Github user zsxwing commented on a diff in the pull request: https://github.com/apache/spark/pull/3710#discussion_r22246575 --- 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 -- Scala uses JIterableWrapper to wrapper a Java Iterable. It doesn't copy the data. However, using Java Iterator directly will avoid to create a JIterableWrapper every time. So I change to this way now.
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