Nan Zhu 05243642bb
[jvm-packages] better fix for shutdown applications (#4108)
* intentionally failed task

* throw exception

* more

* stop sparkcontext directly

* stop from another thread

* new scope

* use a new thread

* daemon threads

* don't join the killer thread

* remove injected errors

* add comments
2019-02-07 09:02:17 -08:00
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