[SPARK-4485][SQL] (1) Add broadcast hash outer join, (2) Fix SparkPlanTest #7162
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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.joins | ||
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| import org.apache.spark.annotation.DeveloperApi | ||
| import org.apache.spark.rdd.RDD | ||
| import org.apache.spark.sql.catalyst.expressions._ | ||
| import org.apache.spark.sql.catalyst.plans.physical.{Distribution, UnspecifiedDistribution} | ||
| import org.apache.spark.sql.catalyst.plans.{JoinType, LeftOuter, RightOuter} | ||
| import org.apache.spark.sql.execution.{BinaryNode, SparkPlan} | ||
| import org.apache.spark.util.ThreadUtils | ||
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| import scala.concurrent._ | ||
| import scala.concurrent.duration._ | ||
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| /** | ||
| * :: DeveloperApi :: | ||
| * Performs a outer hash join for two child relations. When the output RDD of this operator is | ||
| * being constructed, a Spark job is asynchronously started to calculate the values for the | ||
| * broadcasted relation. This data is then placed in a Spark broadcast variable. The streamed | ||
| * relation is not shuffled. | ||
| */ | ||
| @DeveloperApi | ||
| case class BroadcastHashOuterJoin( | ||
| leftKeys: Seq[Expression], | ||
| rightKeys: Seq[Expression], | ||
| joinType: JoinType, | ||
| condition: Option[Expression], | ||
| left: SparkPlan, | ||
| right: SparkPlan) extends BinaryNode with HashOuterJoin { | ||
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| val timeout = { | ||
| val timeoutValue = sqlContext.conf.broadcastTimeout | ||
| if (timeoutValue < 0) { | ||
| Duration.Inf | ||
| } else { | ||
| timeoutValue.seconds | ||
| } | ||
| } | ||
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| override def requiredChildDistribution: Seq[Distribution] = | ||
| UnspecifiedDistribution :: UnspecifiedDistribution :: Nil | ||
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| private[this] lazy val (buildPlan, streamedPlan) = joinType match { | ||
| case RightOuter => (left, right) | ||
| case LeftOuter => (right, left) | ||
| case x => | ||
| throw new IllegalArgumentException( | ||
| s"BroadcastHashOuterJoin should not take $x as the JoinType") | ||
| } | ||
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| private[this] lazy val (buildKeys, streamedKeys) = joinType match { | ||
| case RightOuter => (leftKeys, rightKeys) | ||
| case LeftOuter => (rightKeys, leftKeys) | ||
| case x => | ||
| throw new IllegalArgumentException( | ||
| s"BroadcastHashOuterJoin should not take $x as the JoinType") | ||
| } | ||
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| @transient | ||
| private val broadcastFuture = future { | ||
| // Note that we use .execute().collect() because we don't want to convert data to Scala types | ||
| val input: Array[InternalRow] = buildPlan.execute().map(_.copy()).collect() | ||
| // buildHashTable uses code-generated rows as keys, which are not serializable | ||
| val hashed = new GeneralHashedRelation( | ||
| buildHashTable(input.iterator, newProjection(buildKeys, buildPlan.output))) | ||
|
There was a problem hiding this comment. @marmbrus Yeah, that's why I used GeneralHashedRelation to wrap the hash table. Which way do you think is better? There was a problem hiding this comment. This still fails for me when I run it on a real cluster. I'd just change this to |
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| sparkContext.broadcast(hashed) | ||
| }(BroadcastHashOuterJoin.broadcastHashOuterJoinExecutionContext) | ||
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| override def doExecute(): RDD[InternalRow] = { | ||
| val broadcastRelation = Await.result(broadcastFuture, timeout) | ||
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| streamedPlan.execute().mapPartitions { streamedIter => | ||
| val joinedRow = new JoinedRow() | ||
| val hashTable = broadcastRelation.value | ||
| val keyGenerator = newProjection(streamedKeys, streamedPlan.output) | ||
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| joinType match { | ||
| case LeftOuter => | ||
| streamedIter.flatMap(currentRow => { | ||
| val rowKey = keyGenerator(currentRow) | ||
| joinedRow.withLeft(currentRow) | ||
| leftOuterIterator(rowKey, joinedRow, hashTable.getOrElse(rowKey, EMPTY_LIST)) | ||
| }) | ||
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| case RightOuter => | ||
| streamedIter.flatMap(currentRow => { | ||
| val rowKey = keyGenerator(currentRow) | ||
| joinedRow.withRight(currentRow) | ||
| rightOuterIterator(rowKey, hashTable.getOrElse(rowKey, EMPTY_LIST), joinedRow) | ||
| }) | ||
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| case x => | ||
| throw new IllegalArgumentException( | ||
| s"BroadcastHashOuterJoin should not take $x as the JoinType") | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| object BroadcastHashOuterJoin { | ||
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| private val broadcastHashOuterJoinExecutionContext = ExecutionContext.fromExecutorService( | ||
| ThreadUtils.newDaemonCachedThreadPool("broadcast-hash-outer-join", 128)) | ||
|
There was a problem hiding this comment. It would probably be reasonable to have a single threadpool that we share for all broadcasting. |
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| } | ||
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can you use CanBroadcast here