Xushaohong opened a new pull request #2677:
URL: https://github.com/apache/ozone/pull/2677
## What changes were proposed in this pull request?
Background:
In a raft based ha cluster, for some reason, we want to transfer leadership
to a specific follower gracefully, now, we have to kill the leader master to
transfer leadership, but the leadership could transfer to an unexpected
follower, we have to kill the leader master again, this is so tricky.
Usage:
This feature is assumed to utilizing a shell command like ```ozone admin
failover [SCM/OM] [host/host:port/'random'] ```, with optional IpAddr we can
transfer the leadership to the target follower, with 'random' we can transfer
leadership to any node except leader node.
Changes:
* the whole procedure is as following
* Phase1:
* server client -> get QuorumInfo from server -> check address whether
in the quorum
*
* Phase2:
* raft client -> set priority -> trigger transferLeadership -> old
leader step down -> new leader take office
P.S.Quorum info includes
(
private RaftGroupId raftGroupId;
private Collection<RaftPeer> peers;
private String leaderRaftPeerId;
)
## What is the link to the Apache JIRA
https://issues.apache.org/jira/browse/HDDS-5686
Please replace this section with the link to the Apache JIRA)
## How was this patch tested?
manual tests.
the Integration test will be added soon
Here are some cases shoted
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