});
interceptor.awaitCommandBlock();
final AtomicReference<GroupKey> keyToActivate = new AtomicReference<>(null);
PersistenceManager persistenceManager = TestingUtil.extractComponent(extractTargetCache(testCache), PersistenceManager.class);
persistenceManager.processOnAllStores(KeyFilter.LOAD_ALL_FILTER, new AdvancedCacheLoader.CacheLoaderTask() {
@Override
public void processEntry(MarshalledEntry marshalledEntry, AdvancedCacheLoader.TaskContext taskContext) throws InterruptedException {
keyToActivate.compareAndSet(null, (GroupKey) marshalledEntry.getKey());
taskContext.stop();
}