/*
* 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);
}
}