Automated cherry pick of #11987#12075

Merged

gyuho merged 1 commit intoetcd-io:release-3.3from cfc4n:automated-cherry-pick-of-#11987-upstream-release-3.3

Jun 26, 2020

+2-3

Commits on Jun 25, 2020

mvcc: chanLen 1024 is to biger,and it used more memory. 128 seems to be enough. Sometimes the consumption speed is more than the production speed.
cfc4n
committed