| /* |
| * 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 |
| |
| import java.io.Serializable |
| |
| import org.apache.spark.annotation.{DeveloperApi, Since} |
| |
| /** |
| * A factory to create [[PartitionEvaluator]]. Spark serializes and sends |
| * [[PartitionEvaluatorFactory]] to executors, and then creates [[PartitionEvaluator]] via the |
| * factory at the executor side. |
| */ |
| @DeveloperApi |
| @Since("3.5.0") |
| trait PartitionEvaluatorFactory[T, U] extends Serializable { |
| |
| /** |
| * Creates a partition evaluator. Each RDD partition will create one evaluator instance, which |
| * means one evaluator instance will be used by only one thread. |
| */ |
| def createEvaluator(): PartitionEvaluator[T, U] |
| } |
