| /* |
| * Copyright 2009-2013 by The Regents of the University of California |
| * Licensed 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 from |
| * |
| * 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 edu.uci.ics.pregelix.api.util; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.mapreduce.Counters; |
| |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.pregelix.api.job.IIterationCompleteReporterHook; |
| import edu.uci.ics.pregelix.api.job.PregelixJob; |
| |
| /** |
| * Hook that aggregates a mapreduce.Counters object across all |
| * iterations of a job, saving to HDFS |
| * |
| * @author wbiesing |
| */ |
| public class HadoopCountersGlobalAggregateHook implements IIterationCompleteReporterHook { |
| |
| @Override |
| public void completeIteration(int superstep, PregelixJob job) throws HyracksDataException { |
| Configuration conf = job.getConfiguration(); |
| String jobId = BspUtils.getJobId(conf); |
| Class<?> aggClass = conf.getClass(PregelixJob.COUNTERS_AGGREGATOR_CLASS, null); |
| if (aggClass == null) |
| throw new HyracksDataException( |
| "A subclass of HadoopCountersAggregator must active for GlobalAggregateCountersHook to operate!"); |
| Counters curIterCounters; |
| try { |
| curIterCounters = (Counters) BspUtils.readGlobalAggregateValue(conf, jobId, aggClass.getName()); |
| } catch (IllegalStateException e) { |
| throw new HyracksDataException( |
| "A subclass of HadoopCountersAggregator must active for GlobalAggregateCountersHook to operate!", e); |
| } |
| if (superstep > 1) { |
| Counters prevCounters = BspUtils.readCounters(superstep - 1, conf, jobId); // the counters from the previous iterations, all aggregated together |
| curIterCounters.incrAllCounters(prevCounters); // add my counters to previous ones |
| } |
| BspUtils.writeCounters(curIterCounters, superstep, conf, jobId); |
| BspUtils.writeCountersLastIteration(superstep, conf, jobId); |
| } |
| } |