Christian Schneider created SLING-12378:
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Summary: Simplify handling of topology changes
Key: SLING-12378
URL: https://issues.apache.org/jira/browse/SLING-12378
Project: Sling
Issue Type: Improvement
Components: Content Distribution
Reporter: Christian Schneider
Assignee: Christian Schneider
Fix For: Content Distribution Journal Core 0.5.0
Currently we have a complex system to build a Topology and notify on changes.
* DiscoveryService receives Discovery message
* DiscoveryService calls TopologyViewManager to update State of a subscriber
(publish pod in k8s)
* States are kept forever even if the subscriber dies
Then every 5s we create a TopologyView which contains the alive subscribers
(reported with TTL).
Then we compute a diff between old and new topology view and call a listener
with the diffs. At the end we set the new view as current view.
I propose we remove view and diff and simply notify the listener when we
receive a DiscoveryMessage. When asked for the current view we simply compute
the view from the alive states.
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