GlenGeng opened a new pull request #151:
URL: https://github.com/apache/incubator-ratis/pull/151
## What changes were proposed in this pull request?
During SCM-HA, SCM not only needs to know whether it is a leader, but also
needs to know which term it is in charge of.
Assume such a case: underlying raft node was leader on term 1, then step
down as follower on term 2, then init election and become leader again on term
3. If term is not exposed together with leader information, SCM can not
distinguish a leader of term 1 from that of term 3.
BTW the way, according to nanda's design, SCM need propagate its term to
Datanode, `RaftServerImpl::getRoleInfoProto` will be a good place to expose
term from Ratis to SCM
## What is the link to the Apache JIRA
https://issues.apache.org/jira/browse/RATIS-1001
## How was this patch tested?
CI
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