[jboss-user] [JBoss Cache: Core Edition] - Re: Eviction problems: Thread executing before specified tim
Hi Galder,
First of all, thank you for your response.
1) Client code
public static void main(String[] args) throws Exception {
|
| CacheFactory factory = new DefaultCacheFactory();
| Cache cache = factory.createCache("cache-config.xml");
| Node rootNode = cache.getRoot();
|
| //1. Add 5 objects to cache:
|
| for(int i=1;i<=5;i++){
|
| Fqn fqn = Fqn.fromString("/user/"+i);
| Node node = rootNode.addChild(fqn);
| node.put("id", ""+i);
| }
|
| while(true){
|
| //2. Query the first 3 objects so that they become the most recently used. This way
the remaining 2 nodes would be evicted
| for(int i=1;i<=3;i++){
| Fqn fqn = Fqn.fromString("/user/"+i);
| Node node = cache.getNode(fqn);
| }
|
| //3. Try to put 2 new.
| for(int i=0;i<2;i++){
| double random = Math.random();
| Fqn fqn = Fqn.fromString("/user/"+random);
| Node node = rootNode.addChild(fqn);
| node.put("id", "" + random);
| }
|
| //4. Print cache:
| System.out.println(cache.getChildrenNames("/user/"));
|
|
| //5. Sleep for some secs to visualize console
| Thread.currentThread().sleep(2000);
|
| }
2) xml config
<?xml version="1.0" encoding="UTF-8"?>
| <jbosscache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="urn:jboss:jbosscache-core:config:3.1">
|
| <transaction
transactionManagerLookupClass="org.jboss.cache.transaction.GenericTransactionManagerLookup"/>
|
| <eviction wakeUpInterval="
| 10000
| ">
|
| <default algorithmClass="org.jboss.cache.eviction.
| LRUAlgorithm
| " eventQueueSize="200000">
| <property name="maxNodes" value="5000" />
| <property name="timeToLive" value="1000000" />
| </default>
|
| <region name="/user">
| <property name="maxNodes" value="5" />
| <property name="timeToLive" value="1000" />
| </region>
|
| </eviction>
| </jbosscache>
3) Expected behavior:
Given that the specified max number of nodes equals 5, and only 3 of them are queried, I
expect that the remaining 2 (the ones that are not queried) are evicted (given the LRU
policy). However, I've identified the following problems when looking into the
console:
1) 2 of the 3 queried nodes are evicted (this means, 2 of the 3 most recent nodes were
evicted)
2) The cache size exceeds the specified constraint (it has more than 5 elements after
several iterations of the cycle)
3) The eviction therad is always executed every wakeUpInterval/2
Thank you very much for your time, I'll be eagerly waiting for your response.
Greetings,
Andres Pachon
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