Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Re-port RecoverableNetworkWordCount to Java example, and touch up doc…
… / formatting in related examples
- Loading branch information
Showing
3 changed files
with
165 additions
and
7 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
160 changes: 160 additions & 0 deletions
160
...es/src/main/java/org/apache/spark/examples/streaming/JavaRecoverableNetworkWordCount.java
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,160 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright ownership. | ||
| * The ASF licenses this file to You under the Apache License, Version 2.0 | ||
| * (the "License"); you may not use this file except in compliance with | ||
| * the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package org.apache.spark.examples.streaming; | ||
|
|
||
| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.nio.charset.Charset; | ||
| import java.util.Arrays; | ||
| import java.util.regex.Pattern; | ||
|
|
||
| import scala.Tuple2; | ||
| import com.google.common.collect.Lists; | ||
| import com.google.common.io.Files; | ||
|
|
||
| import org.apache.spark.SparkConf; | ||
| import org.apache.spark.api.java.JavaPairRDD; | ||
| import org.apache.spark.api.java.function.FlatMapFunction; | ||
| import org.apache.spark.api.java.function.Function2; | ||
| import org.apache.spark.api.java.function.PairFunction; | ||
| import org.apache.spark.streaming.Durations; | ||
| import org.apache.spark.streaming.Time; | ||
| import org.apache.spark.streaming.api.java.JavaDStream; | ||
| import org.apache.spark.streaming.api.java.JavaPairDStream; | ||
| import org.apache.spark.streaming.api.java.JavaReceiverInputDStream; | ||
| import org.apache.spark.streaming.api.java.JavaStreamingContext; | ||
| import org.apache.spark.streaming.api.java.JavaStreamingContextFactory; | ||
|
|
||
| /** | ||
| * Counts words in text encoded with UTF8 received from the network every second. | ||
| * | ||
| * Usage: JavaRecoverableNetworkWordCount <hostname> <port> <checkpoint-directory> <output-file> | ||
| * <hostname> and <port> describe the TCP server that Spark Streaming would connect to receive | ||
| * data. <checkpoint-directory> directory to HDFS-compatible file system which checkpoint data | ||
| * <output-file> file to which the word counts will be appended | ||
| * | ||
| * <checkpoint-directory> and <output-file> must be absolute paths | ||
| * | ||
| * To run this on your local machine, you need to first run a Netcat server | ||
| * | ||
| * `$ nc -lk 9999` | ||
| * | ||
| * and run the example as | ||
| * | ||
| * `$ ./bin/run-example org.apache.spark.examples.streaming.JavaRecoverableNetworkWordCount \ | ||
| * localhost 9999 ~/checkpoint/ ~/out` | ||
| * | ||
| * If the directory ~/checkpoint/ does not exist (e.g. running for the first time), it will create | ||
| * a new StreamingContext (will print "Creating new context" to the console). Otherwise, if | ||
| * checkpoint data exists in ~/checkpoint/, then it will create StreamingContext from | ||
| * the checkpoint data. | ||
| * | ||
| * To run this example in a local standalone cluster with automatic driver recovery, | ||
| * | ||
| * `$ bin/spark-class org.apache.spark.deploy.Client -s launch <cluster-url> \ | ||
| * <path-to-examples-jar> \ | ||
| * org.apache.spark.examples.streaming.JavaRecoverableNetworkWordCount <cluster-url> \ | ||
| * localhost 9999 ~/checkpoint ~/out` | ||
| * | ||
| * <path-to-examples-jar> would typically be | ||
| * <spark-dir>/examples/target/scala-XX/spark-examples....jar | ||
| * | ||
| * Refer to the online documentation for more details. | ||
| */ | ||
| public final class JavaRecoverableNetworkWordCount { | ||
| private static final Pattern SPACE = Pattern.compile(" "); | ||
|
|
||
| private static JavaStreamingContext createContext(String ip, int port, String outputPath) { | ||
|
|
||
| // If you do not see this printed, that means the StreamingContext has been loaded | ||
| // from the new checkpoint | ||
| System.out.println("Creating new context"); | ||
| final File outputFile = new File(outputPath); | ||
| if (outputFile.exists()) { | ||
| outputFile.delete(); | ||
| } | ||
| SparkConf sparkConf = new SparkConf().setAppName("JavaRecoverableNetworkWordCount"); | ||
| // Create the context with a 1 second batch size | ||
| JavaStreamingContext ssc = new JavaStreamingContext(sparkConf, Durations.seconds(1)); | ||
|
|
||
| // Create a socket stream on target ip:port and count the | ||
| // words in input stream of \n delimited text (eg. generated by 'nc') | ||
| JavaReceiverInputDStream<String> lines = ssc.socketTextStream(ip, port); | ||
| JavaDStream<String> words = lines.flatMap(new FlatMapFunction<String, String>() { | ||
| @Override | ||
| public Iterable<String> call(String x) { | ||
| return Lists.newArrayList(SPACE.split(x)); | ||
| } | ||
| }); | ||
| JavaPairDStream<String, Integer> wordCounts = words.mapToPair( | ||
| new PairFunction<String, String, Integer>() { | ||
| @Override | ||
| public Tuple2<String, Integer> call(String s) { | ||
| return new Tuple2<String, Integer>(s, 1); | ||
| } | ||
| }).reduceByKey(new Function2<Integer, Integer, Integer>() { | ||
| @Override | ||
| public Integer call(Integer i1, Integer i2) { | ||
| return i1 + i2; | ||
| } | ||
| }); | ||
|
|
||
| wordCounts.foreachRDD(new Function2<JavaPairRDD<String, Integer>, Time, Void>() { | ||
| @Override | ||
| public Void call(JavaPairRDD<String, Integer> rdd, Time time) throws IOException { | ||
| String counts = "Counts at time " + time + " " + rdd.collect(); | ||
| System.out.println(counts); | ||
| System.out.println("Appending to " + outputFile.getAbsolutePath()); | ||
| Files.append(counts + "\n", outputFile, Charset.defaultCharset()); | ||
| return null; | ||
| } | ||
| }); | ||
|
|
||
| return ssc; | ||
| } | ||
|
|
||
| public static void main(String[] args) { | ||
| if (args.length != 4) { | ||
| System.err.println("You arguments were " + Arrays.asList(args)); | ||
| System.err.println( | ||
| "Usage: JavaRecoverableNetworkWordCount <hostname> <port> <checkpoint-directory>\n" + | ||
| " <output-file>. <hostname> and <port> describe the TCP server that Spark\n" + | ||
| " Streaming would connect to receive data. <checkpoint-directory> directory to\n" + | ||
| " HDFS-compatible file system which checkpoint data <output-file> file to which\n" + | ||
| " the word counts will be appended\n" + | ||
| "\n" + | ||
| "In local mode, <master> should be 'local[n]' with n > 1\n" + | ||
| "Both <checkpoint-directory> and <output-file> must be absolute paths"); | ||
| System.exit(1); | ||
| } | ||
|
|
||
| final String ip = args[0]; | ||
| final int port = Integer.parseInt(args[1]); | ||
| String checkpointDirectory = args[2]; | ||
| final String outputPath = args[3]; | ||
| JavaStreamingContextFactory factory = new JavaStreamingContextFactory() { | ||
| @Override | ||
| public JavaStreamingContext create() { | ||
| return createContext(ip, port, outputPath); | ||
| } | ||
| }; | ||
| JavaStreamingContext ssc = JavaStreamingContext.getOrCreate(checkpointDirectory, factory); | ||
| ssc.start(); | ||
| ssc.awaitTermination(); | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters