Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/7415#discussion_r34709788
--- Diff: mllib/src/main/scala/org/apache/spark/ml/util/stopwatches.scala
---
@@ -0,0 +1,152 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.ml.util
+
+import scala.collection.mutable
+
+import org.apache.spark.{Accumulator, SparkContext}
+
+/**
+ * Abstract class for stopwatches.
+ */
+private[spark] abstract class Stopwatch extends Serializable {
+
+ @transient private var running: Boolean = false
+ private var startTime: Long = _
+
+ /**
+ * Name of the stopwatch.
+ */
+ val name: String
+
+ /**
+ * Starts the stopwatch.
+ * Throws an exception if the stopwatch is already running.
+ */
+ def start(): Unit = {
+ assume(!running, "start() called but the stopwatch is already
running.")
+ running = true
+ startTime = now
+ }
+
+ /**
+ * Stops the stopwatch and returns the duration of the last session in
milliseconds.
+ * Throws an exception if the stopwatch is not running.
+ */
+ def stop(): Long = {
+ assume(running, "stop() called but the stopwatch is not running.")
+ val duration = now - startTime
+ add(duration)
+ running = false
+ duration
+ }
+
+ /**
+ * Checks whether the stopwatch is running.
+ */
+ def isRunning: Boolean = running
+
+ /**
+ * Returns total elapsed time in milliseconds, not counting the current
session if the stopwatch
+ * is running.
+ */
+ def elapsed(): Long
+
+ /**
+ * Gets the current time in milliseconds.
+ */
+ protected def now: Long = System.currentTimeMillis()
+
+ /**
+ * Adds input duration to total elapsed time.
+ */
+ protected def add(duration: Long): Unit
+}
+
+/**
+ * A local [[Stopwatch]].
+ */
+private[spark] class LocalStopwatch(override val name: String) extends
Stopwatch {
+
+ private var elapsedTime: Long = 0L
+
+ override def elapsed(): Long = elapsedTime
+
+ override protected def add(duration: Long): Unit = {
+ elapsedTime += duration
+ }
+}
+
+/**
+ * A distributed [[Stopwatch]] using Spark accumulator.
+ * @param sc SparkContext
+ */
+private[spark] class DistributedStopwatch(
+ sc: SparkContext,
+ override val name: String) extends Stopwatch {
+
+ val elapsedTime: Accumulator[Long] = sc.accumulator(0L,
s"DistributedStopwatch($name)")
--- End diff --
private
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