Denis Chudov created IGNITE-24072:
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Summary: Improve Raft configuration listener in order to process
the pending assignments queue
Key: IGNITE-24072
URL: https://issues.apache.org/jira/browse/IGNITE-24072
Project: Ignite
Issue Type: Improvement
Reporter: Denis Chudov
* The Raft configuration listener should also read pending assignments from
meta storage interpreting them as a queue;
* If there is one element in the queue, the configuration listener works in
the same way as it does now: it saves the new Raft configuration as the stable
assignments, and pending assignments entry in meta storage should be either
removed or replaced with planned assignments if they exist, the planned
assignments are also transformed in PAQ here;
* If there is more than one element in PAQ, it means that the first element
was just applied to the configuration. The listener should remove the first
element from PAQ and save the new PAQ value to meta storage (through CAS with
revision check, this logic remains). It also verifies that the target pending
configuration is able to be achieved from the current one through the given
PAQ, and if not, it should create the new PAQ. In this point, rebalancing is
not completed and no more actions on this listener are required now;
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