Red Hat Single Sign-On Considerations for handling a large number of offline sessions when a pod is down

Issue

When a pod is down, there are no new requests satisfied (tokens) until the pod is properly started, and this takes too much time for a highly concurrent environment.

The following exceptions may be seen on the RHSSO_HOME/standalone/log/server.log file

[0m[31m03:06:59,520 ERROR [org.keycloak.services.error.KeycloakErrorHandler] (default task-19) Uncaught server error: org.infinispan.util.concurrent.TimeoutException: ISPN000476: Timed out waiting for responses for request 6299 from sso-12-c282j
    at org.infinispan@9.4.23.Final-redhat-00001//org.infinispan.interceptors.impl.AsyncInterceptorChainImpl.invoke(AsyncInterceptorChainImpl.java:259)
    at org.infinispan@9.4.23.Final-redhat-00001//org.infinispan.cache.impl.CacheImpl.executeCommandAndCommitIfNeeded(CacheImpl.java:1915)
    at org.infinispan@9.4.23.Final-redhat-00001//org.infinispan.cache.impl.CacheImpl.remove(CacheImpl.java:680)
    at org.infinispan@9.4.23.Final-redhat-00001//org.infinispan.cache.impl.DecoratedCache.remove(DecoratedCache.java:559)
    at org.infinispan@9.4.23.Final-redhat-00001//org.infinispan.cache.impl.AbstractDelegatingCache.remove(AbstractDelegatingCache.java:453)
    at org.infinispan@9.4.23.Final-redhat-00001//org.infinispan.cache.impl.EncoderCache.remove(EncoderCache.java:738)
    at org.infinispan@9.4.23.Final-redhat-00001//org.infinispan.cache.impl.AbstractDelegatingCache.remove(AbstractDelegatingCache.java:453)
...