[WIP][CORE][SPARK-28867] InMemoryStore checkpoint to speed up replay log file in HistoryServer#25577

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Ngone51 wants to merge 7 commits intoapache:masterfrom

Ngone51:dev-checkpoint-inmemorystore

Commits on Aug 19, 2019

try
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Commits on Aug 25, 2019

inmemorypont checkpoint
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