@Override public int run(String[] args) throws IOException { JobConf conf = JobBuilder.parseInputAndOutput(this, getConf(), args); if (conf == null) { return -1; } conf.setMapperClass(MaxTemperatureMapper.class); /*[*/ conf.setPartitionerClass(FirstPartitioner.class); /*]*/ /*[*/ conf.setOutputKeyComparatorClass(KeyComparator.class); /*]*/ /*[*/ conf.setOutputValueGroupingComparator(GroupComparator.class); /*]*/ conf.setReducerClass(MaxTemperatureReducer.class); conf.setOutputKeyClass(IntPair.class); conf.setOutputValueClass(NullWritable.class); JobClient.runJob(conf); return 0; }