1. 說明
本文基於：spark-2.4.0-hadoop2.7-高可用(HA)安裝部署
2. 啟動Spark Shell
在任意一台有spark的機器上執行
1 # --master spark://mini02:7077 連接spark的master，這個master的狀態為alive，而不是standby 2 # --total-executor-cores 2 總共占用2核CPU 3 # --executor-memory 512m 每個woker占用512m內存 4 [yun@mini03 ~]$ spark-shell --master spark://mini02:7077 --total-executor-cores 2 --executor-memory 512m 5 2018-11-25 12:07:39 WARN NativeCodeLoader:62 - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable 6 Setting default log level to "WARN". 7 To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use setLogLevel(newLevel). 8 Spark context Web UI available at http://mini03:4040 9 Spark context available as 'sc' (master = spark://mini02:7077, app id = app-20181125120746-0001). 10 Spark session available as 'spark'. 11 Welcome to 12 ____ __ 13 / __/__ ___ _____/ /__ 14 _\ \/ _ \/ _ `/ __/ '_/ 15 /___/ .__/\_,_/_/ /_/\_\ version 2.4.0 16 /_/ 17 18 Using Scala version 2.11.12 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_112) 19 Type in expressions to have them evaluated. 20 Type :help for more information. 21 22 scala> sc 23 res0: org.apache.spark.SparkContext = org.apache.spark.SparkContext@77e1b84c
注意：
如果啟動spark shell時沒有指定master地址，但是也可以正常啟動spark shell和執行spark shell中的程序，其實是啟動了spark的local模式，該模式僅在本機啟動一個進程，沒有與集群建立聯系。
2.1. 相關截圖
3. 執行第一個spark程序
該算法是利用蒙特•卡羅算法求PI
1 [yun@mini03 ~]$ spark-submit \ 2 --class org.apache.spark.examples.SparkPi \ 3 --master spark://mini02:7077 \ 4 --total-executor-cores 2 \ 5 --executor-memory 512m \ 6 /app/spark/examples/jars/spark-examples_2.11-2.4.0.jar 100 7 # 打印的信息如下： 8 2018-11-25 12:25:42 WARN NativeCodeLoader:62 - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable 9 2018-11-25 12:25:43 INFO SparkContext:54 - Running Spark version 2.4.0 10 ……………… 11 2018-11-25 12:25:49 INFO TaskSetManager:54 - Finished task 97.0 in stage 0.0 (TID 97) in 20 ms on 172.16.1.14 (executor 0) (98/100) 12 2018-11-25 12:25:49 INFO TaskSetManager:54 - Finished task 98.0 in stage 0.0 (TID 98) in 26 ms on 172.16.1.13 (executor 1) (99/100) 13 2018-11-25 12:25:49 INFO TaskSetManager:54 - Finished task 99.0 in stage 0.0 (TID 99) in 25 ms on 172.16.1.14 (executor 0) (100/100) 14 2018-11-25 12:25:49 INFO TaskSchedulerImpl:54 - Removed TaskSet 0.0, whose tasks have all completed, from pool 15 2018-11-25 12:25:49 INFO DAGScheduler:54 - ResultStage 0 (reduce at SparkPi.scala:38) finished in 3.881 s 16 2018-11-25 12:25:49 INFO DAGScheduler:54 - Job 0 finished: reduce at SparkPi.scala:38, took 4.042591 s 17 Pi is roughly 3.1412699141269913 18 ………………
4. Spark shell求Word count 【結合Hadoop】
1、啟動Hadoop
2、將文件放到Hadoop中
1 [yun@mini05 sparkwordcount]$ cat wc.info 2 zhang linux 3 linux tom 4 zhan kitty 5 tom linux 6 [yun@mini05 sparkwordcount]$ hdfs dfs -ls / 7 Found 4 items 8 drwxr-xr-x - yun supergroup 0 2018-11-16 11:36 /hbase 9 drwx------ - yun supergroup 0 2018-11-14 23:42 /tmp 10 drwxr-xr-x - yun supergroup 0 2018-11-14 23:42 /wordcount 11 -rw-r--r-- 3 yun supergroup 16402010 2018-11-14 23:39 /zookeeper-3.4.5.tar.gz 12 [yun@mini05 sparkwordcount]$ hdfs dfs -mkdir -p /sparkwordcount/input 13 [yun@mini05 sparkwordcount]$ hdfs dfs -put wc.info /sparkwordcount/input/1.info 14 [yun@mini05 sparkwordcount]$ hdfs dfs -put wc.info /sparkwordcount/input/2.info 15 [yun@mini05 sparkwordcount]$ hdfs dfs -put wc.info /sparkwordcount/input/3.info 16 [yun@mini05 sparkwordcount]$ hdfs dfs -put wc.info /sparkwordcount/input/4.info 17 [yun@mini05 sparkwordcount]$ hdfs dfs -ls /sparkwordcount/input 18 Found 4 items 19 -rw-r--r-- 3 yun supergroup 45 2018-11-25 14:41 /sparkwordcount/input/1.info 20 -rw-r--r-- 3 yun supergroup 45 2018-11-25 14:41 /sparkwordcount/input/2.info 21 -rw-r--r-- 3 yun supergroup 45 2018-11-25 14:41 /sparkwordcount/input/3.info 22 -rw-r--r-- 3 yun supergroup 45 2018-11-25 14:41 /sparkwordcount/input/4.info
3、進入spark shell命令行，並計算
1 [yun@mini03 ~]$ spark-shell --master spark://mini02:7077 --total-executor-cores 2 --executor-memory 512m 2 # 計算完畢后，打印在命令行 3 scala> sc.textFile("hdfs://mini01:9000/sparkwordcount/input").flatMap(_.split(" ")).map((_, 1)).reduceByKey(_+_).sortBy(_._2, false).collect 4 res6: Array[(String, Int)] = Array((linux,12), (tom,8), (kitty,4), (zhan,4), ("",4), (zhang,4)) 5 # 計算完畢后，保存在HDFS【因為有多個文件組成，則有多個reduce，所以輸出有多個文件】 6 scala> sc.textFile("hdfs://mini01:9000/sparkwordcount/input").flatMap(_.split(" ")).map((_, 1)).reduceByKey(_+_).sortBy(_._2, false).saveAsTextFile("hdfs://mini01:9000/sparkwordcount/output") 7 # 計算完畢后，保存在HDFS【將reduce設置為1，輸出就只有一個文件】 8 scala> sc.textFile("hdfs://mini01:9000/sparkwordcount/input").flatMap(_.split(" ")).map((_, 1)).reduceByKey(_+_, 1).sortBy(_._2, false).saveAsTextFile("hdfs://mini01:9000/sparkwordcount/output1")
4、在HDFS的查看結算結果
1 [yun@mini05 sparkwordcount]$ hdfs dfs -ls /sparkwordcount/ 2 Found 2 items 3 drwxr-xr-x - yun supergroup 0 2018-11-25 15:03 /sparkwordcount/input 4 drwxr-xr-x - yun supergroup 0 2018-11-25 15:05 /sparkwordcount/output 5 drwxr-xr-x - yun supergroup 0 2018-11-25 15:07 /sparkwordcount/output1 6 [yun@mini05 sparkwordcount]$ hdfs dfs -ls /sparkwordcount/output 7 Found 5 items 8 -rw-r--r-- 3 yun supergroup 0 2018-11-25 15:05 /sparkwordcount/output/_SUCCESS 9 -rw-r--r-- 3 yun supergroup 0 2018-11-25 15:05 /sparkwordcount/output/part-00000 10 -rw-r--r-- 3 yun supergroup 11 2018-11-25 15:05 /sparkwordcount/output/part-00001 11 -rw-r--r-- 3 yun supergroup 8 2018-11-25 15:05 /sparkwordcount/output/part-00002 12 -rw-r--r-- 3 yun supergroup 34 2018-11-25 15:05 /sparkwordcount/output/part-00003 13 [yun@mini05 sparkwordcount]$ 14 [yun@mini05 sparkwordcount]$ hdfs dfs -cat /sparkwordcount/output/part* 15 (linux,12) 16 (tom,8) 17 (,4) 18 (zhang,4) 19 (kitty,4) 20 (zhan,4) 21 ############################################### 22 [yun@mini05 sparkwordcount]$ hdfs dfs -ls /sparkwordcount/output1 23 Found 2 items 24 -rw-r--r-- 3 yun supergroup 0 2018-11-25 15:07 /sparkwordcount/output1/_SUCCESS 25 -rw-r--r-- 3 yun supergroup 53 2018-11-25 15:07 /sparkwordcount/output1/part-00000 26 [yun@mini05 sparkwordcount]$ hdfs dfs -cat /sparkwordcount/output1/part-00000 27 (linux,12) 28 (tom,8) 29 (,4) 30 (zhang,4) 31 (kitty,4) 32 (zhan,4)