[jboss-jira] [JBoss JIRA] Commented: (JBCACHE-709) Out of memory problem

[Sudhakar Pandey (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBCACHE-709?page=comments#action_12340068 ] 
            
Sudhakar Pandey commented on JBCACHE-709:
-----------------------------------------

Thanks Ben for your valuable insights.......

I agree with you that when we do not configure, eviction is off. But when we do configure and remove the cached objects properly from the cache then why memory usage increases. 

I hope I am putting my point properly. Ok here I am giving a simple example: 
"Suppose the eviction policy is ON and we put Object X in TreeCache and then removed the Object X from TreeCache. This means, now  there is no object present in the cache and there is nothing to clean. Then why the memory leak is happening?"

Thanks once again.


> Out of memory problem
> ---------------------
>
>                 Key: JBCACHE-709
>                 URL: http://jira.jboss.com/jira/browse/JBCACHE-709
>             Project: JBoss Cache
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>    Affects Versions: 1.2.4SP2
>         Environment: Windows NT, Ecliplse IDE and Pentium 4 processor.
>            Reporter: Sudhakar Pandey
>         Assigned To: Manik Surtani
>            Priority: Critical
>         Attachments: TreeCache.xml
>
>
> Problem:
> ~~~~~~~
> While running the following testcase after entering 66666 records my system program is getting hang.
> Following is the description of program:
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> I am putting some String object in TreeCache, accessing it and then removing it from the cache. I am doing this in a infinite loop. 
> Following is the eviction policy:
> ~~~~~~~~~~~~~~~~~~~~~~~
>         <attribute name="EvictionPolicyConfig">
>            <config>
>               <attribute name="wakeUpIntervalSeconds">72000</attribute>
>               <!-- Cache wide default -->
>               <region name="/_default_">
>               	<attribute name="maxNodes">500</attribute>
> 	          	<attribute name="timeToLiveSeconds">180</attribute>
> 			  	<!-- Maximum time an object is kept in cache regardless of idle time -->
> 			  	<attribute name="maxAgeSeconds">7200</attribute>
>               </region>
>               <!-- yodlee wide default -->
>               <region name="/com/yodlee">
>                 <attribute name="maxNodes">500</attribute>
> 	          	<attribute name="timeToLiveSeconds">180</attribute>
> 			  	<!-- Maximum time an object is kept in cache regardless of idle time -->
> 			  	<attribute name="maxAgeSeconds">7200</attribute>
>               </region>                          
>            </config>
>         </attribute>
> *IMPORTENT*: If I reduce the 'wakeUpIntervalSeconds' then there is no leak. However, I can reduce this time coz it eats up lots of CPU. 
> I have attached the Tree Cache Configuration xml file also.
> Program:
> ~~~~~~~
> public void testTreeCache(){
> 		TreeCache treeCache;
> 		try {
> 			treeCache = new TreeCache();
> 			treeCache.setCacheMode(TreeCache.LOCAL);
> 			
> 			// configure TreeCache
> 			PropertyConfigurator config = new PropertyConfigurator();  
> 			config.configure(treeCache, "com/yodlee/core/system/services/cacheservice/TreeCache.xml");
> 			
> 			treeCache.startService();			
> 			String identifier = "Test/MemoryLeak/";
> 			String key = "key";
> 			String value = "JBoss Cache is a product designed to cache frequently accessed Java objects in order to dramatically improve the performance of e-business applications. By eliminating unnecessary database access, JBoss Cache decreases network traffic and increases the scalability of applications.";
> 			for(int i=0;;i++)
> 			{
> 				System.out.println("Putting key=" + (key +i));
> 				treeCache.put(identifier, key +i, value);
> 				System.out.println(treeCache.get(identifier, key + i));
> 				System.out.println("Removing key=" + (key+i));
> 				treeCache.remove(identifier, key + i);			
> 				
> 			}
> 			//treeCache.stopService();
> 		} catch (Exception e) {
> 			MessageController.log(JBossCacheServiceImpl.class.getName(), 1,
> 					ExceptionHelper.getExceptionStackTrace(e),
> 					MessageController.FATAL);
> 			throw new CoreException(ExceptionHelper.getExceptionStackTrace(e));
> 		}
> 	}

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