@Override
    public void throwOnMutate(FakeRSRpcServices rpcServices, ClientProtos.MutateRequest request)
      throws ServiceException {
      throwSomeExceptions(rpcServices, request.getRegion());
    }
Rotates through the possible cache clearing and non-cache clearing exceptions for requests.
hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestMetaCache.java