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https://issues.apache.org/jira/browse/IGNITE-8922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16546178#comment-16546178
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Denis Mekhanikov commented on IGNITE-8922:
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[~dkarachentsev], losing discovery messages is much more harmful, since it may
lead to the whole cluster being stuck.
On the other hand, if a node fails with OOME, then it's only a problem of one
node. And in order to make it happen, discard messages should not be delivered
for a really long time, which is quite unlikely.
So, I think, that nodes should either guarantee delivery of all discovery
messages, that are passed to them, or die.
> Discovery message delivery guarantee can be violated
> ----------------------------------------------------
>
> Key: IGNITE-8922
> URL: https://issues.apache.org/jira/browse/IGNITE-8922
> Project: Ignite
> Issue Type: Bug
> Affects Versions: 2.5
> Reporter: Denis Mekhanikov
> Assignee: Denis Mekhanikov
> Priority: Critical
> Fix For: 2.7
>
> Attachments: PendingMessageResendTest.java
>
>
> Under certain circumstances discovery messages may be delivered only to a
> part of nodes.
> It happens because pending messages are not resent due to data inconsistency
> in {{ServerImpl#PendingMessages}} class. If {{discardId}} or
> {{customDiscardId}} point to a message, that is not present in the queue,
> then other messages will be skipped and won't be resent. It may happen, for
> example, when queue in {{PendingMessages}} is overflown.
> PFA test, that reproduces this problem.
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