?????????? flink ??????????checkpoint,????????kafka offset????????state,checkpointing????????????????????offset??????kafka,??kafka consumer_topic?????? ????groupid??offset,??????????????????bakup
????????????????checkpoint??????????????????????????????????????????????????-s ??????chkpoint/savepoint?? ????????????????flink??????????state????offset,??????????????kafka??lastest/earliestj???????????? ??????????????kafka??consumer_topic??????topic?????? ??????
