Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/6301#issuecomment-104110204
I just tried this out on a real cluster and it works well. The output from
`ExecutorAllocationManager` are now more understandable:
```
INFO ExecutorAllocationManager: Lowering target number of executors to 305
because not all requests are actually needed (previously 307)
INFO ExecutorAllocationManager: Lowering target number of executors to 301
because not all requests are actually needed (previously 305)
INFO ExecutorAllocationManager: Lowering target number of executors to 298
because not all requests are actually needed (previously 301)
...
```
Before this patch, we were getting a bunch of `Requesting 0 new
executor(s)` (see SPARK-7779).
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