Alexander Lapin created IGNITE-18085:
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Summary: Implement logical topology events subscription and
notification
Key: IGNITE-18085
URL: https://issues.apache.org/jira/browse/IGNITE-18085
Project: Ignite
Issue Type: Improvement
Reporter: Alexander Lapin
h3. Motivation
There are two types of typologies in Apache Ignite 3
* Physical(Network) - nodes that are visible through network layer.
* Logical - nodes that successfully passed the join procedure including local
recovery and catch up phases, thus nodes that are ready to handle user load.
More details in IEP-77
In order to recalculate data nodes for specific distribution zone (see
[IEP-97|https://cwiki.apache.org/confluence/display/IGNITE/IEP-97%3A+Distribution+Zones])
it's required for distribution zone manager to receive notifications about
logical topology updates similar to ones we have in network topology:
* onAppeared
* onDisappeared
h3. Definition of Done
* It's possible to register listeners for logical topology
onAppeared/onDisappeared events
* Events are fired in a distributed manner to all recipients.
* Each event produces ClusterNode that was either added or removed. Meaning
that both consistentId and id are important.
* Events are ordered within each Producer to Recipient communication channel.
* It's valid to have multiple producers, e.g. during CMG leader change, thus
it's valid to send same set of event twice but order still matters.
* It's not valid to skip events (debateble), thus in case of CMG leader
change, new one should check whether some events weren't send and send them.
* Delivery guarantee is required (debateble).
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