"ISPN000025: wakeUpInterval is <= 0, not starting expired purge thread" when enabling query cache in JBoss EAP

Solution Verified - Updated

Environment

  • Red Hat JBoss Enterprise Application Platform (EAP) 7.3
  • Hibernate 5.3 (JPA)
  • Infinispan 9.4

Issue

  • In persistence.xml added the below to enable query cache

    <property name="hibernate.cache.use_query_cache" value="true"/>

  • During deployment, the message below is logged

    ... INFO  [org.infinispan.expiration.impl.ExpirationManagerImpl] (<THREAD_ID_HERE>) ISPN000025: wakeUpInterval is <= 0, not starting expired purge thread

Resolution

  • The message can be ignored as content of the timestamps cache should not be independently timed-out/reaped so no purge thread is required.
  • There is an open issue to address this in a future release1.

Root Cause

  • This is a side effect enabling query cache which has a corresponding timestamps cache (with default configuration). Timestamps will be scoped to the lifetime of result sets in the query cache and do not require independent life cycle management.
  • Note that the upstream/community documentation for Hibernate Content from docs.jboss.org is not included.recommends that the timestamps cache for query caching not be explicitly configured for timeout/expiration.

Diagnostic Steps

Used the Byteman rules below to identify the cache region associated with the event

RULE org.infinispan.expiration.impl.ExpirationManagerImpl.start
CLASS org.infinispan.expiration.impl.ExpirationManagerImpl
METHOD start
IF $0.configuration.expiration().wakeUpInterval() <= 0
DO traceStack("[BMAN] ExpirationManagerImpl.start() configuration=" + $0.configuration + ")\n", 25);
ENDRULE

RULE org.infinispan.cache.impl.CacheImpl.start
CLASS org.infinispan.cache.impl.CacheImpl
METHOD start
IF true
DO System.out.println("[BMAN] CacheImpl.start for " + $0.getName());
ENDRULE
SBR
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