Github user hhbyyh commented on the pull request:
https://github.com/apache/spark/pull/7871#issuecomment-127111587
Oh I should have made it more clear. An example:
```
def run(): Unit ={
val conf = new SparkConf().setMaster("local").setAppName("ss")
val sc = new SparkContext(conf)
val multiTimer = new MultiStopwatch(sc)
for(i <- 0 to 2) {
someFunction(multiTimer)
}
}
def someFunction(multiTimer: MultiStopwatch): Unit ={
multiTimer.addLocal("total")
multiTimer("total").start()
// ...
multiTimer("total").stop()
}
```
will throw `Exception in thread "main" java.lang.IllegalArgumentException:
requirement failed: Stopwatch with name total already exists.`
This is probably by design, yet it's not quite handy. Since users will have
to:
1. avoid passing MultiStopwatch around as a parameter
2. or avoid invoking `someFunction` multiple times.
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