| /** |
| * 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.fs.Path; |
| import org.apache.hadoop.io.LongWritable; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.io.WritableComparable; |
| import org.apache.hadoop.mapreduce.Job; |
| import org.apache.hadoop.mapreduce.Mapper; |
| import org.apache.hadoop.mapreduce.Reducer; |
| import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; |
| import org.apache.hadoop.mapreduce.lib.input.TextInputFormat; |
| import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat; |
| 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.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 HBaseReadWrite extends Configured implements Tool { |
| |
| public static class HBaseWriteMap extends |
| Mapper<LongWritable, Text, Text, Text> { |
| |
| String name; |
| String age; |
| String gpa; |
| |
| @Override |
| protected void map( |
| LongWritable key, |
| Text value, |
| org.apache.hadoop.mapreduce.Mapper<LongWritable, Text, Text, Text>.Context context) |
| throws IOException, InterruptedException { |
| String line = value.toString(); |
| String[] tokens = line.split("\t"); |
| name = tokens[0]; |
| |
| context.write(new Text(name), value); |
| } |
| } |
| |
| |
| public static class HBaseWriteReduce extends |
| Reducer<Text, Text, WritableComparable, HCatRecord> { |
| |
| String name; |
| String age; |
| String gpa; |
| |
| @Override |
| protected void reduce(Text key, Iterable<Text> values, Context context) |
| throws IOException, InterruptedException { |
| name = key.toString(); |
| int count = 0; |
| double sum = 0; |
| for (Text value : values) { |
| String line = value.toString(); |
| String[] tokens = line.split("\t"); |
| name = tokens[0]; |
| age = tokens[1]; |
| gpa = tokens[2]; |
| |
| count++; |
| sum += Double.parseDouble(gpa.toString()); |
| } |
| |
| HCatRecord record = new DefaultHCatRecord(2); |
| record.set(0, name); |
| record.set(1, Double.toString(sum)); |
| |
| context.write(null, record); |
| } |
| } |
| |
| public static class HBaseReadMap extends |
| Mapper<WritableComparable, HCatRecord, Text, Text> { |
| |
| String name; |
| String age; |
| String gpa; |
| |
| @Override |
| protected void map( |
| WritableComparable key, |
| HCatRecord value, |
| org.apache.hadoop.mapreduce.Mapper<WritableComparable, HCatRecord, Text, Text>.Context context) |
| throws IOException, InterruptedException { |
| name = (String) value.get(0); |
| gpa = (String) value.get(1); |
| context.write(new Text(name), new Text(gpa)); |
| } |
| } |
| |
| |
| public int run(String[] args) throws Exception { |
| Configuration conf = getConf(); |
| args = new GenericOptionsParser(conf, args).getRemainingArgs(); |
| |
| String serverUri = args[0]; |
| String inputDir = args[1]; |
| String tableName = args[2]; |
| String outputDir = args[3]; |
| String dbName = null; |
| |
| String principalID = System |
| .getProperty(HCatConstants.HCAT_METASTORE_PRINCIPAL); |
| if (principalID != null) |
| conf.set(HCatConstants.HCAT_METASTORE_PRINCIPAL, principalID); |
| conf.set("hcat.hbase.output.bulkMode", "false"); |
| Job job = new Job(conf, "HBaseWrite"); |
| FileInputFormat.setInputPaths(job, inputDir); |
| |
| job.setInputFormatClass(TextInputFormat.class); |
| job.setOutputFormatClass(HCatOutputFormat.class); |
| job.setJarByClass(HBaseReadWrite.class); |
| job.setMapperClass(HBaseWriteMap.class); |
| job.setMapOutputKeyClass(Text.class); |
| job.setMapOutputValueClass(Text.class); |
| job.setReducerClass(HBaseWriteReduce.class); |
| job.setOutputKeyClass(WritableComparable.class); |
| job.setOutputValueClass(DefaultHCatRecord.class); |
| HCatOutputFormat.setOutput(job, OutputJobInfo.create(dbName, |
| tableName, null)); |
| |
| boolean succ = job.waitForCompletion(true); |
| |
| if (!succ) return 1; |
| |
| job = new Job(conf, "HBaseRead"); |
| HCatInputFormat.setInput(job, InputJobInfo.create(dbName, tableName, |
| null)); |
| |
| job.setInputFormatClass(HCatInputFormat.class); |
| job.setOutputFormatClass(TextOutputFormat.class); |
| job.setJarByClass(HBaseReadWrite.class); |
| job.setMapperClass(HBaseReadMap.class); |
| job.setOutputKeyClass(Text.class); |
| job.setOutputValueClass(Text.class); |
| job.setNumReduceTasks(0); |
| TextOutputFormat.setOutputPath(job, new Path(outputDir)); |
| |
| succ = job.waitForCompletion(true); |
| |
| if (!succ) return 2; |
| |
| return 0; |
| } |
| |
| public static void main(String[] args) throws Exception { |
| int exitCode = ToolRunner.run(new HBaseReadWrite(), args); |
| System.exit(exitCode); |
| } |
| } |
| |