public void postSetSplitOrMergeEnabled(final boolean newValue, final MasterSwitchType switchType)
    throws IOException {
    execOperation(coprocEnvironments.isEmpty() ? null : new MasterObserverOperation() {
      @Override
      public void call(MasterObserver observer) throws IOException {
        observer.postSetSplitOrMergeEnabled(this, newValue, switchType);
      }
    });
  }
@return An instance of MasterServices, an object NOT for general user-space Coprocessor
        consumption.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterCoprocessorHost.java