Denis Chudov created IGNITE-25653:
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Summary: Primary replica negotiation may fail on replica side due
to raft server overload
Key: IGNITE-25653
URL: https://issues.apache.org/jira/browse/IGNITE-25653
Project: Ignite
Issue Type: Bug
Reporter: Denis Chudov
*Problem:*
When receiving LeaseGrantRequest, replica always performs a couple of raft
operations:
* read index
* running PrimaryReplicaChangeCommand
* and in the case when force flag is true - transferLeadership.
Raft internal disruptors are shared between groups. So, if the raft internals
on Ignite node where the group leader of the given replica is located are
overloaded then the mentioned raft commands will fail and the replica would not
be able to process LeaseGrantRequest. This may look surprising because in the
absence of primary replica there cannot be any load on this group, but there
would be exception about overload.
*Proposals:*
* introduce SystemWriteCommand which is never rejected by raft client by
overload reason;
* or add separate method to RaftGroupService (like #primaryReplicaChange() )
which works in the same way (never rejected).
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