See the explanation for Step by Step Solution and configuration.
Explanation:
Solution :
valb = a.filter(_%2==0)
a.filter(_ < 4).collect
filter
Evaluates a boolean function for each data item of the RDD and puts the items for which the function returned true into the resulting RDD.
When you provide a filter function, it must be able to handle all data items contained in the
RDD. Scala provides so-called partial functions to deal with mixed data types (Tip: Partial functions to deal are very useful if you have some data which may be bad and you do not want to handle but for the good data (matching data) you want to apply some Kind of map function. The following article is good. It teaches you about partial functions in a very nice way and explains why case has to be used for partial functions:article)
Examples for mixed data without partial functions
val b = sc.parallelize(1 to 8)
b.filter(_ < 4)xollect
res15: Arrayjlnt] = Array(1, 2, 3)
val a = sc.parallelize(List("cat'\ "horse", 4.0, 3.5, 2, "dog"))
a.filter(_<4).collect
error: value < is not a member of Any