| /* |
| * 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.pig.tools.pigstats.spark; |
| |
| |
| import java.io.Serializable; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.apache.spark.Accumulator; |
| import org.apache.spark.AccumulatorParam; |
| import org.apache.spark.api.java.JavaSparkContext; |
| |
| public abstract class SparkCounter<T> implements Serializable { |
| |
| private String name; |
| private String displayName; |
| private Accumulator<T> accumulator; |
| |
| public SparkCounter() { |
| // For serialization. |
| } |
| |
| public SparkCounter( |
| String name, |
| String displayName, |
| String groupName, |
| T initValue, |
| JavaSparkContext sparkContext) { |
| |
| this.name = name; |
| this.displayName = displayName; |
| |
| String accumulatorName = groupName + "_" + name; |
| |
| if (sparkContext == null){ |
| //Spark executors can register new Accumulators but they won't make it back to the driver hence the limitation |
| throw new RuntimeException("Not allowed to create SparkCounter on backend executor."); |
| |
| } |
| this.accumulator = sparkContext.accumulator(initValue, accumulatorName, createAccumulatorParam()); |
| |
| } |
| |
| protected abstract AccumulatorParam<T> createAccumulatorParam(); |
| |
| public T getValue() { |
| if (accumulator != null) { |
| return accumulator.value(); |
| } else { |
| return null; |
| } |
| } |
| |
| public void increment(T incr) { |
| accumulator.add(incr); |
| } |
| |
| public String getName() { |
| return name; |
| } |
| |
| public String getDisplayName() { |
| return displayName; |
| } |
| |
| public void setDisplayName(String displayName) { |
| this.displayName = displayName; |
| } |
| |
| public static class LongSparkCounter extends SparkCounter<Long> { |
| |
| public LongSparkCounter(){} |
| |
| public LongSparkCounter( |
| String name, |
| String displayName, |
| String groupName, |
| Long initValue, |
| JavaSparkContext sparkContext){ |
| super(name, displayName, groupName, initValue, sparkContext); |
| } |
| |
| @Override |
| protected AccumulatorParam<Long> createAccumulatorParam() { |
| return new LongAccumulatorParam(); |
| } |
| |
| private class LongAccumulatorParam implements AccumulatorParam<Long> { |
| |
| @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; |
| } |
| } |
| } |
| |
| public static class MapSparkCounter extends SparkCounter<Map<String,Long>> { |
| |
| public MapSparkCounter(){} |
| |
| public MapSparkCounter( |
| String name, |
| String displayName, |
| String groupName, |
| Map<String,Long> initValue, |
| JavaSparkContext sparkContext){ |
| super(name, displayName, groupName, initValue, sparkContext); |
| } |
| |
| @Override |
| protected AccumulatorParam<Map<String, Long>> createAccumulatorParam() { |
| return new MapAccumulatorParam(); |
| } |
| |
| private class MapAccumulatorParam implements AccumulatorParam<Map<String,Long>> { |
| |
| @Override |
| public Map<String, Long> addAccumulator(Map<String, Long> t1, Map<String, Long> t2) { |
| return addInPlace(t1, t2); |
| } |
| |
| @Override |
| public Map<String, Long> addInPlace(Map<String, Long> r1, Map<String, Long> r2) { |
| for (String key : r2.keySet()){ |
| Long r1val = r1.get(key); |
| Long r2val = r2.get(key); |
| r1.put(key,r1val == null ? r2val : r1val+r2val); |
| } |
| return r1; |
| } |
| |
| @Override |
| public Map<String, Long> zero(Map<String, Long> initialValue) { |
| return new HashMap<>(); |
| } |
| } |
| } |
| |
| } |