這篇文章將為大家詳細(xì)講解有關(guān)Spark中Spark Streaming怎么用,小編覺得挺實(shí)用的,因此分享給大家做個(gè)參考,希望大家閱讀完這篇文章后可以有所收獲。
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1. Spark Streaming
Spark Streaming是一個(gè)基于Spark Core之上的實(shí)時(shí)計(jì)算框架,可以從很多數(shù)據(jù)源消費(fèi)數(shù)據(jù)并對(duì)數(shù)據(jù)進(jìn)行處理
Spark Streaing中有一個(gè)最基本的抽象叫DStream(代理),本質(zhì)上就是一系列連續(xù)的RDD,DStream其實(shí)就是對(duì)RDD的封裝
DStream可以認(rèn)為是一個(gè)RDD的工廠,該DStream里面生產(chǎn)都是相同業(yè)務(wù)邏輯的RDD,只不過是RDD里面要讀取數(shù)據(jù)的不相同
在一個(gè)批次的處理時(shí)間間隔里, DStream只產(chǎn)生一個(gè)RDD
DStream就相當(dāng)于一個(gè)"模板", 我們可以根據(jù)這個(gè)"模板"來處理一段時(shí)間間隔之內(nèi)產(chǎn)生的這個(gè)rdd,以此為依據(jù)來構(gòu)建rdd的DAG
2. 當(dāng)下比較流行的實(shí)時(shí)計(jì)算引擎
吞吐量 編程語言 處理速度 生態(tài)
Storm 較低 clojure 非???亞秒) 阿里(JStorm)
Flink 較高 scala 較快(亞秒) 國(guó)內(nèi)使用較少
Spark Streaming 非常高 scala 快(毫秒) 完善的生態(tài)圈
3. Spark Streaming處理網(wǎng)絡(luò)數(shù)據(jù)
//創(chuàng)建StreamingContext 至少要有兩個(gè)線程 一個(gè)線程用于接收數(shù)據(jù) 一個(gè)線程用于處理數(shù)據(jù) val conf = new SparkConf().setAppName("Ops1").setMaster("local[2]") val ssc = new StreamingContext(conf, Milliseconds(3000)) val receiverDS: ReceiverInputDStream[String] = ssc.socketTextStream("uplooking01", 44444) val pairRetDS: DStream[(String, Int)] = receiverDS.flatMap(_.split(",")).map((_, 1)).reduceByKey(_ + _) pairRetDS.print() //開啟流計(jì)算 ssc.start() //優(yōu)雅的關(guān)閉 ssc.awaitTermination()
4. Spark Streaming接收數(shù)據(jù)的兩種方式(Kafka)
Receiver
偏移量是由zookeeper來維護(hù)的
使用的是Kafka高級(jí)的API(消費(fèi)者的API)
編程簡(jiǎn)單
效率低(為了保證數(shù)據(jù)的安全性,會(huì)開啟WAL)
kafka0.10的版本中已經(jīng)徹底棄用Receiver了
生產(chǎn)環(huán)境一般不會(huì)使用這種方式
Direct
偏移量是有我們來手動(dòng)維護(hù)
效率高(我們直接把spark streaming接入到kafka的分區(qū)中了)
編程比較復(fù)雜
生產(chǎn)環(huán)境一般使用這種方式
5. Spark Streaming整合Kafka
基于Receiver的方式整合kafka(生產(chǎn)環(huán)境不建議使用,在0.10中已經(jīng)移除了)
//創(chuàng)建StreamingContext 至少要有兩個(gè)線程 一個(gè)線程用于接收數(shù)據(jù) 一個(gè)線程用于處理數(shù)據(jù) val conf = new SparkConf().setAppName("Ops1").setMaster("local[2]") val ssc = new StreamingContext(conf, Milliseconds(3000)) val zkQuorum = "uplooking03:2181,uplooking04:2181,uplooking05:2181" val groupId = "myid" val topics = Map("hadoop" -> 3) val receiverDS: ReceiverInputDStream[(String, String)] = KafkaUtils.createStream(ssc, zkQuorum, groupId, topics) receiverDS.flatMap(_._2.split(" ")).map((_,1)).reduceByKey(_+_).print() ssc.start() ssc.awaitTermination()
基于Direct的方式(生產(chǎn)環(huán)境使用)
//創(chuàng)建StreamingContext 至少要有兩個(gè)線程 一個(gè)線程用于接收數(shù)據(jù) 一個(gè)線程用于處理數(shù)據(jù) val conf = new SparkConf().setAppName("Ops1").setMaster("local[2]") val ssc = new StreamingContext(conf, Milliseconds(3000)) val kafkaParams = Map("metadata.broker.list" -> "uplooking03:9092,uplooking04:9092,uplooking05:9092") val topics = Set("hadoop") val inputDS: InputDStream[(String, String)] = KafkaUtils.createDirectStream[String, String, StringDecoder, StringDecoder](ssc, kafkaParams, topics) inputDS.flatMap(_._2.split(" ")).map((_, 1)).reduceByKey(_ + _).print() ssc.start() ssc.awaitTermination()
6. 實(shí)時(shí)流計(jì)算的架構(gòu)
1. 生成日志(模擬用戶訪問web應(yīng)用的日志)
