Why there is a difference between the API call size() and the JMX clustered stats numberOfEntries when counting the entries within the JDG cache

Solution Verified - Updated -

Issue

  • The Cache API size() shows the correct number of items within the cache, but the JMX attribute jboss.datagrid-infinispan.distSyncCache.ContainerName.ClusterCacheStats.numberOfEntries shows a different number
  • It is expected that the current cache size can monitored by using JMX attribute ClusterCacheStats.numberOfEntries but it does not show the correct number of entries
  • If passivation is enabled the cache statistic provided by JMX shows incorrect numbers

Environment

  • Red Hat JBoss Data Grid (RDG; JDG)
    • 7.1
    • 7.0
    • 6

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