Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/3710#discussion_r22245060
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/scheduler/StreamingListenerBus.scala
---
@@ -17,20 +17,25 @@
package org.apache.spark.streaming.scheduler
-import org.apache.spark.Logging
-import scala.collection.mutable.{SynchronizedBuffer, ArrayBuffer}
+import java.util.concurrent.atomic.AtomicBoolean
import java.util.concurrent.LinkedBlockingQueue
+import java.util.concurrent.CopyOnWriteArrayList
+
+import scala.collection.JavaConversions._
+import scala.util.control.NonFatal
+
+import org.apache.spark.Logging
+import org.apache.spark.util.Utils
/** Asynchronously passes StreamingListenerEvents to registered
StreamingListeners. */
private[spark] class StreamingListenerBus() extends Logging {
- private val listeners = new ArrayBuffer[StreamingListener]()
- with SynchronizedBuffer[StreamingListener]
+ private val listeners = new CopyOnWriteArrayList[StreamingListener]()
--- End diff --
There is a implicit conversion going on between Java's CopyOnWriteArrayList
and Scala Iterable/Iterator every time foreach applied. I am not sure whether
that conversion is efficient, or if it is copying everything from the
underlying array. Might be better to use Java API directly.
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