public class GenerateAccessLog { public static void main(String[] args) throws IOException, InterruptedException { //準(zhǔn)備數(shù)據(jù) int[] ips = {123, 18, 123, 112, 181, 16, 172, 183, 190, 191, 196, 120}; String[] requesTypes = {"GET", "POST"}; String[] cursors = {"/vip/112", "/vip/113", "/vip/114", "/vip/115", "/vip/116", "/vip/117", "/vip/118", "/vip/119", "/vip/120", "/vip/121", "/free/210", "/free/211", "/free/212", "/free/213", "/free/214", "/company/312", "/company/313", "/company/314", "/company/315"}; String[] courseNames = {"大數(shù)據(jù)", "python", "java", "c++", "c", "scala", "android", "spark", "hadoop", "redis"}; String[] references = {"www.baidu.com/", "www.sougou.com/", "www.sou.com/", "www.google.com"}; FileWriter fw = new FileWriter(args[0]); PrintWriter printWriter = new PrintWriter(fw); while (true) { // Thread.sleep(1000); //產(chǎn)生字段 String date = new Date().toLocaleString(); String method = requesTypes[getRandomNum(0, requesTypes.length)]; String url = "/cursor" + cursors[getRandomNum(0, cursors.length)]; String HTTPVERSION = "HTTP/1.1"; String ip = ips[getRandomNum(0, ips.length)] + "." + ips[getRandomNum(0, ips.length)] + "." + ips[getRandomNum(0, ips.length)] + "." + ips[getRandomNum(0, ips.length)]; String reference = references[getRandomNum(0, references.length)]; String rowLog = date + " " + method + " " + url + " " + HTTPVERSION + " " + ip + " " + reference; printWriter.println(rowLog); printWriter.flush(); } } //[start,end) public static int getRandomNum(int start, int end) { int i = new Random().nextInt(end - start) + start; return i; } }
2. flume使用avro采集web應(yīng)用服務(wù)器的日志數(shù)據(jù)
采集命令執(zhí)行的結(jié)果到avro中
# The configuration file needs to define the sources, # the channels and the sinks. # Sources, channels and sinks are defined per agent, # in this case called 'agent' f1.sources = r1 f1.channels = c1 f1.sinks = k1 #define sources f1.sources.r1.type = exec f1.sources.r1.command =tail -F /logs/access.log #define channels f1.channels.c1.type = memory f1.channels.c1.capacity = 1000 f1.channels.c1.transactionCapacity = 100 #define sink 采集日志到uplooking03 f1.sinks.k1.type = avro f1.sinks.k1.hostname = uplooking03 f1.sinks.k1.port = 44444 #bind sources and sink to channel f1.sources.r1.channels = c1 f1.sinks.k1.channel = c1 從avro采集到控制臺(tái) # The configuration file needs to define the sources, # the channels and the sinks. # Sources, channels and sinks are defined per agent, # in this case called 'agent' f2.sources = r2 f2.channels = c2 f2.sinks = k2 #define sources f2.sources.r2.type = avro f2.sources.r2.bind = uplooking03 f2.sources.r2.port = 44444 #define channels f2.channels.c2.type = memory f2.channels.c2.capacity = 1000 f2.channels.c2.transactionCapacity = 100 #define sink f2.sinks.k2.type = logger #bind sources and sink to channel f2.sources.r2.channels = c2 f2.sinks.k2.channel = c2 從avro采集到kafka中 # The configuration file needs to define the sources, # the channels and the sinks. # Sources, channels and sinks are defined per agent, # in this case called 'agent' f2.sources = r2 f2.channels = c2 f2.sinks = k2 #define sources f2.sources.r2.type = avro f2.sources.r2.bind = uplooking03 f2.sources.r2.port = 44444 #define channels f2.channels.c2.type = memory f2.channels.c2.capacity = 1000 f2.channels.c2.transactionCapacity = 100 #define sink f2.sinks.k2.type = org.apache.flume.sink.kafka.KafkaSink f2.sinks.k2.topic = hadoop f2.sinks.k2.brokerList = uplooking03:9092,uplooking04:9092,uplooking05:9092 f2.sinks.k2.requiredAcks = 1
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