001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *      http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    
019    package org.apache.oozie.action.hadoop;
020    
021    import org.apache.hadoop.mapred.Counters;
022    import org.apache.hadoop.mapred.Counters.Counter;
023    import org.json.simple.JSONObject;
024    
025    /**
026     * Class to collect statistics for Map-Reduce action.
027     */
028    public class MRStats extends ActionStats {
029        public static final String ACTION_TYPE_LABEL = "ACTION_TYPE";
030        private Counters counters = null;
031    
032        public MRStats(Counters groups) {
033            this.currentActionType = ActionType.MAP_REDUCE;
034            this.counters = groups;
035        }
036    
037        @SuppressWarnings("unchecked")
038        @Override
039        public String toJSON() {
040            if (counters == null) {
041                return null;
042            }
043    
044            JSONObject groups = new JSONObject();
045            groups.put(ACTION_TYPE_LABEL, getCurrentActionType().toString());
046            for (String gName : counters.getGroupNames()) {
047                JSONObject group = new JSONObject();
048                for (Counter counter : counters.getGroup(gName)) {
049                    String cName = counter.getName();
050                    Long cValue = counter.getValue();
051                    group.put(cName, cValue);
052                }
053                groups.put(gName, group);
054            }
055            return groups.toJSONString();
056        }
057    }