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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. */ package org.apache.hive.spark.counter; import java.io.Serializable; import org.apache.spark.Accumulator; import org.apache.spark.AccumulatorParam; import org.apache.spark.api.java.JavaSparkContext; public class SparkCounter implements Serializable { private String name; private String displayName; private Accumulator accumulator; // Values of accumulators can only be read on the SparkContext side. This field is used when // creating a snapshot to be sent to the RSC client. private long accumValue; public SparkCounter() { // For serialization. } private SparkCounter( String name, String displayName, long value) { this.name = name; this.displayName = displayName; this.accumValue = value; } public SparkCounter( String name, String displayName, String groupName, long initValue, JavaSparkContext sparkContext) { this.name = name; this.displayName = displayName; LongAccumulatorParam longParam = new LongAccumulatorParam(); String accumulatorName = groupName + "_" + name; this.accumulator = sparkContext.accumulator(initValue, accumulatorName, longParam); } public long getValue() { if (accumulator != null) { return accumulator.value(); } else { return accumValue; } } public void increment(long incr) { accumulator.add(incr); } public String getName() { return name; } public String getDisplayName() { return displayName; } public void setDisplayName(String displayName) { this.displayName = displayName; } SparkCounter snapshot() { return new SparkCounter(name, displayName, accumulator.value()); } class LongAccumulatorParam implements AccumulatorParam { @Override public Long addAccumulator(Long t1, Long t2) { return t1 + t2; } @Override public Long addInPlace(Long r1, Long r2) { return r1 + r2; } @Override public Long zero(Long initialValue) { return 0L; } } }





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