Github user davies commented on the pull request:
https://github.com/apache/spark/pull/3029#issuecomment-62480890
@kayousterhout @squito The motivation of this PR is to allow user to see
the progress without flushing away their input/output, so it's better to have a
one-line progress bar. For example
```scala
scala> rdd.count()
[Stage 1] finished in xxx seconds (med/avg/xxxx)
res0: Int = xxxx
```
If we put the progress bar into normal logging infrastructure (as level
WARN), also do not mix them into one-line, then this will much easier, but not
as good as current approach to users (it's still noisy).
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