Spark Shell不覆盖方法定义

Question

I'm running Spark 2 - shell with scala 2.11.8 and wondering about the the following behavior, where each line is a block of code to be executed in the shell:

def myMethod()  = "first definition"

val tmp = myMethod(); val out = tmp

println(out) // prints "first definition"

def myMethod()  = "second definition" // override above myMethod

val tmp = myMethod(); val out = tmp 

println(out) // should be "second definition" but is "first definition"

So if I-redefine myMethod , the implementation seems not to be updated in this case. I figured out that the second-last statement ( val out = tmp ) causes this behavior, if this is moved in a separate block, the code works just fine.

So my question: Is this the desired behavior or a bug?

Answer 1

这确实是一个Spark-Shell错误（或更多是Scala REPL错误），将在Spark 2.3中解决： https ： //issues.apache.org/jira/browse/SPARK-20706