001    /**
002     * Copyright (c) 2010 Yahoo! Inc. All rights reserved.
003     * Licensed under the Apache License, Version 2.0 (the "License");
004     * you may not use this file except in compliance with the License.
005     * You may obtain a copy of the License at
006     *
007     *   http://www.apache.org/licenses/LICENSE-2.0
008     *
009     *  Unless required by applicable law or agreed to in writing, software
010     *  distributed under the License is distributed on an "AS IS" BASIS,
011     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012     *  See the License for the specific language governing permissions and
013     *  limitations under the License. See accompanying LICENSE file.
014     */
015    package org.apache.oozie.command.wf;
016    
017    import org.apache.hadoop.conf.Configuration;
018    import org.apache.oozie.service.WorkflowAppService;
019    import org.apache.oozie.util.XmlUtils;
020    import org.jdom.Element;
021    import org.jdom.Namespace;
022    import org.apache.oozie.client.XOozieClient;
023    
024    import java.util.HashSet;
025    import java.util.Iterator;
026    import java.util.Map;
027    import java.util.Set;
028    
029    public class SubmitMRCommand extends SubmitHttpCommand {
030        private static final Set<String> SKIPPED_CONFS = new HashSet<String>();
031    
032        public SubmitMRCommand(Configuration conf, String authToken) {
033            super("submitMR", "submitMR", conf, authToken);
034        }
035    
036        static {
037            SKIPPED_CONFS.add(WorkflowAppService.HADOOP_USER);
038            SKIPPED_CONFS.add(WorkflowAppService.HADOOP_UGI);
039            SKIPPED_CONFS.add(XOozieClient.JT);
040            SKIPPED_CONFS.add(XOozieClient.NN);
041            SKIPPED_CONFS.add(WorkflowAppService.HADOOP_JT_KERBEROS_NAME);
042            SKIPPED_CONFS.add(WorkflowAppService.HADOOP_NN_KERBEROS_NAME);
043        }
044    
045        private Element generateConfigurationSection(Configuration conf, Namespace ns) {
046            Element configuration = null;
047            Iterator<Map.Entry<String, String>> iter = conf.iterator();
048            while (iter.hasNext()) {
049                Map.Entry<String, String> entry = iter.next();
050                String name = entry.getKey();
051                if (MANDATORY_OOZIE_CONFS.contains(name) || OPTIONAL_OOZIE_CONFS.contains(name)
052                        || SKIPPED_CONFS.contains(name)) {
053                    continue;
054                }
055    
056                if (configuration == null) {
057                    configuration = new Element("configuration", ns);
058                }
059    
060                String value = entry.getValue();
061                Element property = new Element("property", ns);
062                Element nameElement = new Element("name", ns);
063                nameElement.addContent(name != null ? name : "");
064                property.addContent(nameElement);
065                Element valueElement = new Element("value", ns);
066                valueElement.addContent(value != null ? value : "");
067                property.addContent(valueElement);
068                configuration.addContent(property);
069            }
070    
071            return configuration;
072        }
073    
074        private Element generateMRSection(Configuration conf, Namespace ns) {
075            Element mapreduce = new Element("map-reduce", ns);
076            Element jt = new Element("job-tracker", ns);
077            jt.addContent(conf.get(XOozieClient.JT));
078            mapreduce.addContent(jt);
079            Element nn = new Element("name-node", ns);
080            nn.addContent(conf.get(XOozieClient.NN));
081            mapreduce.addContent(nn);
082    
083            if (conf.size() > MANDATORY_OOZIE_CONFS.size()) { // excluding JT, NN,
084                                                              // LIBPATH
085                // configuration section
086                Element configuration = generateConfigurationSection(conf, ns);
087                if (configuration != null) {
088                    mapreduce.addContent(configuration);
089                }
090    
091                // file section
092                addFileSection(mapreduce, conf, ns);
093    
094                // archive section
095                addArchiveSection(mapreduce, conf, ns);
096            }
097    
098            return mapreduce;
099        }
100    
101        /*
102         * (non-Javadoc)
103         *
104         * @see
105         * org.apache.oozie.command.wf.SubmitHttpCommand#getWorkflowXml(org.apache
106         * .hadoop.conf.Configuration)
107         */
108        @Override
109        protected String getWorkflowXml(Configuration conf) {
110            for (String key : MANDATORY_OOZIE_CONFS) {
111                String value = conf.get(key);
112                if (value == null) {
113                    throw new RuntimeException(key + " is not specified");
114                }
115            }
116    
117            Namespace ns = Namespace.getNamespace("uri:oozie:workflow:0.2");
118            Element root = new Element("workflow-app", ns);
119            root.setAttribute("name", "oozie-mapreduce");
120    
121            Element start = new Element("start", ns);
122            start.setAttribute("to", "hadoop1");
123            root.addContent(start);
124    
125            Element action = new Element("action", ns);
126            action.setAttribute("name", "hadoop1");
127    
128            Element mapreduce = generateMRSection(conf, ns);
129            action.addContent(mapreduce);
130    
131            Element ok = new Element("ok", ns);
132            ok.setAttribute("to", "end");
133            action.addContent(ok);
134    
135            Element error = new Element("error", ns);
136            error.setAttribute("to", "fail");
137            action.addContent(error);
138    
139            root.addContent(action);
140    
141            Element kill = new Element("kill", ns);
142            kill.setAttribute("name", "fail");
143            Element message = new Element("message", ns);
144            message.addContent("Map/Reduce failed, error message[${wf:errorMessage(wf:lastErrorNode())}]");
145            kill.addContent(message);
146            root.addContent(kill);
147    
148            Element end = new Element("end", ns);
149            end.setAttribute("name", "end");
150            root.addContent(end);
151    
152            return XmlUtils.prettyPrint(root).toString();
153        }
154    }