private void preSplitRegionAfterMETA(final MasterProcedureEnv env)
    throws IOException, InterruptedException {
    final MasterCoprocessorHost cpHost = env.getMasterCoprocessorHost();
    if (cpHost != null) {
      cpHost.preSplitAfterMETAAction(getUser());
    }
  }
Pre split region actions after the Point-of-No-Return step
@param env MasterProcedureEnv
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/SplitTableRegionProcedure.java