[jira] [Created] (IGNITE-15632) Investigate jraft's BallotBox optimisation in case of removing peer

["Mirza Aliev (Jira)" <ji...@apache.org>]

Mirza Aliev created IGNITE-15632:
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             Summary: Investigate jraft's BallotBox optimisation in case of removing peer
                 Key: IGNITE-15632
                 URL: https://issues.apache.org/jira/browse/IGNITE-15632
             Project: Ignite
          Issue Type: Improvement
            Reporter: Mirza Aliev


{{org.apache.ignite.raft.jraft.core.BallotBox#commitAt}} method contains comment from jraft developers about optimization which commits uncommitted logs in case of decreasing of quorum. This optimization is not proven, needs to be investigated.

Comment:
{noformat}
            // When removing a peer off the raft group which contains even number of
            // peers, the quorum would decrease by 1, e.g. 3 of 4 changes to 2 of 3. In
            // this case, the log after removal may be committed before some previous
            // logs, since we use the new configuration to deal the quorum of the
            // removal request, we think it's safe to commit all the uncommitted
            // previous logs, which is not well proved right now
{noformat}

Ticket was created after the decomposition of https://issues.apache.org/jira/browse/IGNITE-14832
 See todo in {{org.apache.ignite.raft.jraft.core.BallotBox#commitAt}}



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