public TDataNodeLocation getTriggerLocation(String triggerName) {
    TriggerInformation triggerInformation = triggerTable.get(triggerName);
    return triggerInformation == null ? null : triggerInformation.getDataNodeLocation();
  }
This Class used to save the information of Triggers and implements methods of manipulate it.
iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/trigger/TriggerTable.java