public TShowTable4InformationSchemaResp showTables4InformationSchema() {
    try {
      return ((ShowTable4InformationSchemaResp)
              configManager.getConsensusManager().read(new ShowTable4InformationSchemaPlan()))
          .convertToTShowTable4InformationSchemaResp();
    } catch (final ConsensusException e) {
      LOGGER.warn("Failed in the read API executing the consensus layer due to: ", e);
      final TSStatus res = new TSStatus(TSStatusCode.EXECUTE_STATEMENT_ERROR.getStatusCode());
      res.setMessage(e.getMessage());
      return new TShowTable4InformationSchemaResp(res);
    }
  }
get all template set and pre-set info to sync to a registering dataNodes, the pre unset
template info won't be taken
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/manager/schema/ClusterSchemaManager.java