《Spark编程基础及项目实践》课后习题及答案4.docx

****题4

(1) 常用创立RDD的方法有哪些？ (ABC )A. makeRDD B. parallelize C. textfile D. testfile
(2)下面哪个不是RDD的特点(C )


(1) 常用创立RDD的方法有哪些？ (ABC )A. makeRDD B. parallelize C. textfile D. testfile
(2)下面哪个不是RDD的特点(C )




(3)下面哪一种全部是转化操作？( C )A. map、take> reduceByKeyB. map、filter> collect
C. map、zip> reduceByKeyD. map> join、take
（4）下面哪种按键操作的方法返回值可以与输入类型不同？ （ B ）A. reduceByKey
C. sortByKey
A. reduceByKey
C. sortByKey
B bineByKey
（5）使用saveAsTextFile存储数据到HDFS,要求数据类型为什么？ （ D ）A. . Seq
2 .操作题
-8所示，文件中包含了多行句子，现在要求对文 档中的单词计数，并把单词计数超过3的结果存储到HDFS上。
WHat is going on there?
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