[jboss-user] [JBoss Cache] - What is the purpose of event queue for data eviction ?

Vignesh Prabhu do-not-reply at jboss.com
Fri Sep 16 04:08:33 EDT 2011

Vignesh Prabhu [http://community.jboss.org/people/vigneshprabhu] created the discussion

"What is the purpose of event queue for data eviction ?"

To view the discussion, visit: http://community.jboss.org/message/626837#626837


We use the following jboss cache eviction configuration where in event queue size is 200000 and the wake up interval is 5 seconds for the eviction cleanup timer task. We use LRU as our cleanup policy. The cache region where data recides is /aaa/bbbb and max nodes there is 25,000

What we are trying to achieve is keep adding nodes and data below /aaa/bbbb and we want to keep a max of 25000 newest elements in cache i.e. LRU nodes need to be discarded.

We add and remove data from multiple threads and we keep getting spammed with this warning message 

2011-09-11 18:21:08,446|WARN|pool-flow.seda.servicemix-cxf-se-thread-541|RegionImpl|org.jboss.cache.RegionImpl 245|putNodeEvent(): eviction node event queue size is at 98% threshold value of capacity: 200000 Region: /aaa/bbbb You will need to reduce the wakeUpIntervalSeconds parameter.

Since cleanup interval is 5 seconds and we are not expecting more then 500 elements being inserted per second i.e. 2500 elements need to be discarded every 5 secs once the limit of 25000 elements is reached. 

What is the purpose of event queue for data eviction ? Any help in this regard would be helpful to us.


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