@Override
  protected void rollbackState(MasterProcedureEnv env, ReopenTableRegionsState state)
    throws IOException, InterruptedException {
    throw new UnsupportedOperationException("unhandled state=" + state);
  }
At end of timeout, wake ourselves up so we run again.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/ReopenTableRegionsProcedure.java