Terracotta Discussion Forums

Hi,

I'm experimenting with EhCache version 1.7.0.

I have two processes, one writing objects and one listening for them with a CacheEventListener.

Both have identical ehcache.xml config files as follows:

Code:

 <cacheManagerPeerProviderFactory class="net.sf.ehcache.distribution.RMICacheManagerPeerProviderFactory"       properties="peerDiscovery=automatic,multicastGroupAddress=239.255.0.1,multicastGroupPort=4446,timeToLive=0" propertySeparator=","/>
 
 <cacheManagerPeerListenerFactory class="net.sf.ehcache.distribution.RMICacheManagerPeerListenerFactory"/>
     
 <cache name="myCache"
             maxElementsInMemory="100000"
             eternal="true"
             overflowToDisk="false">
 
         <cacheEventListenerFactory class="net.sf.ehcache.distribution.RMICacheReplicatorFactory"/>

However, the data in the cache is not being distributed between the two processes. I have run the EhCache Debugger and upped the log level. No matter whether or not my two servers are running, I always seem to get this from the debugger:

"FINE: 1 RMICachePeers bound in registry for RMI listener"

Then I continuously get these:
Cache: myCache Notifications received: 0 Elements in cache: 0

However, my process is continuously putting new objects into the cache - they just do not appear to be detected by either the debugger, or my listening process - its CacheEventListener doesn't get called and cache.getSize() returns 0.

Can anyone suggest what is wrong?

Thanks

Ok, you are not getting anything. If you were the notifications received would increment.

Try turning up net.sf.ehcache.distribution logging level to FINE and past that to this forum.

The most likely causes of trouble are:

1) something wrong with multicast. Try running both processes on the same box to rule out something blocking multicast.

2) Try ehcache 1.6.2. The debugger has not yet been released against 1.7. Not sure if it is the cause but we have not validated it yet.

Thanks for your reply.

I am running both processes on the same box.

I tried switching to version 1.6.2 of ehcache but I get the same problem.

Attached is the log from the debugger.

Thanks

So you are using "automatic" RMI, which does multicast behind the scenes. Have you checked whether multicast works?

Here is my ehcache.xml that works, using "manual" RMI:

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="ehcache.xsd">
<diskStore path="java.io.tmpdir"/>

<cacheManagerEventListenerFactory class="" properties=""/>

<cacheManagerPeerProviderFactory
class="net.sf.ehcache.distribution.RMICacheManagerPeerProviderFactory"
properties="peerDiscovery=manual,
rmiUrls=//server1:40000/tableColumn
|//server2:40000/tableColumn"
propertySeparator="," />
<cacheManagerPeerListenerFactory
class="net.sf.ehcache.distribution.RMICacheManagerPeerListenerFactory"
properties="hostName=server1,
port=40000,
socketTimeoutMillis=120000"
propertySeparator=","/>

<defaultCache
maxElementsInMemory="20000"
eternal="false"
timeToIdleSeconds="300"
timeToLiveSeconds="300"
overflowToDisk="true"
diskSpoolBufferSizeMB="50"
maxElementsOnDisk="10000000"
diskPersistent="false"
diskExpiryThreadIntervalSeconds="120"
memoryStoreEvictionPolicy="LRU"
/>
<cache name="tableColumn"
maxElementsInMemory="20000"
eternal="true"
timeToIdleSeconds="432000"
timeToLiveSeconds="432000"
overflowToDisk="true">
<cacheEventListenerFactory
class="net.sf.ehcache.distribution.RMICacheReplicatorFactory"/>
<bootstrapCacheLoaderFactory
class="net.sf.ehcache.distribution.RMIBootstrapCacheLoaderFactory"/>
</cache>
</ehcache>

The issue seems to be resolved.Please let know in case of more information.