Question

如何在eclipse调试storm程序

Answer 1

一、介绍
storm提供了两种运行模式：本地模式和分布式模式。本地模式针对开发调试storm topologies非常有用。
Storm has two modes of operation: local mode and distributed mode. In local mode, Storm executes completely in process by simulating worker nodes with threads. Local mode is useful for testing and development of topologies
因为多数程序开发者都是使用windows系统进行程序开发，如果在本机不安装storm环境的情况下，开发、调试storm程序。如果你正在为此问题而烦恼，请使用本文提供的方法。
二、实施步骤
如何基于eclipse+maven调试storm程序，步骤如下：
1.搭建好开发环境（eclipse+maven,本人使用的是eclipse Kepler 与maven3.1.1）
2.创建maven项目，并修改pom.xml，内容如pom.xml（机器联网，下载所需的依赖jar）
Github上的pom.xml,引入的依赖太多，有些不需要，详细可以参考：
http://go.rritw.com/github.com/nathanmarz/storm-starter/blob/master/m2-pom.xml
3. 编写storm程序，指定为本地模式运行。本文提供的程序是wordcount
重要的是LocalCluster cluster = new LocalCluster();这一句
Config conf = new Config();
conf.setDebug(true);
conf.setNumWorkers(2);

LocalCluster cluster = new LocalCluster();
cluster.submitTopology("test", conf, builder.createTopology());
Utils.sleep(10000);
cluster.killTopology("test");
cluster.shutdown();

pom.xml文件

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>storm.starter</groupId>
<artifactId>storm-starter</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

<repositories>
<repository>
<id>github-releases</id>
<url>http://oss.sonatype.org/content/repositories/github-releases/</url>
</repository>
<repository>
<id>clojars.org</id>
<url>http://clojars.org/repo</url>
</repository>
</repositories>

<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>storm</groupId>
<artifactId>storm</artifactId>
<version>0.9.0.1</version>
<!-- keep storm out of the jar-with-dependencies -->
<scope>provided</scope>
</dependency>
<dependency>
<groupId>commons-collections</groupId>
<artifactId>commons-collections</artifactId>
<version>3.2.1</version>
</dependency>
</dependencies>
</project>

storm程序
package storm.starter;

import java.util.HashMap;
import java.util.Map;

import storm.starter.spout.RandomSentenceSpout;
import backtype.storm.Config;
import backtype.storm.LocalCluster;
import backtype.storm.StormSubmitter;
import backtype.storm.topology.BasicOutputCollector;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.TopologyBuilder;
import backtype.storm.topology.base.BaseBasicBolt;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;

/**
* This topology demonstrates Storm's stream groupings and multilang
* capabilities.
*/
public class WordCountTopology {
public static class SplitSentence extends BaseBasicBolt {
@Override
public void execute(Tuple input, BasicOutputCollector collector) {
try {
String msg = input.getString(0);
System.out.println(msg + "-------------------");
if (msg != null) {
String[] s = msg.split(" ");
for (String string : s) {
collector.emit(new Values(string));
}
}
} catch (Exception e) {
e.printStackTrace();
}
}

@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("word"));
}
}

public static class WordCount extends BaseBasicBolt {
Map<String, Integer> counts = new HashMap<String, Integer>();

@Override
public void execute(Tuple tuple, BasicOutputCollector collector) {
String word = tuple.getString(0);
Integer count = counts.get(word);
if (count == null)
count = 0;
count++;
counts.put(word, count);
collector.emit(new Values(word, count));
}

@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("word", "count"));
}
}

public static void main(String[] args) throws Exception {

TopologyBuilder builder = new TopologyBuilder();

builder.setSpout("spout", new RandomSentenceSpout(), 5);

builder.setBolt("split", new SplitSentence(), 8).shuffleGrouping(
"spout");
builder.setBolt("count", new WordCount(), 12).fieldsGrouping("split",
new Fields("word"));

Config conf = new Config();
conf.setDebug(true);

if (args != null && args.length > 0) {
conf.setNumWorkers(3);

StormSubmitter.submitTopology(args[0], conf,
builder.createTopology());
} else {
conf.setMaxTaskParallelism(3);

LocalCluster cluster = new LocalCluster();
cluster.submitTopology("word-count", conf, builder.createTopology());

Thread.sleep(10000);

cluster.shutdown();
}
}
}
package storm.starter.spout;

import backtype.storm.spout.SpoutOutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.base.BaseRichSpout;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Values;
import backtype.storm.utils.Utils;

import java.util.Map;
import java.util.Random;

public class RandomSentenceSpout extends BaseRichSpout {
SpoutOutputCollector _collector;
Random _rand;

@Override
public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
_collector = collector;
_rand = new Random();
}

@Override
public void nextTuple() {
Utils.sleep(100);
String[] sentences = new String[]{ "the cow jumped over the moon", "an apple a day keeps the doctor away",
"four score and seven years ago", "snow white and the seven dwarfs", "i am at two with nature" };
String sentence = sentences[_rand.nextInt(sentences.length)];
_collector.emit(new Values(sentence));
}

@Override
public void ack(Object id) {
}

@Override
public void fail(Object id) {
}

@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("word"));
}

}