@Override
public int run(String[] args) throws Exception {
JobConf conf = JobBuilder.parseInputAndOutput(this, getConf(), args);
if (conf == null) {
return -1;
}
conf.setInputFormat(SequenceFileInputFormat.class);
conf.setOutputKeyClass(IntWritable.class);
conf.setOutputFormat(SequenceFileOutputFormat.class);
SequenceFileOutputFormat.setCompressOutput(conf, true);
SequenceFileOutputFormat.setOutputCompressorClass(conf, GzipCodec.class);
SequenceFileOutputFormat.setOutputCompressionType(conf, CompressionType.BLOCK);
conf.setPartitionerClass(TotalOrderPartitioner.class);
InputSampler.Sampler<IntWritable, Text> sampler =
new InputSampler.RandomSampler<IntWritable, Text>(0.1, 10000, 10);
Path input = FileInputFormat.getInputPaths(conf)[0];
input = input.makeQualified(input.getFileSystem(conf));
Path partitionFile = new Path(input, "_partitions");
TotalOrderPartitioner.setPartitionFile(conf, partitionFile);
InputSampler.writePartitionFile(conf, sampler);
// Add to DistributedCache
URI partitionUri = new URI(partitionFile.toString() + "#_partitions");
DistributedCache.addCacheFile(partitionUri, conf);
DistributedCache.createSymlink(conf);
JobClient.runJob(conf);
return 0;
}
@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;
}
@Override
public int run(String[] args) throws IOException {
JobConf conf = JobBuilder.parseInputAndOutput(this, getConf(), args);
if (conf == null) {
return -1;
}
conf.setMapperClass(StationMapper.class);
conf.setMapOutputKeyClass(Text.class);
conf.setReducerClass(MultipleOutputsReducer.class);
conf.setOutputKeyClass(NullWritable.class);
conf.setOutputFormat(NullOutputFormat.class); // suppress empty part file
MultipleOutputs.addMultiNamedOutput(
conf, "station", TextOutputFormat.class, NullWritable.class, Text.class);
JobClient.runJob(conf);
return 0;
}