up log max record size to 4MB (#513)

Add Doc (#510)

version to 8.6.0 (#504)

Merge pull request #498 from YangSen-qn/develop

connect config support get from server

Merge pull request #494 from YangSen-qn/multi-region

change CHANGELOG.md

Merge pull request #485 from YangSen-qn/develop

add ap-northeast-1

Update CHANGELOG.md

Merge pull request #484 from YangSen-qn/develop

handle dns thread poo

Update Constants.java

version to 8.3.4