今天作者要在这里通过一个简单的电商网站订单实时分析系统和大家一起梳理一下大数据环境下的实时分析系统的架构模型。当然这个架构模型只是实时分析技术的一 个简单的入门级架构，实际生产环境中的大数据实时分析技术还涉及到很多细节的处理, 比如使用Storm的ACK机制保证数据都能被正确处理, 集群的高可用架构, 消费数据时如何处理重复数据或者丢失数据等问题，根据不同的业务场景，对数据的可靠性要求以及系统的复杂度的要求也会不同。这篇文章的目的只是带大家入个门，让大家对实时分析技术有一个简单的认识，并和大家一起做学习交流。
文章的最后还有Troubleshooting，分享了作者在部署本文示例程序过程中所遇到的各种问题和解决方案。

系统基本架构



整个实时分析系统的架构就是先由电商系统的订单服务器产生订单日志, 然后使用Flume去监听订单日志，并实时把每一条日志信息抓取下来并存进Kafka消息系统中, 接着由Storm系统消费Kafka中的消息，同时消费记录由Zookeeper集群管理，这样即使Kafka宕机重启后也能找到上次的消费记录，接着从上次宕机点继续从Kafka的Broker中进行消费。但是由于存在先消费后记录日志或者先记录后消费的非原子操作，如果出现刚好消费完一条消息并还没将信息记录到Zookeeper的时候就宕机的类似问题，或多或少都会存在少量数据丢失或重复消费的问题, 其中一个解决方案就是Kafka的Broker和Zookeeper都部署在同一台机子上。接下来就是使用用户定义好的Storm Topology去进行日志信息的分析并输出到Redis缓存数据库中(也可以进行持久化)，最后用Web APP去读取Redis中分析后的订单信息并展示给用户。之所以在Flume和Storm中间加入一层Kafka消息系统，就是因为在高并发的条件下, 订单日志的数据会井喷式增长，如果Storm的消费速度(Storm的实时计算能力那是最快之一,但是也有例外, 而且据说现在Twitter的开源实时计算框架Heron比Storm还要快)慢于日志的产生速度，加上Flume自身的局限性，必然会导致大量数据滞后并丢失，所以加了Kafka消息系统作为数据缓冲区，而且Kafka是基于log File的消息系统，也就是说消息能够持久化在硬盘中，再加上其充分利用Linux的I/O特性,提供了可观的吞吐量。架构中使用Redis作为数据库也是因为在实时的环境下，Redis具有很高的读写速度。

业务背景
各大电商网站在合适的时间进行各种促销活动已是常态，在能为网站带来大量的流量和订单的同时，对于用户也有不小的让利，必然是大家伙儿喜闻乐见的。在促销活动期间，老板和运营希望能实时看到订单情况，老板开心，运营也能根据实时的订单数据调整运营策略，而让用户能实时看到网站的订单数据，也会勾起用户的购买欲。但是普通的离线计算系统已然不能满足在高并发环境下的实时计算要求，所以我们得使用专门实时计算系统,如:Storm, Heron, Spark Stream等,去满足类似的需求。
既然要分析订单数据，那必然在订单产生的时候要把订单信息记录在日志文件中。本文中，作者通过使用log4j2，以及结合自己之前开发电商系统的经验，写了一个订单日志生成模拟器，代码如下，能帮助大家随机产生订单日志。下面所展示的订单日志文件格式和数据就是我们本文中的分析目标，本文的案例中用来分析所有商家的订单总销售额并找出销售额钱20名的商家。

订单数据格式：
orderNumber: XX | orderDate: XX | paymentNumber: XX | paymentDate: XX | merchantName: XX | sku: [ skuName: XX skuNum: XX skuCode: XX skuPrice: XX totalSkuPrice: XX;skuName: XX skuNum: XX skuCode: XX skuPrice: XX totalSkuPrice: XX;] | price: [ totalPrice: XX discount: XX paymentPrice: XX ]



