@Override
  public int hashCode() {
    return Objects.hash(this.removedDataNodes, this.regionMigrationPlans);
  }
Used to keep procedure lock even when the procedure is yielded or suspended.

@param env env
@return true if hold the lock
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/procedure/impl/node/RemoveDataNodesProcedure.java