| /** |
| * 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.IOException; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.conf.Configured; |
| import org.apache.hadoop.io.WritableComparable; |
| import org.apache.hadoop.mapreduce.Job; |
| import org.apache.hadoop.mapreduce.Mapper; |
| import org.apache.hadoop.util.GenericOptionsParser; |
| import org.apache.hadoop.util.Tool; |
| import org.apache.hadoop.util.ToolRunner; |
| import org.apache.hcatalog.common.HCatConstants; |
| import org.apache.hcatalog.data.DefaultHCatRecord; |
| import org.apache.hcatalog.data.HCatRecord; |
| import org.apache.hcatalog.data.schema.HCatSchema; |
| import org.apache.hcatalog.mapreduce.HCatInputFormat; |
| import org.apache.hcatalog.mapreduce.HCatOutputFormat; |
| import org.apache.hcatalog.mapreduce.InputJobInfo; |
| import org.apache.hcatalog.mapreduce.OutputJobInfo; |
| |
| /** |
| * This is a map reduce test for testing hcat which goes against the "numbers" |
| * table. It performs a group by on the first column and a SUM operation on the |
| * other columns. This is to simulate a typical operation in a map reduce |
| * program to test that hcat hands the right data to the map reduce program |
| * |
| * Usage: hadoop jar sumnumbers <serveruri> <output dir> <-libjars hive-hcat |
| * jar> The <tab|ctrla> argument controls the output delimiter The hcat jar |
| * location should be specified as file://<full path to jar> |
| */ |
| public class WriteText extends Configured implements Tool { |
| |
| public static class Map extends |
| Mapper<WritableComparable, HCatRecord, WritableComparable, HCatRecord> { |
| |
| byte t; |
| short si; |
| int i; |
| long b; |
| float f; |
| double d; |
| String s; |
| |
| @Override |
| protected void map( |
| WritableComparable key, |
| HCatRecord value, |
| org.apache.hadoop.mapreduce.Mapper<WritableComparable, HCatRecord, WritableComparable, HCatRecord>.Context context) |
| throws IOException, InterruptedException { |
| t = (Byte)value.get(0); |
| si = (Short)value.get(1); |
| i = (Integer)value.get(2); |
| b = (Long)value.get(3); |
| f = (Float)value.get(4); |
| d = (Double)value.get(5); |
| s = (String)value.get(6); |
| |
| HCatRecord record = new DefaultHCatRecord(7); |
| record.set(0, t); |
| record.set(1, si); |
| record.set(2, i); |
| record.set(3, b); |
| record.set(4, f); |
| record.set(5, d); |
| record.set(6, s); |
| |
| context.write(null, record); |
| |
| } |
| } |
| |
| public int run(String[] args) throws Exception { |
| Configuration conf = getConf(); |
| args = new GenericOptionsParser(conf, args).getRemainingArgs(); |
| |
| String serverUri = args[0]; |
| String inputTableName = args[1]; |
| String outputTableName = args[2]; |
| String dbName = null; |
| |
| String principalID = System |
| .getProperty(HCatConstants.HCAT_METASTORE_PRINCIPAL); |
| if (principalID != null) |
| conf.set(HCatConstants.HCAT_METASTORE_PRINCIPAL, principalID); |
| Job job = new Job(conf, "WriteText"); |
| HCatInputFormat.setInput(job, InputJobInfo.create(dbName, |
| inputTableName, null)); |
| // initialize HCatOutputFormat |
| |
| job.setInputFormatClass(HCatInputFormat.class); |
| job.setJarByClass(WriteText.class); |
| job.setMapperClass(Map.class); |
| job.setOutputKeyClass(WritableComparable.class); |
| job.setOutputValueClass(DefaultHCatRecord.class); |
| job.setNumReduceTasks(0); |
| HCatOutputFormat.setOutput(job, OutputJobInfo.create(dbName, |
| outputTableName, null)); |
| HCatSchema s = HCatInputFormat.getTableSchema(job); |
| System.err.println("INFO: output schema explicitly set for writing:" |
| + s); |
| HCatOutputFormat.setSchema(job, s); |
| job.setOutputFormatClass(HCatOutputFormat.class); |
| return (job.waitForCompletion(true) ? 0 : 1); |
| } |
| |
| public static void main(String[] args) throws Exception { |
| int exitCode = ToolRunner.run(new WriteText(), args); |
| System.exit(exitCode); |
| } |
| } |