EnableLocalClientRole init localable roles.

GetDataCoordClient return data coord client.

GetQueryCoordClient return query coord client.

GetRootCoordClient return root coord client.

MustGetLocalRootCoordClientFuture return root coord client future, panic if root coord client is not enabled.

RegsterDataCoordServer register data coord server.

RegisterQueryCoordServer register query coord server.

RegisterRootCoordServer register root coord server.