@Override
    public <T> T invokeAny(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit)
      throws InterruptedException, ExecutionException, TimeoutException {
      return null;
    }
Just to create in instance, this doesn't actually function.
hbase-client/src/test/java/org/apache/hadoop/hbase/client/TestBufferedMutatorParams.java