to the maximum number of items that the queue can hold. I think the
`spark.scheduler.listenerbus.eventqueue.size` configuration is confusingly
named.
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