I made several tests around this method... you could have eventually few instances created and imediatly destroyed during an initial ramp up, but after the initial load... and the ConcurrentHashMap aways gave enough protection on the Store. Well... But anyway I have created a new method synchronized createPageStore on the Chunk Branch which is aways used in places where I don't need concurrent calls over the same store. When we create the queue now, the pageStore will be also created. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4189272#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...