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[SPARK-19900][CORE] Remove driver when relaunching.
This is apache#17888 . Below are some spark ui snapshots. Master, after worker disconnects: <img width="1433" alt="master_disconnect" src="https://cloud.githubusercontent.com/assets/2576762/26398687/d0ee228e-40ac-11e7-986d-d3b57b87029f.png"> Master, after worker reconnects, notice the `running drivers` part: <img width="1412" alt="master_reconnects" src="https://cloud.githubusercontent.com/assets/2576762/26398697/d50735a4-40ac-11e7-80d8-6e9e1cf0b62f.png"> This patch, after worker disconnects: <img width="1412" alt="patch_disconnect" src="https://cloud.githubusercontent.com/assets/2576762/26398009/c015d3dc-40aa-11e7-8bb4-df11a1f66645.png"> This patch, after worker reconnects: ![image](https://cloud.githubusercontent.com/assets/2576762/26398037/d313769c-40aa-11e7-8613-5f157d193150.png) cc cloud-fan jiangxb1987 Author: Li Yichao <lyc@zhihu.com> Closes apache#18084 from liyichao/SPARK-19900-1.
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