saprkStreaming NetworkWordCount案例

NetworkWordCount.scala源码

import org.apache.spark.SparkConf
import org.apache.spark.streaming.{Seconds, StreamingContext}
import org.apache.spark.streaming.StreamingContext._
import org.apache.spark.storage.StorageLevel
/**
* Counts words in UTF8 encoded, 'n' delimited text received from the network every second.
*
* Usage: NetworkWordCount <hostname> <port>
* <hostname> and <port> describe the TCP server that Spark Streaming would connect to receive data.
*
* To run this on your local machine, you need to first run a Netcat server
*
`$ nc -lk 9999`
* and then run the example
*
`$ bin/run-example org.apache.spark.examples.streaming.NetworkWordCount localhost 9999`
*/
object NetworkWordCount {
def main(args: Array[String]) {
if (args.length < 2) {
System.err.println("Usage: NetworkWordCount <hostname> <port>")
System.exit(1)
}
StreamingExamples.setStreamingLogLevels()
// Create the context with a 1 second batch size
val sparkConf = new SparkConf().setAppName("NetworkWordCount")
val ssc = new StreamingContext(sparkConf, 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')
// Note that no duplication in storage level only for running locally.
// Replication necessary in distributed scenario for fault tolerance.
val lines = ssc.socketTextStream(args(0), args(1).toInt, StorageLevel.MEMORY_AND_DISK_SER)
val words = lines.flatMap(_.split(" "))
val wordCounts = words.map(x => (x, 1)).reduceByKey(_ + _)
wordCounts.print()
ssc.start()
ssc.awaitTermination()
}
}

使用spark-submit来提交我们的spark应用程序运行的脚本(生产)

./spark-submit --master local[2] 
--class org.apache.spark.examples.streaming.NetworkWordCount 
--name NetworkWordCount 
/home/hadoop/app/spark-2.2.0-bin-2.6.0-cdh5.7.0/examples/jars/spark-examples_2.11-2.2.0.jar localhost 9999

> /home/hadoop/app/spark-2.2.0-bin-2.6.0-cdh5.7.0/examples/jars/spark-examples_2.11-2.2.0.jar localhost 9999
Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties
17/12/29 09:14:46 INFO StreamingExamples: Setting log level to [WARN] for streaming example. To override add a custom log4j.properties to the classpath.
17/12/29 09:14:47 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
17/12/29 09:14:47 WARN Utils: Service 'SparkUI' could not bind on port 4040. Attempting port 4041.
-------------------------------------------
Time: 1514510089000 ms
-------------------------------------------
-------------------------------------------
Time: 1514510090000 ms
-------------------------------------------
-------------------------------------------

nc -lk 9999

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