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[SPARK-9851] Support submitting map stages individually in DAGScheduler
This patch adds support for submitting map stages in a DAG individually so that we can make downstream decisions after seeing statistics about their output, as part of SPARK-9850. I also added more comments to many of the key classes in DAGScheduler. By itself, the patch is not super useful except maybe to switch between a shuffle and broadcast join, but with the other subtasks of SPARK-9850 we'll be able to do more interesting decisions. The main entry point is SparkContext.submitMapStage, which lets you run a map stage and see stats about the map output sizes. Other stats could also be collected through accumulators. See AdaptiveSchedulingSuite for a short example. Author: Matei Zaharia <matei@databricks.com> Closes #8180 from mateiz/spark-9851.
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core/src/main/scala/org/apache/spark/MapOutputStatistics.scala
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/* | ||
* 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. | ||
*/ | ||
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package org.apache.spark | ||
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/** | ||
* Holds statistics about the output sizes in a map stage. May become a DeveloperApi in the future. | ||
* | ||
* @param shuffleId ID of the shuffle | ||
* @param bytesByPartitionId approximate number of output bytes for each map output partition | ||
* (may be inexact due to use of compressed map statuses) | ||
*/ | ||
private[spark] class MapOutputStatistics(val shuffleId: Int, val bytesByPartitionId: Array[Long]) |
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