[SPARK-4342] [Core]connection ack timeout improvement, replace Timer with ScheudledExecutor...#3207

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haitaoyao wants to merge 2 commits intoapache:masterfrom haitaoyao:connection-monitor-improve

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Commits on Nov 11, 2014

connection ack timeout improvement, replace Timer with ScheudledExecutor to avoid long timeout cause reference message body to OOME
haitaoyao
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rm unused code
haitaoyao
committed