Nan Zhu 785094db53
[jvm-packages] fix issue when spark job execution thread cannot return before we execute first() (#3758)
* add back train method but mark as deprecated

* add back train method but mark as deprecated

* add back train method but mark as deprecated

* add back train method but mark as deprecated

* fix scalastyle error

* fix scalastyle error

* fix scalastyle error

* fix scalastyle error

* sparjJobThread

* update

* fix issue when spark job execution thread cannot return before we execute first()
2018-10-05 22:20:50 -07:00
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