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From "rushi (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCS-62) not able to deallocate the disk memory
Date Tue, 14 Jul 2009 10:23:14 GMT
not able to deallocate the disk memory
--------------------------------------

                 Key: JCS-62
                 URL: https://issues.apache.org/jira/browse/JCS-62
             Project: JCS
          Issue Type: Bug
          Components: Indexed Disk Cache
    Affects Versions: jcs-1.3
         Environment: Windows Xp,RAD,java5,AMD processor
            Reporter: rushi
            Assignee: Aaron Smuts
             Fix For: jcs-1.3


I have configured the JCS to store the cached objects in disk using below properties.

    jcs.region.report.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes
    jcs.region.report.cacheattributes.MaxObjects=2
    jcs.region.report.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache
    jcs.region.report.cacheattributes.UseMemoryShrinker=true
    jcs.region.report.elementattributes.MaxLifeSeconds=60
jcs.region.testCache1.cacheattributes.MaxMemoryIdleTimeSeconds=60
    jcs.region.report.cacheattributes.ShrinkerIntervalSeconds=10
    jcs.region.report.cacheattributes.MaxSpoolPerRun=300
    jcs.region.report.elementattributes=org.apache.jcs.engine.ElementAttributes
    jcs.region.report.elementattributes.IsEternal=false
   
    jcs.auxiliary.DC=org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCacheFactory
    jcs.auxiliary.DC.attributes=org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCacheAttributes
    jcs.auxiliary.DC.attributes.DiskPath=c:/tempcache
   jcs.auxiliary.DC.attributes.ClearDiskOnStartup=true
    jcs.auxiliary.DC.attributes.maxKeySize=100000

I tried to cache 100 objects. JCS cached the first 2 objects in the java memory as I specified
 jcs.region.report.cacheattributes.MaxObjects=2. The remaining objects gets cached in the
disk file in c:/tempcache/report.data. After 60 (MaxLifeSeconds) seconds the objects stored
in java memory got deleted. I am able to identify this by looking at the log file, it has
log message like "Exceeded maxLifeSeconds: key name".

I could not see above log message for the cached objects in disk after 60 seconds. I believe
that objects stored on disk never get deleted but the surprise thing is if i try to access
the cached object in disk after 60 seconds, it is returning null, that means the object has
expired. But JCS is not deallocating the memory occupied by that expired object. 
Is it possible to deallocate that memory occupied when the object gets expired? I thought
of asking this as I need to cache lot of data. If I am not able to deallocate the memory ,
the file size gets increased and might get exception.

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