订单日志生成程序：
使用log4j2将日志信息写入文件中，每小时滚动一次日志文件

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="INFO">
      <Appenders>
        <Console name="myConsole" target="SYSTEM_OUT">
          <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss} [%t] %-5level %logger{36} - %msg%n"/>
        </Console>
    	<RollingFile name="myFile" fileName="/Users/guludada/Desktop/logs/app.log"
          filePattern="/Users/guludada/Desktop/logs/app-%d{yyyy-MM-dd-HH}.log">
        	<PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss} [%t] %-5level %logger{36} - %msg%n"/>
       		<Policies>
        		<TimeBasedTriggeringPolicy />
      		</Policies>
        </RollingFile>          		
      </Appenders>
      <Loggers>
        <Root level="Info">
          <AppenderRef ref="myConsole"/>
          <AppenderRef ref="myFile"/>
        </Root>
      </Loggers>
</Configuration>

package com.guludada.ordersInfo;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

// Import log4j classes.
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;



public class ordersInfoGenerator {
	
	public enum paymentWays {
		Wechat,Alipay,Paypal
	}
	public enum merchantNames {
		优衣库,天猫,淘宝,咕噜大大,快乐宝贝,守望先峰,哈毒妇,Storm,Oracle,Java,CSDN,跑男,路易斯威登,
		暴雪公司,Apple,Sumsam,Nissan,Benz,BMW,Maserati
	}
	
	public enum productNames {
		黑色连衣裙, 灰色连衣裙, 棕色衬衫, 性感牛仔裤, 圆脚牛仔裤,塑身牛仔裤, 朋克卫衣,高腰阔腿休闲裤,人字拖鞋,
		沙滩拖鞋
	}
	
	float[] skuPriceGroup = {299,399,699,899,1000,2000};
	float[] discountGroup = {10,20,50,100};
	float totalPrice = 0;
	float discount = 0;
	float paymentPrice = 0;
	
	private static final Logger logger = LogManager.getLogger(ordersInfoGenerator.class);
	private int logsNumber = 1000;
	
	public void generate() {
				
		for(int i = 0; i <= logsNumber; i++) {			
			logger.info(randomOrderInfo());			
		}
	}
	
	public String randomOrderInfo() {
		
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");		
		Date date = new Date();		
		
		String orderNumber = randomNumbers(5) + date.getTime();
		
		String orderDate = sdf.format(date);
		
		String paymentNumber = randomPaymentWays() + "-" + randomNumbers(8);
		
		String paymentDate = sdf.format(date);
		
		String merchantName = randomMerchantNames();
		
		String skuInfo = randomSkus();
		
		String priceInfo = calculateOrderPrice();
		
		return "orderNumber: " + orderNumber + " | orderDate: " + orderDate + " | paymentNumber: " +
			paymentNumber + " | paymentDate: " + paymentDate + " | merchantName: " + merchantName + 
			" | sku: " + skuInfo + " | price: " + priceInfo;
	}
		
	private String randomPaymentWays() {
		
		paymentWays[] paymentWayGroup = paymentWays.values();
		Random random = new Random();
		return paymentWayGroup[random.nextInt(paymentWayGroup.length)].name();
	}
	
	private String randomMerchantNames() {
		
		merchantNames[] merchantNameGroup = merchantNames.values();
		Random random = new Random();
		return merchantNameGroup[random.nextInt(merchantNameGroup.length)].name();
	}
	
	private String randomProductNames() {
		
		productNames[] productNameGroup = productNames.values();
		Random random = new Random();
		return productNameGroup[random.nextInt(productNameGroup.length)].name();
	}
	
	
	private String randomSkus() {
		
		Random random = new Random();
		int skuCategoryNum = random.nextInt(3);
		
