• Current Caffeine Cache is single instance (application level) cache
• Upgrade scenarios and multiple CPS instances forced us to use distributed cache instead
• Test without cache turned out to be unacceptable for (de)registration use cases and even OoME's

Introduce Hazelcast Cache to solve above
Remove Caffeine Cache (incl. dependencies)

cache should follow/replace org.onap.cps.api.impl.YangTextSchemaSourceSetCache same KEY and Value!!!

A/C

1. Performance test for (de)registration should be at least as good as with Caffeine Cache. If not report with team/stakeholders
2. Showcase cache-hits using Prometheus instrumentation/logging
3. Update RTD documentation for HazelCast configuration