* optimize process thread

* revert checkpoint update

* format logger message

* revert logic change

* add cluster_url

* update doc

* add table blacklist and timezone

* update doc

* update doc about obcdc

correct length of output bytes of decompress action

* add logproxy-client workflow pic

* add workflow desc in logproxy-client-tutorial.md

* add docs

* fix javadoc warning

* add maven plugin to check code format

* apply AOSP code format

* add rat plugin for license check

* add missing license header

* run rat in validate phase

* upgrade and make logmessage as a single package

* omit OB unrelated stuffs

* omit duplicant set

* add comment and cleanup redundant class

* update java doc

* add javadoc to listeners

* cleanup exception class