Vyacheslav Tutrinov created HDDS-11742:
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Summary: SCM leadership metric set to null even if the LEADER is
defined
Key: HDDS-11742
URL: https://issues.apache.org/jira/browse/HDDS-11742
Project: Apache Ozone
Issue Type: Bug
Components: SCM
Affects Versions: 2.0.0
Reporter: Vyacheslav Tutrinov
Assignee: Vyacheslav Tutrinov
SCM leadership metric was introduced in HDDS-8363.
On starting of the SCM server the Raft server instance initialized earlier than
the SCM HTTP server initializer set the leader to null:
{code:java}
// At this point leader is not known
scmHAMetricsUpdate(null);
{code}
Log entries of the SCM server instance at start-up time:
{code}
2024-11-18 11:09:29,981
[ae525b25-2774-4f91-9bbc-83884c1f472d@group-F219F5C50F0F-FollowerState] INFO
server.RaftServer$Division:
ae525b25-2774-4f91-9bbc-83884c1f472d@group-F219F5C50F0F: changes role from
FOLLOWER to CANDIDATE at term 4 for changeToCandidate
...
2024-11-18 11:09:30,412
[ae525b25-2774-4f91-9bbc-83884c1f472d@group-F219F5C50F0F-LeaderElection1] INFO
server.RaftServer$Division:
ae525b25-2774-4f91-9bbc-83884c1f472d@group-F219F5C50F0F: changes role from
CANDIDATE to LEADER at term 5 for changeToLeader
...
2024-11-18 11:09:41,593 [main] INFO http.BaseHttpServer: HTTP server of scm
listening at http://0.0.0.0:9876
// At this point the leadership metric will be reset to null!
{code}
SCM HTTP server initializer shouldn't reset the metric to null if the latter
was initialized already with the raft server initializer
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