		String skuInfo ="[";
		
		totalPrice = 0;
		for(int i = 1; i <= 3; i++) {
			
			int skuNum = random.nextInt(3)+1;
			float skuPrice = skuPriceGroup[random.nextInt(skuPriceGroup.length)];
			float totalSkuPrice = skuPrice * skuNum;			
			String skuName = randomProductNames();
			String skuCode = randomCharactersAndNumbers(10);
			skuInfo += " skuName: " + skuName + " skuNum: " + skuNum + " skuCode: " + skuCode
					+ " skuPrice: " + skuPrice + " totalSkuPrice: " + totalSkuPrice + ";";		
			totalPrice += totalSkuPrice;
		}
		
		
		skuInfo += " ]";
		
		return skuInfo;
	}
	
	private String calculateOrderPrice() {
		
		Random random = new Random();
		discount = discountGroup[random.nextInt(discountGroup.length)];
		paymentPrice = totalPrice - discount;
		
		String priceInfo = "[ totalPrice: " + totalPrice + " discount: " + discount + " paymentPrice: " + paymentPrice +" ]";
		
		return priceInfo;
	}
	
	private String randomCharactersAndNumbers(int length) {
		
		String characters = "abcdefghijklmnopqrstuvwxyz0123456789";
		String randomCharacters = "";  
                Random random = new Random();  
                for (int i = 0; i < length; i++) {  
        	  randomCharacters += characters.charAt(random.nextInt(characters.length()));  
                }  
                return randomCharacters;  
	}
	
	private String randomNumbers(int length) {
		
		String characters = "0123456789";
		String randomNumbers = "";   
                Random random = new Random();  
                for (int i = 0; i < length; i++) {  
        	 randomNumbers += characters.charAt(random.nextInt(characters.length()));  
                }  
               return randomNumbers;		
	}
	
	public static void main(String[] args) {
		
		ordersInfoGenerator generator = new ordersInfoGenerator();
		generator.generate();
	}
}

在本文中，Flume的Source我们选择的是Exec Source，因为是实时系统，直接通过tail 命令来监听日志文件，而在Kafka的Broker集群端的Flume我们选择Kafka Sink 来把数据下沉到Kafka消息系统中。

下图是来自Flume官网里的Flume拉取数据的架构图：

    图片来源：http://flume.apache.org/FlumeUserGuide.html

订单日志产生端的Flume配置文件如下：

agent.sources = origin
agent.channels = memorychannel
agent.sinks = target

agent.sources.origin.type = exec
agent.sources.origin.command = tail -F /export/data/trivial/app.log
agent.sources.origin.channels = memorychannel

agent.sources.origin.interceptors = i1
agent.sources.origin.interceptors.i1.type = static
agent.sources.origin.interceptors.i1.key = topic
agent.sources.origin.interceptors.i1.value = ordersInfo

agent.sinks.loggerSink.type = logger
agent.sinks.loggerSink.channel = memorychannel

agent.channels.memorychannel.type = memory
agent.channels.memorychannel.capacity = 10000

agent.sinks.target.type = avro
agent.sinks.target.channel = memorychannel
agent.sinks.target.hostname = 172.16.124.130
agent.sinks.target.port = 4545

agent.sources = origin
agent.channels = memorychannel
agent.sinks = target

agent.sources.origin.type = avro
agent.sources.origin.channels = memorychannel
agent.sources.origin.bind = 0.0.0.0
agent.sources.origin.port = 4545

agent.sinks.loggerSink.type = logger
agent.sinks.loggerSink.channel = memorychannel

agent.channels.memorychannel.type = memory
agent.channels.memorychannel.capacity = 5000000
agent.channels.memorychannel.transactionCapacity = 1000000

agent.sinks.target.type = org.apache.flume.sink.kafka.KafkaSink
#agent.sinks.target.topic = bigdata
agent.sinks.target.brokerList=localhost:9092
agent.sinks.target.requiredAcks=1
agent.sinks.target.batchSize=100
agent.sinks.target.channel = memorychannel

config/server-1.properties:
    broker.id=1
    listeners=PLAINTEXT://:9093
    log.dir=export/data/kafka
    zookeeper.connect=localhost:2181

config/server-2.properties:
    broker.id=2
    listeners=PLAINTEXT://:9093
    log.dir=/export/data/kafka
    zookeeper.connect=localhost:2181

> bin/kafka-server-start.sh config/server-1.properties &
...
> bin/kafka-server-start.sh config/server-2.properties &
...

