| /* |
| * 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.counters; |
| |
| import java.util.Map; |
| |
| import org.apache.pig.impl.util.Pair; |
| import org.apache.pig.tools.pigstats.PigStatusReporter; |
| |
| import com.google.common.collect.Maps; |
| |
| /** |
| * A helper class to deal with Hadoop counters in Pig. They are stored within the singleton |
| * PigStatusReporter instance, but are null for some period of time at job startup, even after |
| * Pig has been invoked. This class buffers counters, trying each time to get a valid Reporter and flushing |
| * stored counters each time it does. |
| */ |
| public class PigCounterHelper { |
| private final Map<Pair<String, String>, Long> counterStringMap_ = Maps.newHashMap(); |
| private final Map<Enum<?>, Long> counterEnumMap_ = Maps.newHashMap(); |
| |
| /** |
| * Mocks the Reporter.incrCounter, but adds buffering. |
| * See org.apache.hadoop.mapred.Reporter's incrCounter. |
| */ |
| public void incrCounter(String group, String counterName, long incr) { |
| PigStatusReporter reporter = PigStatusReporter.getInstance(); |
| if (reporter != null && reporter.incrCounter(group, counterName, incr)) { // common case |
| if (counterStringMap_.size() > 0) { |
| for (Map.Entry<Pair<String, String>, Long> entry : counterStringMap_.entrySet()) { |
| reporter.incrCounter(entry.getKey().first, entry.getKey().second, entry.getValue()); |
| } |
| counterStringMap_.clear(); |
| } |
| return; |
| } |
| |
| // In the case when reporter is not available, or we can't get the |
| // Counter, store in the local map. |
| Pair<String, String> key = new Pair<String, String>(group, counterName); |
| Long currentValue = counterStringMap_.get(key); |
| counterStringMap_.put(key, (currentValue == null ? 0 : currentValue) + incr); |
| } |
| |
| /** |
| * Mocks the Reporter.incrCounter, but adds buffering. |
| * See org.apache.hadoop.mapred.Reporter's incrCounter. |
| */ |
| public void incrCounter(Enum<?> key, long incr) { |
| PigStatusReporter reporter = PigStatusReporter.getInstance(); |
| if (reporter != null && reporter.incrCounter(key, incr)) { // common case |
| if (counterEnumMap_.size() > 0) { |
| for (Map.Entry<Enum<?>, Long> entry : counterEnumMap_.entrySet()) { |
| reporter.getCounter(entry.getKey()).increment(entry.getValue()); |
| } |
| counterEnumMap_.clear(); |
| } |
| return; |
| } |
| |
| // In the case when reporter is not available, or we can't get the |
| // Counter, store in the local map. |
| Long currentValue = counterEnumMap_.get(key); |
| counterEnumMap_.put(key, (currentValue == null ? 0 : currentValue) + incr); |
| } |
| } |