Feature/race refractor#37

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chenneal wants to merge 5 commits intomasterfrom

feature/race_refractor

Commits on Jan 8, 2021

Reformat code style conform to google style
chenneal
committed

Commits on Jan 11, 2021

Commits on Jan 12, 2021

Fix data race problem on statistic module related to metric
chenneal
committed

Commits on Jan 18, 2021

Fix data race problem related to leap array and event loop
chenneal
committed