# 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.

########### These MUST be filled in for a storm configuration
storm.zookeeper.servers:
  - "ymhHadoop"
  - "ymhHadoop2"
  - "ymhHadoop3"    

storm.local.dir: "/export/data/storm/workdir"
 
nimbus.host: "ymhHadoop"

supervisor.slots.ports:
  -6700
  -6701
  -6702
  -6703 
 

package com.guludada.ordersanalysis;

import java.util.UUID;

import backtype.storm.Config;
import backtype.storm.LocalCluster;
import backtype.storm.StormSubmitter;
import backtype.storm.generated.AlreadyAliveException;
import backtype.storm.generated.InvalidTopologyException;
import backtype.storm.spout.SchemeAsMultiScheme;
import backtype.storm.topology.TopologyBuilder;
import backtype.storm.tuple.Fields;
import storm.kafka.Broker;
import storm.kafka.BrokerHosts;
import storm.kafka.KafkaSpout;
import storm.kafka.SpoutConfig;
import storm.kafka.StaticHosts;
import storm.kafka.StringScheme;
import storm.kafka.ZkHosts;
import storm.kafka.trident.GlobalPartitionInformation;

public class ordersAnalysisTopology {
	
	private static String topicName = "ordersInfo";
	private static String zkRoot = "/stormKafka/"+topicName;
	
	public static void main(String[] args) {
		
		BrokerHosts hosts = new ZkHosts("ymhHadoop:2181,ymhHadoop2:2181,ymhHadoop3:2181");

		
		SpoutConfig spoutConfig = new SpoutConfig(hosts,topicName,zkRoot,UUID.randomUUID().toString());
		spoutConfig.scheme = new SchemeAsMultiScheme(new StringScheme());
		KafkaSpout kafkaSpout = new KafkaSpout(spoutConfig);
		
		TopologyBuilder builder = new TopologyBuilder();        
		builder.setSpout("kafkaSpout",kafkaSpout);        
		builder.setBolt("merchantsSalesBolt", new merchantsSalesAnalysisBolt(), 2).shuffleGrouping("kafkaSpout");

		Config conf = new Config();
		conf.setDebug(true);
		
		if(args != null && args.length > 0) {
			conf.setNumWorkers(1);
			try {
				StormSubmitter.submitTopologyWithProgressBar(args[0], conf, builder.createTopology());
			} catch (AlreadyAliveException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (InvalidTopologyException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
		} else {
			
			conf.setMaxSpoutPending(3);
			
			LocalCluster cluster = new LocalCluster();
			cluster.submitTopology("ordersAnalysis", conf, builder.createTopology());
			
			
		}

	}
}

package com.guludada.domain;

import java.util.ArrayList;
import java.util.Date;

public class ordersBean {

	Date createTime = null;
	String number = "";
	String paymentNumber = "";
	Date paymentDate = null;
	String merchantName = "";
	ArrayList<skusBean> skuGroup = null;
	float totalPrice = 0;
	float discount = 0;
	float paymentPrice = 0;
	
