spark ApproximateEvaluator 源码
spark ApproximateEvaluator 代码
文件路径：/core/src/main/scala/org/apache/spark/partial/ApproximateEvaluator.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.partial
/**
* An object that computes a function incrementally by merging in results of type U from multiple
* tasks. Allows partial evaluation at any point by calling currentResult().
*/
private[spark] trait ApproximateEvaluator[U, R] {
def merge(outputId: Int, taskResult: U): Unit
def currentResult(): R
}
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