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https://issues.apache.org/jira/browse/IGNITE-27083?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Roman Puchkovskiy updated IGNITE-27083:
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Description:
Currently, TopologyService notifies its listeners on each Scalecube event it
gets. This approach causes some problems.
# When a node is restarted, a reordering might happen such that ADDED is
received before REMOVED/LEAVING, so actually a replacement happens.
# When a node is leaving, it produces LEAVING and then REMOVED; for both
events we generate a Disappeared event
We should change the approach. We should apply the Scalecube event to the
internal representation of the physical topology and then generate our own
event based on the change that happened to the topology. For items described
above:
# When a node is replaced (with the same name, but different ID), we should
generate a couple of events: Disappeared and Appeared (we might consider
addition of another Replaced event for the sake of performance)
# When an already absent node is removed, we should generate no events
> Make physical topology events consistent
> ----------------------------------------
>
> Key: IGNITE-27083
> URL: https://issues.apache.org/jira/browse/IGNITE-27083
> Project: Ignite
> Issue Type: Improvement
> Reporter: Roman Puchkovskiy
> Priority: Major
> Labels: ignite-3
>
> Currently, TopologyService notifies its listeners on each Scalecube event it
> gets. This approach causes some problems.
> # When a node is restarted, a reordering might happen such that ADDED is
> received before REMOVED/LEAVING, so actually a replacement happens.
> # When a node is leaving, it produces LEAVING and then REMOVED; for both
> events we generate a Disappeared event
> We should change the approach. We should apply the Scalecube event to the
> internal representation of the physical topology and then generate our own
> event based on the change that happened to the topology. For items described
> above:
> # When a node is replaced (with the same name, but different ID), we should
> generate a couple of events: Disappeared and Appeared (we might consider
> addition of another Replaced event for the sake of performance)
> # When an already absent node is removed, we should generate no events
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