	public Date getCreateTime() {
		return createTime;
	}
	public void setCreateTime(Date createTime) {
		this.createTime = createTime;
	}
	public String getNumber() {
		return number;
	}
	public void setNumber(String number) {
		this.number = number;
	}
	public String getPaymentNumber() {
		return paymentNumber;
	}
	public void setPaymentNumber(String paymentNumber) {
		this.paymentNumber = paymentNumber;
	}
	public Date getPaymentDate() {
		return paymentDate;
	}
	public void setPaymentDate(Date paymentDate) {
		this.paymentDate = paymentDate;
	}
	public String getMerchantName() {
		return merchantName;
	}
	public void setMerchantName(String merchantName) {
		this.merchantName = merchantName;
	}
	public ArrayList<skusBean> getSkuGroup() {
		return skuGroup;
	}
	public void setSkuGroup(ArrayList<skusBean> skuGroup) {
		this.skuGroup = skuGroup;
	}
	public float getTotalPrice() {
		return totalPrice;
	}
	public void setTotalPrice(float totalPrice) {
		this.totalPrice = totalPrice;
	}
	public float getDiscount() {
		return discount;
	}
	public void setDiscount(float discount) {
		this.discount = discount;
	}
	public float getPaymentPrice() {
		return paymentPrice;
	}
	public void setPaymentPrice(float paymentPrice) {
		this.paymentPrice = paymentPrice;
	}
	
	
}

sbean，所以这里作者就没有写偷懒一下下

package com.guludada.domain;

public class skusBean {
      ………………
}

package com.guludada.common;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.guludada.domain.ordersBean;

public class logInfoHandler {
	
	SimpleDateFormat sdf_final = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
	
	public ordersBean getOrdersBean(String orderInfo) {
		
		ordersBean order = new ordersBean();
		
		//从日志信息中过滤出订单信息
		Pattern orderPattern = Pattern.compile("orderNumber:.+");
		Matcher orderMatcher = orderPattern.matcher(orderInfo);
		if(orderMatcher.find()) {
			
			String orderInfoStr = orderMatcher.group(0);
			String[] orderInfoGroup = orderInfoStr.trim().split("\\|");
			
			//获取订单号
			String orderNum = (orderInfoGroup[0].split(":"))[1].trim();
			order.setNumber(orderNum);
						
			//获取创建时间
			String orderCreateTime = orderInfoGroup[1].trim().split(" ")[1] + " " + orderInfoGroup[1].trim().split(" ")[2];
			try {
				order.setCreateTime(sdf_final.parse(orderCreateTime));
			} catch (ParseException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
			//获取商家名称
			String merchantName = (orderInfoGroup[4].split(":"))[1].trim();
			order.setMerchantName(merchantName);
			
			//获取订单总额
			String orderPriceInfo = (orderInfoGroup[6].split("price:"))[1].trim();
			String totalPrice = (orderPriceInfo.substring(2, orderPriceInfo.length()-3).trim().split(" "))[1];
			order.setTotalPrice(Float.parseFloat(totalPrice));
						
			return order;
						
		} else {
			return order;
		}
	}
}

package com.guludada.ordersanalysis;

import java.util.Map;

import com.guludada.common.logInfoHandler;
import com.guludada.domain.ordersBean;

import backtype.storm.task.OutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.base.BaseRichBolt;
import backtype.storm.tuple.Tuple;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

public class merchantsSalesAnalysisBolt extends BaseRichBolt {
	
	private OutputCollector _collector;
	logInfoHandler loginfohandler;
	JedisPool pool;

	public void execute(Tuple tuple) {
		String orderInfo = tuple.getString(0);
		ordersBean order = loginfohandler.getOrdersBean(orderInfo);
		
		//store the salesByMerchant infomation into Redis
		Jedis jedis = pool.getResource();
		jedis.zincrby("orderAna:topSalesByMerchant", order.getTotalPrice(), order.getMerchantName());
	}

	public void prepare(Map arg0, TopologyContext arg1, OutputCollector collector) {
		this._collector = collector;
		this.loginfohandler = new logInfoHandler();
		this.pool = new JedisPool(new JedisPoolConfig(), "ymhHadoop",6379,2 * 60000,"12345");
		
	}

	public void declareOutputFields(OutputFieldsDeclarer arg0) {
		// TODO Auto-generated method stub
		
