Github user kayousterhout commented on a diff in the pull request:
https://github.com/apache/spark/pull/4708#discussion_r26594825
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/ShuffleMapStage.scala ---
@@ -0,0 +1,81 @@
+/*
+ * 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 org.apache.spark.rdd.RDD
+import org.apache.spark.ShuffleDependency
+import org.apache.spark.storage.BlockManagerId
+import org.apache.spark.util.CallSite
+
+private[spark] class ShuffleMapStage(
+ override val id: Int,
+ override val rdd: RDD[_],
+ override val numTasks: Int,
+ override val parents: List[Stage],
+ override val jobId: Int,
+ override val callSite: CallSite,
+ val shuffleDep: ShuffleDependency[_, _, _])
+ extends Stage(id, rdd, numTasks, parents, jobId, callSite) {
+
+ override def toString: String = "ShuffleMapStage " + id
+ override def isAvailable: Boolean = numAvailableOutputs == numPartitions
+
+ val outputLocs = Array.fill[List[MapStatus]](numPartitions)(Nil)
+
+ def addOutputLoc(partition: Int, status: MapStatus) {
+ val prevList = outputLocs(partition)
+ outputLocs(partition) = status :: prevList
+ if (prevList == Nil) {
+ numAvailableOutputs += 1
+ }
+ }
+
+ def removeOutputLoc(partition: Int, bmAddress: BlockManagerId) {
+ val prevList = outputLocs(partition)
+ val newList = prevList.filterNot(_.location == bmAddress)
+ outputLocs(partition) = newList
+ if (prevList != Nil && newList == Nil) {
+ numAvailableOutputs -= 1
+ }
+ }
+
+ /**
+ * Removes all shuffle outputs associated with this executor. Note that
this will also remove
+ * outputs which are served by an external shuffle server (if one
exists), as they are still
+ * registered with this execId.
+ */
+ def removeOutputsOnExecutor(execId: String) {
+ var becameUnavailable = false
+ for (partition <- 0 until numPartitions) {
+ val prevList = outputLocs(partition)
+ val newList = prevList.filterNot(_.location.executorId == execId)
+ outputLocs(partition) = newList
+ if (prevList != Nil && newList == Nil) {
+ becameUnavailable = true
+ numAvailableOutputs -= 1
+ }
+ }
+ if (becameUnavailable) {
+ logInfo("%s is now unavailable on executor %s (%d/%d, %s)".format(
+ this, execId, numAvailableOutputs, numPartitions, isAvailable))
+ }
+ }
+
+
--- End diff --
remove unnecessary newlines here and below
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