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https://issues.apache.org/jira/browse/IGNITE-11555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16795820#comment-16795820
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Alexey Goncharuk commented on IGNITE-11555:
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[~Jokser] can you take a look at the changes?
> Unable to await partitions release latch caused by coordinator failover
> -----------------------------------------------------------------------
>
> Key: IGNITE-11555
> URL: https://issues.apache.org/jira/browse/IGNITE-11555
> Project: Ignite
> Issue Type: Bug
> Reporter: Alexey Goncharuk
> Assignee: Alexey Goncharuk
> Priority: Critical
> Fix For: 2.8
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Currently exchanges latches (both server and client) are deleted when the
> latch is completed. This leads to a hang in the following scenario:
> 1) A grid with several nodes starts exchange latch sync
> 2) All nodes send acks to coordinator
> 3) Coordinator processes acks and sends final acks to some of the nodes
> 4) These nodes process acks, complete and delete client latches
> 5) Coordinator fails
> 6) Nodes which did not receive final acks re-send the ack to a new coordinator
> 7) Since the new coordinator already completed and deleted the client latch,
> it does not process re-sent ack correctly and only adds it to the pending
> messages.
> Looks like the root cause of this issue is latch deletion on final ack. We
> can safely delete the latch only when all nodes are guaranteed to process the
> messages. Luckily, since the latch is tied to the exchange process, we can
> safely delete the latch when the corresponding exchange completes.
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