bigtop-tests/spec-tests/runtime/src/main/java/org/odpi/specs/runtime/hive/HCatalogMR.java

/**
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.odpi.specs.runtime.hive;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.io.IntWritable;
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.util.GenericOptionsParser;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.hive.hcatalog.data.DefaultHCatRecord;
import org.apache.hive.hcatalog.data.HCatRecord;
import org.apache.hive.hcatalog.data.schema.HCatSchema;
import org.apache.hive.hcatalog.data.schema.HCatSchemaUtils;
import org.apache.hive.hcatalog.mapreduce.HCatInputFormat;
import org.apache.hive.hcatalog.mapreduce.HCatOutputFormat;
import org.apache.hive.hcatalog.mapreduce.OutputJobInfo;

import java.io.IOException;
import java.net.URI;
import java.util.StringTokenizer;

public class HCatalogMR extends Configured implements Tool {
  private final static String INPUT_SCHEMA = "odpi.test.hcat.schema.input";
  private final static String OUTPUT_SCHEMA = "odpi.test.hcat.schema.output";

  @Override
  public int run(String[] args) throws Exception {
    String inputTable = null;
    String outputTable = null;
    String inputSchemaStr = null;
    String outputSchemaStr = null;
    for(int i = 0; i < args.length; i++){
        if(args[i].equalsIgnoreCase("-it")){
            inputTable = args[i+1];
        }else if(args[i].equalsIgnoreCase("-ot")){
            outputTable = args[i+1];
        }else if(args[i].equalsIgnoreCase("-is")){
            inputSchemaStr = args[i+1];
        }else if(args[i].equalsIgnoreCase("-os")){
            outputSchemaStr = args[i+1];
        }
    }
    
    Configuration conf = getConf();
    args = new GenericOptionsParser(conf, args).getRemainingArgs();

    conf.set(INPUT_SCHEMA, inputSchemaStr);
    conf.set(OUTPUT_SCHEMA, outputSchemaStr);

    Job job = new Job(conf, "odpi_hcat_test");
    HCatInputFormat.setInput(job, "default", inputTable);

    job.setInputFormatClass(HCatInputFormat.class);
    job.setJarByClass(HCatalogMR.class);
    job.setMapperClass(Map.class);
    job.setReducerClass(Reduce.class);
    job.setMapOutputKeyClass(Text.class);
    job.setMapOutputValueClass(IntWritable.class);
    job.setOutputKeyClass(WritableComparable.class);
    job.setOutputValueClass(HCatRecord.class);
    HCatOutputFormat.setOutput(job, OutputJobInfo.create("default", outputTable, null));
    HCatOutputFormat.setSchema(job, HCatSchemaUtils.getHCatSchema(outputSchemaStr));
    job.setOutputFormatClass(HCatOutputFormat.class);

    return job.waitForCompletion(true) ? 0 : 1;


  }
  public static class Map extends Mapper<WritableComparable,
          HCatRecord, Text, IntWritable> {
    private final static IntWritable one = new IntWritable(1);
    private Text word = new Text();
    private HCatSchema inputSchema = null;

    @Override
    protected void map(WritableComparable key, HCatRecord value, Context context)
        throws IOException, InterruptedException {
      if (inputSchema == null) {
        inputSchema =
            HCatSchemaUtils.getHCatSchema(context.getConfiguration().get(INPUT_SCHEMA));
      }
      String line = value.getString("line", inputSchema);
      StringTokenizer tokenizer = new StringTokenizer(line);
      while (tokenizer.hasMoreTokens()) {
        word.set(tokenizer.nextToken());
        context.write(word, one);
      }
    }
  }

  public static class Reduce extends Reducer<Text, IntWritable, WritableComparable, HCatRecord> {
    private HCatSchema outputSchema = null;

    @Override
    protected void reduce(Text key, Iterable<IntWritable> values, Context context) throws
        IOException, InterruptedException {
      if (outputSchema == null) {
        outputSchema =
            HCatSchemaUtils.getHCatSchema(context.getConfiguration().get(OUTPUT_SCHEMA));
      }
      int sum = 0;
      for (IntWritable i : values) {
        sum += i.get();
      }
      HCatRecord output = new DefaultHCatRecord(2);
      output.set("word", outputSchema, key);
      output.set("count", outputSchema, sum);
      context.write(null, output);
    }
  }

  public static void main(String[] args) throws Exception {
    int exitCode = ToolRunner.run(new HCatalogMR(), args);
    System.exit(exitCode);
  }
 }