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https://issues.apache.org/jira/browse/IGNITE-21213?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kirill Sizov reassigned IGNITE-21213:
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Assignee: Kirill Sizov
> Coordination of mechanisms of determination for primary on replicaside
> ----------------------------------------------------------------------
>
> Key: IGNITE-21213
> URL: https://issues.apache.org/jira/browse/IGNITE-21213
> Project: Ignite
> Issue Type: Bug
> Reporter: Vladislav Pyatkov
> Assignee: Kirill Sizov
> Priority: Major
> Labels: ignite-3
>
> h3. Motivation
> In the replica listener, we have unconsidered mechanisms between each other
> to determine primary replica. The first one is based on the placement driver
> API (it is used in {_}PartitionReplicaListener#ensureReplicaIsPrimary{_}) and
> the other one is based on the placement driver events (the events are handled
> by two methods: {_}ReplicaManager#onPrimaryReplicaElected{_},
> {_}ReplicaManager#onPrimaryReplicaExpired{_}).
> Because the replica messages and events are handled in different threads, any
> variety of processing is possible. For example, the replica can release all
> transaction locks (by PRIMARY_REPLICA_EXPIRED event) and then handle a
> message for this transaction (because ensureReplicaIsPrimary was done
> before), assuming that all the locks are being held.
> h3. Definition of done
> The simultaneous processing of transactional requests and
> PRIMARY_REPLICA_EXPIRED is impossible.
>
> *Implementation notes*
> We must take into account and prevent the possible deadlocks, such as:
> * the transactional request is trying to acquire the lock on the key A
> * the processing of the PRIMARY_REPLICA_EXPIRED cannot start because the
> aforementioned request processing is not finished
> * the lock on the key A can't be acquired because it should be released by
> the listener of PRIMARY_REPLICA_EXPIRED due to the replica expiration.
> Probably the event of replica expiration should invalidate the ongoing
> transactional requests and complete them.
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