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http://www.jahia.net/jira/browse/JAHIA-1689?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Serge Huber updated JAHIA-1689:
-------------------------------
Original Estimate: 4 days
Remaining Estimate: 4 days
> When caches are too big and get flushed : cache coherency in cluster is no
> longer valid !
> -----------------------------------------------------------------------------------------
>
> Key: JAHIA-1689
> URL: http://www.jahia.net/jira/browse/JAHIA-1689
> Project: Jahia Web Content Management Server (WCMS)
> Issue Type: Bug
> Components: Load Balancing
> Affects Versions: WCM 5.0, WCM 5.0 SP1
> Reporter: Serge Huber
> Assignee: Serge Huber
> Priority: Major
> Fix For: WCM 6.0 (Andromeda)
>
> Original Estimate: 4 days
> Remaining Estimate: 4 days
>
> Currently we use the following algorithm to know if we must send an
> invalidation message through the cluster :
> public void put(Object key, String[] groups, Object value) {
> boolean newEntry = true;
> if (super.get(key) != null) {
> newEntry = false;
> }
> super.put(key, groups, value);
> if (!newEntry) {
> clusterService.sendMessage(new ClusterMessage(new
> ClusterCacheMessage(getName(), ClusterCacheMessage.INVALIDATEENTRY_EVENT,
> key, null)));
> }
> }
> This works fine when starting up Jahia, but doesn't work at all when we have
> reached a cache limit and elements were flushed from memory. What will happen
> in this case is that the object will be seen as a "newEntry" and the
> invalidation message will not be sent, although it is perfectly possible that
> other nodes might have loaded this object.
> So basically when memory becomes tight, we are no longer guaranteeing cluster
> integrity !
> When fixing this issue, we must be very careful, because we cannot signal all
> loads, otherwise Jahia servers will always flush each other all the time.
> Ideally we need to make a difference between a "reload" and a actual value
> change, and this for all nodes in the cluster.
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