package com.manning.hip.ch3.proto;
import com.hadoop.compression.lzo.LzopCodec;
import com.manning.hip.ch3.csv.CSVParser;
import com.twitter.elephantbird.mapreduce.input.LzoProtobufBlockInputFormat;
import com.twitter.elephantbird.mapreduce.io.*;
import com.twitter.elephantbird.mapreduce.output.LzoProtobufBlockOutputFormat;
import com.twitter.elephantbird.util.TypeRef;
import org.apache.commons.io.FileUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.*;
import org.apache.hadoop.io.*;
import org.apache.hadoop.mapreduce.*;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import java.io.*;
import static com.manning.hip.ch3.proto.StockProtos.*;
public class StockProtocolBuffersMapReduce {
public static class ProtobufStockWritable
extends ProtobufWritable<Stock> {
public ProtobufStockWritable() {
super(new TypeRef<Stock>() {
});
}
public ProtobufStockWritable(Stock m) {
super(m, new TypeRef<Stock>() {
});
}
}
public static void main(String... args) throws Exception {
File localStocksFile = new File(args[0]);
Path input = new Path(args[1]);
Path output = new Path(args[2]);
if (!input.getName().endsWith(".lzo")) {
throw new Exception("HDFS stock file must have a .lzo suffix");
}
Configuration conf = new Configuration();
output.getFileSystem(conf).delete(output, true);
generateInput(conf, localStocksFile, input);
Job job = new Job(conf);
job.setJobName(StockProtocolBuffersMapReduce.class.getName());
job.setJarByClass(StockProtocolBuffersMapReduce.class);
job.setMapperClass(PBMapper.class);
job.setReducerClass(PBReducer.class);
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(ProtobufStockWritable.class);
job.setInputFormatClass(
LzoProtobufBlockInputFormat
.getInputFormatClass(Stock.class,
job.getConfiguration()));
job.setOutputFormatClass(
LzoProtobufBlockOutputFormat.getOutputFormatClass(
StockAvg.class, job.getConfiguration()));
FileInputFormat.setInputPaths(job, input);
FileOutputFormat.setOutputPath(job, output);
job.waitForCompletion(true);
}
private static void generateInput(Configuration config,
File inputFile,
Path input) throws IOException {
FileSystem hdfs = FileSystem.get(config);
OutputStream os = hdfs.create(input);
LzopCodec codec = new LzopCodec();
codec.setConf(config);
OutputStream lzopOutputStream = codec.createOutputStream(os);
ProtobufBlockWriter<Stock> writer =
new ProtobufBlockWriter<Stock>(
lzopOutputStream, Stock.class);
for (String line : FileUtils.readLines(inputFile)) {
Stock stock = createStock(line);
writer.write(stock);
}
writer.finish();
writer.close();
IOUtils.closeStream(os);
}
static CSVParser parser = new CSVParser();
public static Stock createStock(String line) throws IOException {
String parts[] = parser.parseLine(line);
return Stock.newBuilder()
.setSymbol(parts[0])
.setDate(parts[1])
.setOpen(Double.valueOf(parts[2]))
.setHigh(Double.valueOf(parts[3]))
.setLow(Double.valueOf(parts[4]))
.setClose(Double.valueOf(parts[5]))
.setVolume(Integer.valueOf(parts[6]))
.setAdjClose(Double.valueOf(parts[7])).build();
}
public static class PBMapper extends
Mapper<LongWritable, ProtobufWritable<Stock>,
Text, ProtobufStockWritable> {
@Override
protected void map(LongWritable key,
ProtobufWritable<Stock> value,
Context context) throws IOException,
InterruptedException {
context.write(
new Text(value.get().getSymbol()),
new ProtobufStockWritable(value.get()));
}
}
public static class PBReducer extends
Reducer<Text, ProtobufStockWritable,
NullWritable, ProtobufWritable> {
private ProtobufWritable<StockAvg> stockAvg =
new ProtobufWritable<StockAvg>();
@Override
protected void reduce(Text symbol,
Iterable<ProtobufStockWritable> values,
Context context) throws IOException,
InterruptedException {
double total = 0.0;
double count = 0;
for (ProtobufStockWritable d : values) {
total += d.get().getOpen();
count++;
}
StockAvg avg = StockAvg.newBuilder()
.setSymbol(symbol.toString())
.setAvg(total / count).build();
stockAvg.set(avg);
context.write(NullWritable.get(), stockAvg);
}
}
}