| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.hcatalog.utils; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.FileOutputStream; |
| import java.io.FileReader; |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutputStream; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Properties; |
| import java.util.Map.Entry; |
| |
| import org.apache.hcatalog.common.HCatException; |
| import org.apache.hcatalog.data.transfer.DataTransferFactory; |
| import org.apache.hcatalog.data.transfer.HCatWriter; |
| import org.apache.hcatalog.data.transfer.WriteEntity; |
| import org.apache.hcatalog.data.transfer.WriterContext; |
| |
| public class DataWriterMaster { |
| |
| public static void main(String[] args) throws FileNotFoundException, IOException, ClassNotFoundException { |
| |
| // This config contains all the configuration that master node wants to provide |
| // to the HCatalog. |
| Properties externalConfigs = new Properties(); |
| externalConfigs.load(new FileReader(args[0])); |
| Map<String,String> config = new HashMap<String, String>(); |
| |
| for (Entry<Object, Object> kv : externalConfigs.entrySet()){ |
| System.err.println("k: " + kv.getKey() + "\t v: " + kv.getValue()); |
| config.put((String)kv.getKey(), (String)kv.getValue()); |
| } |
| |
| if(args.length == 3 && "commit".equalsIgnoreCase(args[2])){ |
| // Then, master commits if everything goes well. |
| ObjectInputStream ois = new ObjectInputStream(new FileInputStream(new File(args[1]))); |
| WriterContext cntxt = (WriterContext)ois.readObject(); |
| commit(config,true, cntxt); |
| System.exit(0); |
| } |
| // This piece of code runs in master node and gets necessary context. |
| WriterContext cntxt = runsInMaster(config); |
| |
| |
| // Master node will serialize writercontext and will make it available at slaves. |
| File f = new File(args[1]); |
| f.delete(); |
| ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(f)); |
| oos.writeObject(cntxt); |
| oos.flush(); |
| oos.close(); |
| } |
| |
| private static WriterContext runsInMaster(Map<String, String> config) throws HCatException { |
| |
| WriteEntity.Builder builder = new WriteEntity.Builder(); |
| WriteEntity entity = builder.withTable(config.get("table")).build(); |
| HCatWriter writer = DataTransferFactory.getHCatWriter(entity, config); |
| WriterContext info = writer.prepareWrite(); |
| return info; |
| } |
| |
| private static void commit(Map<String, String> config, boolean status, WriterContext cntxt) throws HCatException { |
| |
| WriteEntity.Builder builder = new WriteEntity.Builder(); |
| WriteEntity entity = builder.withTable(config.get("table")).build(); |
| HCatWriter writer = DataTransferFactory.getHCatWriter(entity, config); |
| if(status){ |
| writer.commit(cntxt); |
| } else { |
| writer.abort(cntxt); |
| } |
| } |
| } |