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
020package org.apache.oozie.action.hadoop;
021
022import org.apache.hadoop.mapred.Counters;
023import org.apache.hadoop.mapred.Counters.Counter;
024import org.json.simple.JSONObject;
025
026/**
027 * Class to collect statistics for Map-Reduce action.
028 */
029public class MRStats extends ActionStats {
030    public static final String ACTION_TYPE_LABEL = "ACTION_TYPE";
031    private Counters counters = null;
032
033    public MRStats(Counters groups) {
034        this.currentActionType = ActionType.MAP_REDUCE;
035        this.counters = groups;
036    }
037
038    @SuppressWarnings("unchecked")
039    @Override
040    public String toJSON() {
041        if (counters == null) {
042            return null;
043        }
044
045        JSONObject groups = new JSONObject();
046        groups.put(ACTION_TYPE_LABEL, getCurrentActionType().toString());
047        for (String gName : counters.getGroupNames()) {
048            JSONObject group = new JSONObject();
049            for (Counter counter : counters.getGroup(gName)) {
050                String cName = counter.getName();
051                Long cValue = counter.getValue();
052                group.put(cName, cValue);
053            }
054            groups.put(gName, group);
055        }
056        return groups.toJSONString();
057    }
058}