cache2.put("/1/2/3", null);
cache=createCache(TreeCache.REPL_ASYNC, IsolationLevel.SERIALIZABLE);
root=cache.getRoot();
root.acquireAll(owner, 2000, DataNode.LOCK_TYPE_READ);
root.releaseAll(owner);
assertEquals(0, cache.getNumberOfLocksHeld());
root.acquireAll(owner, 2000, DataNode.LOCK_TYPE_WRITE);