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Adding Java versions of Pi and LogQuery

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This commit is contained in:
Nick Pentreath 2013-03-15 10:52:01 +02:00
parent cbf8f0d4dd
commit 13757b1198
3 changed files with 161 additions and 0 deletions
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113
examples/src/main/java/spark/examples/JavaLogQuery.java Normal file
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package spark.examples;
import com.google.common.collect.Lists;
import scala.Tuple2;
import scala.Tuple3;
import spark.api.java.JavaPairRDD;
import spark.api.java.JavaRDD;
import spark.api.java.JavaSparkContext;
import spark.api.java.function.Function2;
import spark.api.java.function.PairFunction;
import java.io.Serializable;
import java.util.Collections;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Executes a roll up-style query against Apache logs.
*/
public class JavaLogQuery {
public static List<String> exampleApacheLogs = Lists.newArrayList(
"10.10.10.10 - \"FRED\" [18/Jan/2013:17:56:07 +1100] \"GET http://images.com/2013/Generic.jpg " +
"HTTP/1.1\" 304 315 \"http://referall.com/\" \"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; GTB7.4; .NET CLR 2.0.50727; " +
".NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 1.0.3705; .NET CLR 1.1.4322; .NET CLR " +
"3.5.30729; Release=ARP)\" \"UD-1\" - \"image/jpeg\" \"whatever\" 0.350 \"-\" - \"\" 265 923 934 \"\" " +
"62.24.11.25 images.com 1358492167 - Whatup",
"10.10.10.10 - \"FRED\" [18/Jan/2013:18:02:37 +1100] \"GET http://images.com/2013/Generic.jpg " +
"HTTP/1.1\" 304 306 \"http:/referall.com\" \"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; " +
"GTB7.4; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; .NET CLR " +
"3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 1.0.3705; .NET CLR 1.1.4322; .NET CLR " +
"3.5.30729; Release=ARP)\" \"UD-1\" - \"image/jpeg\" \"whatever\" 0.352 \"-\" - \"\" 256 977 988 \"\" " +
"0 73.23.2.15 images.com 1358492557 - Whatup");
public static Pattern apacheLogRegex = Pattern.compile("^([\\d.]+) (\\S+) (\\S+) \\[([\\w\\d:/]+\\s[+\\-]\\d{4})\\] \"(.+?)\" (\\d{3}) ([\\d\\-]+) \"([^\"]+)\" \"([^\"]+)\".*");
/** Tracks the total query count and number of aggregate bytes for a particular group. */
public static class Stats implements Serializable {
private int count;
private int numBytes;
public Stats(int count, int numBytes) {
this.count = count;
this.numBytes = numBytes;
}
public Stats merge(Stats other) {
return new Stats(count + other.count, numBytes + other.numBytes);
}
public String toString() {
return String.format("bytes=%s\tn=%s", numBytes, count);
}
}
public static Tuple3<String, String, String> extractKey(String line) {
Matcher m = apacheLogRegex.matcher(line);
List<String> key = Collections.emptyList();
if (m.find()) {
String ip = m.group(1);
String user = m.group(3);
String query = m.group(5);
if (!user.equalsIgnoreCase("-")) {
return new Tuple3<String, String, String>(ip, user, query);
}
}
return new Tuple3<String, String, String>(null, null, null);
}
public static Stats extractStats(String line) {
Matcher m = apacheLogRegex.matcher(line);
if (m.find()) {
int bytes = Integer.parseInt(m.group(7));
return new Stats(1, bytes);
}
else
return new Stats(1, 0);
}
public static void main(String[] args) throws Exception {
if (args.length == 0) {
System.err.println("Usage: JavaLogQuery <master> [logFile]");
System.exit(1);
}
JavaSparkContext jsc = new JavaSparkContext(args[0], "JavaLogQuery",
System.getenv("SPARK_HOME"), System.getenv("SPARK_EXAMPLES_JAR"));
JavaRDD<String> dataSet = (args.length == 2) ? jsc.textFile(args[1]) : jsc.parallelize(exampleApacheLogs);
JavaPairRDD<Tuple3<String, String, String>, Stats> extracted = dataSet.map(new PairFunction<String, Tuple3<String, String, String>, Stats>() {
@Override
public Tuple2<Tuple3<String, String, String>, Stats> call(String s) throws Exception {
return new Tuple2<Tuple3<String, String, String>, Stats>(extractKey(s), extractStats(s));
}
});
JavaPairRDD<Tuple3<String, String, String>, Stats> counts = extracted.reduceByKey(new Function2<Stats, Stats, Stats>() {
@Override
public Stats call(Stats stats, Stats stats2) throws Exception {
return stats.merge(stats2);
}
});
List<Tuple2<Tuple3<String, String, String>, Stats>> output = counts.collect();
for (Tuple2 t : output) {
System.out.println(t._1 + "\t" + t._2);
}
System.exit(0);
}
}

47
examples/src/main/java/spark/examples/JavaSparkPi.java Normal file
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package spark.examples;
import spark.api.java.JavaRDD;
import spark.api.java.JavaSparkContext;
import spark.api.java.function.Function;
import spark.api.java.function.Function2;
import java.util.ArrayList;
import java.util.List;
/** Computes an approximation to pi */
public class JavaSparkPi {
public static void main(String[] args) throws Exception {
if (args.length == 0) {
System.err.println("Usage: JavaLogQuery <master> [slices]");
System.exit(1);
}
JavaSparkContext jsc = new JavaSparkContext(args[0], "JavaLogQuery",
System.getenv("SPARK_HOME"), System.getenv("SPARK_EXAMPLES_JAR"));
int slices = (args.length == 2) ? Integer.parseInt(args[1]) : 2;
int n = 100000 * slices;
List<Integer> l = new ArrayList<Integer>(n);
for (int i = 0; i < n; i++)
l.add(i);
JavaRDD<Integer> dataSet = jsc.parallelize(l, slices);
int count = dataSet.map(new Function<Integer, Integer>() {
@Override
public Integer call(Integer integer) throws Exception {
double x = Math.random() * 2 - 1;
double y = Math.random() * 2 - 1;
return (x * x + y * y < 1) ? 1 : 0;
}
}).reduce(new Function2<Integer, Integer, Integer>() {
@Override
public Integer call(Integer integer, Integer integer2) throws Exception {
return integer + integer2;
}
});
System.out.println("Pi is roughly " + 4.0 * count / n);
}
}

1
examples/src/main/scala/spark/examples/SparkPi.scala
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@ -4,6 +4,7 @@ import scala.math.random
import spark._
import SparkContext._
/** Computes an approximation to pi */
object SparkPi {
def main(args: Array[String]) {
if (args.length == 0) {