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

[Sudhakar Pandey (JIRA)]

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


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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