    001/*
    002 * Copyright (c) 2007-2016 Concurrent, Inc. All Rights Reserved.
    003 *
    004 * Project and contact information: http://www.cascading.org/
    005 *
    006 * This file is part of the Cascading project.
    007 *
    008 * Licensed under the Apache License, Version 2.0 (the "License");
    009 * you may not use this file except in compliance with the License.
    010 * You may obtain a copy of the License at
    011 *
    012 *     http://www.apache.org/licenses/LICENSE-2.0
    013 *
    014 * Unless required by applicable law or agreed to in writing, software
    015 * distributed under the License is distributed on an "AS IS" BASIS,
    016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    017 * See the License for the specific language governing permissions and
    018 * limitations under the License.
    019 */
    020
    021package cascading.stats.hadoop;
    022
    023import java.io.IOException;
    024import java.util.Collection;
    025import java.util.HashSet;
    026import java.util.LinkedHashSet;
    027import java.util.Set;
    028
    029import cascading.stats.CascadingStats;
    030import org.apache.hadoop.conf.Configuration;
    031import org.apache.hadoop.mapred.RunningJob;
    032import org.apache.hadoop.mapreduce.Counter;
    033import org.apache.hadoop.mapreduce.CounterGroup;
    034import org.apache.hadoop.mapreduce.Counters;
    035
    036/**
    037 *
    038 */
    039public abstract class HadoopStepCounterCache extends HadoopCounterCache<RunningJob, Counters>
    040  {
    041  protected HadoopStepCounterCache( CascadingStats stats, Configuration configuration )
    042    {
    043    super( stats, configuration );
    044    }
    045
    046  @Override
    047  protected boolean areCountersAvailable( RunningJob runningJob )
    048    {
    049    return true;
    050    }
    051
    052  @Override
    053  protected Counters getCounters( RunningJob runningJob ) throws IOException
    054    {
    055    return HadoopStepStats.getJob( runningJob ).getCounters();
    056    }
    057
    058  @Override
    059  protected Collection<String> getGroupNames( Counters groups )
    060    {
    061    LinkedHashSet<String> result = new LinkedHashSet<>();
    062
    063    for( String value : groups.getGroupNames() )
    064      result.add( value );
    065
    066    return result;
    067    }
    068
    069  @Override
    070  protected Set<String> getCountersFor( Counters counters, String group )
    071    {
    072    Set<String> results = new HashSet<>();
    073
    074    for( Counter counter : counters.getGroup( group ) )
    075      results.add( counter.getName() );
    076
    077    return results;
    078    }
    079
    080  @Override
    081  protected long getCounterValue( Counters counters, Enum counter )
    082    {
    083    Counter result = counters.findCounter( counter );
    084
    085    if( result == null )
    086      return 0;
    087
    088    return result.getValue();
    089    }
    090
    091  @Override
    092  protected long getCounterValue( Counters counters, String groupName, String counterName )
    093    {
    094    CounterGroup counterGroup = counters.getGroup( groupName );
    095
    096    if( counterGroup == null )
    097      return 0;
    098
    099    // getCounter actually searches the display name, wtf
    100    // in theory this is lazily created if does not exist, but don't rely on it
    101    Counter counterValue = counterGroup.findCounter( counterName );
    102
    103    if( counterValue == null )
    104      return 0;
    105
    106    return counterValue.getValue();
    107    }
    108  }