[
https://issues.apache.org/jira/browse/RATIS-1001?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Glen Geng updated RATIS-1001:
-----------------------------
Description:
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
was:
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.
> expose currentTerm to LeaderInfoProto for supporting SCM-HA.
> ------------------------------------------------------------
>
> Key: RATIS-1001
> URL: https://issues.apache.org/jira/browse/RATIS-1001
> Project: Ratis
> Issue Type: Improvement
> Components: server
> Reporter: Glen Geng
> Assignee: Glen Geng
> Priority: Major
>
> 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
>
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
