Github user sarutak commented on the pull request:
https://github.com/apache/spark/pull/9059#issuecomment-147448778
I applied your patch and I noticed you didn't care the case we watch the
status of incomplete apps through the history server.
Sometimes, apps are marked as incomplete because of some reasons e.g. users
forget to stop `SparkContext`, those apps are just running or etc.
When we watch the status of those incomplete apps through the history
server, `endTime` should still be `-1` and then, we can get invalid Total
Uptime like this screen shot.
<img width="1269" alt="invaliduptime"
src="https://cloud.githubusercontent.com/assets/4736016/10432636/66b40c7a-7147-11e5-8afc-3a725308312f.png";>
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