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Merge pull request #443 from palantir/juang/cherry-pick-ae-02
[AE2.3-02][SPARK-23128] Add QueryStage and the framework for adaptive execution (auto setting the number of reducer)
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sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/PlanQueryStage.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.sql.execution.adaptive | ||
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| import scala.collection.mutable | ||
| import scala.collection.mutable.ArrayBuffer | ||
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| import org.apache.spark.sql.catalyst.rules.Rule | ||
| import org.apache.spark.sql.execution.SparkPlan | ||
| import org.apache.spark.sql.execution.command.ExecutedCommandExec | ||
| import org.apache.spark.sql.execution.exchange.{BroadcastExchangeExec, Exchange, ShuffleExchangeExec} | ||
| import org.apache.spark.sql.internal.SQLConf | ||
| import org.apache.spark.sql.types.StructType | ||
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| /** | ||
| * Divide the spark plan into multiple QueryStages. For each Exchange in the plan, it adds a | ||
| * QueryStage and a QueryStageInput. If reusing Exchange is enabled, it finds duplicated exchanges | ||
| * and uses the same QueryStage for all the references. | ||
| */ | ||
| case class PlanQueryStage(conf: SQLConf) extends Rule[SparkPlan] { | ||
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| def apply(plan: SparkPlan): SparkPlan = { | ||
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| val newPlan = if (!conf.exchangeReuseEnabled) { | ||
| plan.transformUp { | ||
| case e: ShuffleExchangeExec => | ||
| ShuffleQueryStageInput(ShuffleQueryStage(e), e.output) | ||
| case e: BroadcastExchangeExec => | ||
| BroadcastQueryStageInput(BroadcastQueryStage(e), e.output) | ||
| } | ||
| } else { | ||
| // Build a hash map using schema of exchanges to avoid O(N*N) sameResult calls. | ||
| val stages = mutable.HashMap[StructType, ArrayBuffer[QueryStage]]() | ||
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| plan.transformUp { | ||
| case exchange: Exchange => | ||
| val sameSchema = stages.getOrElseUpdate(exchange.schema, ArrayBuffer[QueryStage]()) | ||
| val samePlan = sameSchema.find { s => | ||
| exchange.sameResult(s.child) | ||
| } | ||
| if (samePlan.isDefined) { | ||
| // Keep the output of this exchange, the following plans require that to resolve | ||
| // attributes. | ||
| exchange match { | ||
| case e: ShuffleExchangeExec => ShuffleQueryStageInput( | ||
| samePlan.get.asInstanceOf[ShuffleQueryStage], exchange.output) | ||
| case e: BroadcastExchangeExec => BroadcastQueryStageInput( | ||
| samePlan.get.asInstanceOf[BroadcastQueryStage], exchange.output) | ||
| } | ||
| } else { | ||
| val queryStageInput = exchange match { | ||
| case e: ShuffleExchangeExec => | ||
| ShuffleQueryStageInput(ShuffleQueryStage(e), e.output) | ||
| case e: BroadcastExchangeExec => | ||
| BroadcastQueryStageInput(BroadcastQueryStage(e), e.output) | ||
| } | ||
| sameSchema += queryStageInput.childStage | ||
| queryStageInput | ||
| } | ||
| } | ||
| } | ||
| ResultQueryStage(newPlan) | ||
| } | ||
| } |
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