[JCS-51] lost objects

• Type: Question
• Status: Closed
• Priority: Blocker
• Resolution: Invalid
• Affects Version/s: jcs-1.3
• Fix Version/s: jcs-1.3
• Component/s: Indexed Disk Cache
• Environment: java 6 , windows xp
• Assignee: Aaron Smuts
• Reporter: Manfred Quasten
• Created: 10/Sep/08 09:43
• Updated: 21/May/12 12:12
• Resolved: 10/Sep/08 14:07

Description

We will use JCS to create a large number of (large) objects on disk with a smal javaheap size. So I set MaxPurgatorySize=100 and wrote 100000 objects to the cache

id is the counter of the for loop as String.

jcs.putInGroup(id,"aGroup",object);

After this, I tried to read this objects, in an other loop

final int x = (int) (100000*Math.random());

jcs.getFromGroup( "" + x , "aGroup").

get FromGroup will return null in 50% of the cases. What is going wrong?!

I get the cache using

jcs = JCS.getInstance("myRegion1");

I can't increase MaxPurgatorySize=100, because we will work (test working) with a minimum of java heapsize.

Here is my configuration:

#############################################################

1. 1. 1. 1. 1. Default Region Configuration
               jcs.default=DC
               jcs.default.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes
               jcs.default.cacheattributes.MaxObjects=100
               jcs.default.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache
               jcs.default.cacheattributes.UseMemoryShrinker=false
               jcs.default.cacheattributes.ShrinkerIntervalSeconds=60

##############################################################

1. 1. 1. 1. 1. CACHE REGIONS
               jcs.region.myRegion1=DC
               jcs.region.myRegion1.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes
               jcs.region.myRegion1.cacheattributes.MaxObjects=1000000
               jcs.region.myRegion1.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache
               jcs.region.myRegion1.cacheattributes.DiskUsagePattern=UPDATE
               ##############################################################
            2. AUXILIARY CACHES
2. Indexed Disk Cache
   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=dump
   jcs.auxiliary.DC.attributes.MaxPurgatorySize=100
   jcs.auxiliary.DC.attributes.MaxKeySize=-1
   jcs.auxiliary.DC.attributes.OptimizeAtRemoveCount=3000000
   jcs.auxiliary.DC.attributes.OptimizeOnShutdown=true
   jcs.auxiliary.DC.attributes.MaxRecycleBinSize=7500