spark StatefulOperatorPartitioning 源码
spark StatefulOperatorPartitioning 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StatefulOperatorPartitioning.scala
/*
* 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.sql.execution.streaming
import org.apache.spark.sql.catalyst.expressions.Expression
import org.apache.spark.sql.catalyst.plans.physical.{ClusteredDistribution, Distribution, StatefulOpClusteredDistribution}
import org.apache.spark.sql.internal.SQLConf
import org.apache.spark.sql.internal.SQLConf.STATEFUL_OPERATOR_USE_STRICT_DISTRIBUTION
/**
* This object is to provide clustered distribution for stateful operator with ensuring backward
* compatibility. Please read through the NOTE on the classdoc of
* [[StatefulOpClusteredDistribution]] before making any changes. Please refer SPARK-38204
* for details.
*
* Do not use methods in this object for stateful operators which already uses
* [[StatefulOpClusteredDistribution]] as its required child distribution.
*/
object StatefulOperatorPartitioning {
def getCompatibleDistribution(
expressions: Seq[Expression],
stateInfo: StatefulOperatorStateInfo,
conf: SQLConf): Distribution = {
getCompatibleDistribution(expressions, stateInfo.numPartitions, conf)
}
def getCompatibleDistribution(
expressions: Seq[Expression],
numPartitions: Int,
conf: SQLConf): Distribution = {
if (conf.getConf(STATEFUL_OPERATOR_USE_STRICT_DISTRIBUTION)) {
StatefulOpClusteredDistribution(expressions, numPartitions)
} else {
ClusteredDistribution(expressions, requiredNumPartitions = Some(numPartitions))
}
}
}
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