	}

}

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.guludada</groupId>
  <artifactId>Storm_OrdersAnalysis</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>Storm_OrdersAnalysis Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
		<groupId>org.apache.storm</groupId>
		<artifactId>storm-core</artifactId>
		<version>0.9.6</version>
		<scope>provided</scope>
	</dependency>
	<dependency>
        <groupId>org.apache.storm</groupId>
        <artifactId>storm-kafka</artifactId>
        <version>0.9.6</version>
    </dependency>
    <dependency>
    	<groupId>org.apache.kafka</groupId>
        <artifactId>kafka_2.10</artifactId>
        <version>0.9.0.1</version>
            <exclusions>
                <exclusion>
                    <groupId>org.apache.zookeeper</groupId>
                    <artifactId>zookeeper</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>log4j</groupId>
                    <artifactId>log4j</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.slf4j</groupId>
    				<artifactId>slf4j-log4j12</artifactId>
                </exclusion>
            </exclusions>
    </dependency>
    <dependency>
	    <groupId>redis.clients</groupId>
	    <artifactId>jedis</artifactId>
	    <version>2.8.1</version>
	</dependency>	
  </dependencies>
  <build>
    <finalName>Storm_OrdersAnalysis</finalName>
    <plugins>
		<plugin>
			<artifactId>maven-assembly-plugin</artifactId>
			<configuration>
				<descriptorRefs>  
			    	<descriptorRef>jar-with-dependencies</descriptorRef>
			    </descriptorRefs>
			    <archive>
			       <manifest>
			         <mainClass>com.guludada.ordersanalysis.ordersAnalysisTopology</mainClass>
			       </manifest>
			     </archive>
			 </configuration>
		  </plugin>
	  </plugins>
  </build>
</project>

如下图:

1. 在使用maven同时导入storm-core, storm-kaka和kafka的依赖包的时候可能会出现jar包冲突导致无法初始化Log4jLoggerFactory，并无法启动Storm程序.解决方法也很简单，按照红字提示，把多余的jar包移除就行了，通过在maven的pom文件中kafka的依赖设置部分加入下面的设置<exclusion><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId></exclusion>
2. 第一次执行Storm建立Topology时，作者遇到了一个十分低级的问题，就是发现明明Kafka的topic里有数据，可是Storm程序怎么都无法读取到数据，后来才从下面的文章中明白了问题的所在 http://m.blog.csdn.net/article/details?id=18615761  原因就在于Topology第一次启动前还没有在zookeeper中的zkRoot创建offset信息，Storm取不到offset信息就会使用默认的offset，也就是log文件中从最后一个元素开始读取信息，所以之前在kafka中的数据都无法读出来。Storm启动后，再往broker中写数据，这些后写的数据就能正确被Storm处理。                                  
3. 当Storm的topology传到Nimbus的时候，或者说你的Storm程序刚开始启动的时候可能会报关于JedisPool是一个无法序列化的对象而导致的错误：java.lang.RuntimeException:java.io.NotSerializableException: redis.clients.jedis.JedisPool 解决方案就是将Bolt类中外部的JedisPool初始化代码放入Bolt的prepare()方法中，如本文的代码示例所示
4. 在Storm启动并开始连接Redis的时候，会报出连接被拒绝，因为Redis运行在protect mode模式下的错误。这是因为Storm程序是远程连接Redis的服务器端，如果Redis服务器端没有设置密码的话是拒绝远程连接的。解决方法也十分简单，关闭protect mode模式(强烈不推荐),或者使用下面命令为Redis设置密码就可以了$config set requirepass 123
5. 向Storm提交Topology以后, Supervisor端会一直报“Kill XXXX No Such process”的错误，多数原因是提交的topology没有正确被执行，而Storm的日记中不会显示topology程序里的错误。解决方法就是启动Storm UI, 通过这个Storm自带的UI界面查看topology的运行情况，并且程序中的错误也会在UI界面中显示出来，能方便地查看topology程序的错误。