@Override
  public String toString() {
    return "NotifyRegionMigrationProcedure{"
        + "regionId="
        + regionId
        + ", isStart="
        + isStart
        + '}';
  }
A procedure that notifies all DNs of the ongoing region migration procedure.
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/procedure/impl/region/NotifyRegionMigrationProcedure.java