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 */
018package org.apache.oozie.action.hadoop;
019
020import org.apache.hadoop.conf.Configuration;
021import org.apache.oozie.DagELFunctions;
022import org.apache.oozie.service.HadoopAccessorService;
023import org.apache.oozie.service.Services;
024import org.apache.oozie.util.ELEvaluationException;
025import org.apache.oozie.util.XLog;
026import org.apache.oozie.workflow.WorkflowInstance;
027import org.json.simple.JSONValue;
028
029import java.util.Map;
030
031/**
032 * Hadoop EL functions.
033 */
034public class HadoopELFunctions {
035
036    private static final String HADOOP_COUNTERS = "oozie.el.action.hadoop.counters";
037
038    public static final String RECORDS = "org.apache.hadoop.mapred.Task$Counter";
039    public static final String MAP_IN = "MAP_INPUT_RECORDS";
040    public static final String MAP_OUT = "MAP_OUTPUT_RECORDS";
041    public static final String REDUCE_IN = "REDUCE_INPUT_RECORDS";
042    public static final String REDUCE_OUT = "REDUCE_OUTPUT_RECORDS";
043    public static final String GROUPS = "REDUCE_INPUT_GROUPS";
044
045    private static final String RECORDS_023 = "org.apache.hadoop.mapreduce.TaskCounter";
046
047    @SuppressWarnings("unchecked")
048    public static Map<String, Map<String, Long>> hadoop_counters(String nodeName) throws ELEvaluationException {
049        WorkflowInstance instance = DagELFunctions.getWorkflow().getWorkflowInstance();
050        Object obj = instance.getTransientVar(nodeName + WorkflowInstance.NODE_VAR_SEPARATOR + HADOOP_COUNTERS);
051        Map<String, Map<String, Long>> counters = (Map<String, Map<String, Long>>) obj;
052        if (counters == null) {
053            counters = getCounters(nodeName);
054            // In Hadoop 0.23 they deprecated 'org.apache.hadoop.mapred.Task$Counter' and they REMOVED IT
055            // Here we are getting the new Name and inserting it using the old name if the old name is not found
056            if (counters.get(RECORDS) == null) {
057                counters.put(RECORDS, counters.get(RECORDS_023));
058            }
059            instance.setTransientVar(nodeName + WorkflowInstance.NODE_VAR_SEPARATOR + HADOOP_COUNTERS, counters);
060        }
061        return counters;
062    }
063
064    public static String hadoop_conf(String hadoopConfHostPort, String propName) {
065        Configuration conf = Services.get().get(HadoopAccessorService.class)
066            .createJobConf(hadoopConfHostPort);
067        String prop = conf.get(propName);
068        if (prop == null || prop.equals("")) {
069            conf = new Configuration();
070            prop = conf.get(propName);
071        }
072        if (prop == null)
073            prop = "";
074        return prop;
075    }
076
077    @SuppressWarnings("unchecked")
078    private static Map<String, Map<String, Long>> getCounters(String nodeName) throws ELEvaluationException {
079        String jsonCounters = DagELFunctions.getActionVar(nodeName, MapReduceActionExecutor.HADOOP_COUNTERS);
080        if (jsonCounters == null) {
081            throw new IllegalArgumentException(XLog.format("Hadoop counters not available for action [{0}]", nodeName));
082        }
083        return (Map) JSONValue.parse(jsonCounters);
084    }
085
086}