Eviction statistics Configuration

[vedanth]

Hi,

     Am using jboss 7.1.1 along with hibernate and infinispan for caching. Am struck with the statistics configuration.

Once the entities are loaded on to the cache, from jconsole i can get the following statistics readWriteRatio, evictions, timeSinceReset, elapsedTime, averageReadTime, removeHits, removeMisses    

hitRatio, numberOfEntries , misses, hits, averageWriteTime, stores which is very useful.

However is there any way to get the statistics for the following scenarios:

1>Number  of entities evicted because of max_idle expiration.

2>Number of entities evicted because of LRU eviction.

3>Heap space occupied by each entity cache regin.

What does the evictions attribute shown in jconsole actually indicate? max_idle eviction or LRU eviction.

The evictions attribute shown in jconsole shows 0 always.

Configuration in persistence.xml for cache:

--------------------------------------------------------------

<property name="hibernate.cache.infinispan.entity.eviction.strategy" value= "LRU"/>

<property name="hibernate.cache.infinispan.entity.expiration.wake_up_interval" value= "2000"/>

<property name="hibernate.cache.infinispan.entity.eviction.max_entries" value= "8"/>

<property name="hibernate.cache.infinispan.entity.expiration.max_idle" value= "180000"/>

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

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

Thanks,

Vedanth

[mgencur]

The answers are the following:

1) - NO

2) - NO (only the number of evicted entries, no matter if the strategy is LRU or LIRS

3) - NO

The maxIdle attribute is not related to "eviction" but to "expiration", i.e. eviction means that entries are evicted from memory (using either LIRS or LRU) but typically moved to a persistent storage, the expiration means that entries are removed altogether (and cluster wide) - not moved to a pers. storage