@Override
    public RpcScheduler create(Configuration conf, PriorityFunction priority, Abortable server) {
      final RpcScheduler delegate = super.create(conf, priority, server);
      return new SpyingRpcScheduler(delegate);
    }
Tests whether maximum of masters system time versus RSs local system time is used
hbase-server/src/test/java/org/apache/hadoop/hbase/TestMetaTableAccessor.java