Github user sryza commented on a diff in the pull request:
https://github.com/apache/spark/pull/4155#discussion_r23700080
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/OutputCommitCoordinator.scala ---
@@ -0,0 +1,258 @@
+/*
+ * 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.scheduler
+
+import java.util.concurrent.{ExecutorService, TimeUnit, ConcurrentHashMap}
+
+import scala.collection.{Map => ScalaImmutableMap}
+import scala.collection.convert.decorateAsScala._
+
+import akka.actor.{ActorRef, Actor}
+
+import org.apache.spark.{SparkConf, Logging}
+import org.apache.spark.util.{Utils, AkkaUtils, ActorLogReceive}
+
+private[spark] sealed trait OutputCommitCoordinationMessage
+
+private[spark] case class StageStarted(stage: Int, partitionIds: Seq[Int])
+ extends OutputCommitCoordinationMessage
+private[spark] case class StageEnded(stage: Int) extends
OutputCommitCoordinationMessage
+private[spark] case object StopCoordinator extends
OutputCommitCoordinationMessage
+
+private[spark] case class AskPermissionToCommitOutput(
+ stage: Int,
+ task: Long,
+ partId: Int,
+ taskAttempt: Long)
+ extends OutputCommitCoordinationMessage with Serializable
+
+private[spark] case class TaskCompleted(
+ stage: Int,
+ task: Long,
+ partId: Int,
+ attempt: Long,
+ successful: Boolean)
+ extends OutputCommitCoordinationMessage
+
+/**
+ * Authority that decides whether tasks can commit output to HDFS.
--- End diff --
Can this comment be augmented a little bit to describe a situation in which
committing might be denied?
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