(This is a tracker of ISPN-4842 for JDG) Description: A user is testing 500 nodes cluster with 500 dist caches defined, and plans to expand it to 3000 caches. Infinispan manages consistent hash per cache, uses a JGroups channel per cache and uses several threads per cache. It gives significant overhead with this large size cluster. When tested with this size, Infinispan easily exhausted all threads in the thread pools and deadlocks, and requires several thousands threads to handle massive JOIN requests - the coord receives 499 * 3000 JOIN requests. It would be great if we can share the consistent hash and resources between caches. For example, define a "master" dist cache and allow other caches to refer to the master cache for resource sharing.