cherry pick: 0208#3856

Merged

critical27 merged 3 commits intov3.0.0from cherry-pick-v3.0.0-0208

Feb 9, 2022

+37-27

Commits on Feb 8, 2022

skip heartbeat when role in meta client is not set (#3855 )

critical27
authored and
Sophie-Xie
committed
Try to improve the performance of appendVertices (#3857 )

jievince
authored and
Sophie-Xie
committed
keep consistent with 2.6.x (#3859 )

HarrisChu
authored and
Sophie-Xie
committed