package com.manning.hip.ch3.thrift;
import com.hadoop.compression.lzo.LzopCodec;
import com.manning.hip.ch3.csv.CSVParser;
import com.twitter.elephantbird.mapreduce.input.LzoThriftBlockInputFormat;
import com.twitter.elephantbird.mapreduce.io.*;
import com.twitter.elephantbird.mapreduce.output.LzoThriftBlockOutputFormat;
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.*;
public class ThriftStockMapReduce {
public static class StockWritable
extends ThriftWritable<Stock> {
public StockWritable() {
super(new TypeRef<Stock>() {
});
}
public StockWritable(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(ThriftStockMapReduce.class.getName());
job.setJarByClass(ThriftStockMapReduce.class);
job.setMapperClass(ThriftMapper.class);
job.setReducerClass(ThriftReducer.class);
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(StockWritable.class);
job.setInputFormatClass(
LzoThriftBlockInputFormat
.getInputFormatClass(Stock.class,
job.getConfiguration()));
job.setOutputFormatClass(
LzoThriftBlockOutputFormat.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);
ThriftBlockWriter<Stock> writer =
new ThriftBlockWriter<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 new Stock()
.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]));
}
public static class ThriftMapper extends
Mapper<LongWritable, ThriftWritable<Stock>,
Text, StockWritable> {
StockWritable tWritable = new StockWritable();
@Override
protected void map(LongWritable key,
ThriftWritable<Stock> stock,
Context context) throws IOException,
InterruptedException {
tWritable.set(stock.get());
context.write(
new Text(stock.get().getSymbol()),
tWritable);
}
}
public static class ThriftReducer extends
Reducer<Text, StockWritable,
NullWritable, ThriftWritable> {
ThriftWritable<StockAvg> tWritable =
ThriftWritable.newInstance(StockAvg.class);
StockAvg avg = new StockAvg();
@Override
protected void reduce(Text symbol,
Iterable<StockWritable> values,
Context context) throws IOException,
InterruptedException {
double total = 0.0;
double count = 0;
for (ThriftWritable<Stock> d : values) {
total += d.get().getOpen();
count++;
}
avg.setSymbol(symbol.toString())
.setAvg(total / count);
tWritable.set(avg);
context.write(NullWritable.get(), tWritable);
}
}
}