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16.7. Troubleshooting
16.7.1. Expiration Troubleshooting
If expiration does not appear to be working, it may be due to an entry being marked for expiration but not being removed.
Multiple-cache operations such as
put() are passed a life span value as a parameter. This value defines the interval after which the entry must expire. In cases where eviction is not configured and the life span interval expires, it can appear as if JBoss Data Grid has not removed the entry. For example, when viewing JMX statistics, such as the number of entries, you may see an out of date count, or the persistent store associated with JBoss Data Grid may still contain this entry. Behind the scenes, JBoss Data Grid has marked it as an expired entry, but has not removed it. Removal of such entries happens in one of two ways:
- Any attempt to use
get()orcontainsKey()for the expired entry, causes JBoss Data Grid to detect the entry as an expired one and remove it. - Enabling the eviction feature causes the eviction thread to periodically detect and purge expired entries.
