private void rollbackFromDropOnConfigNodes(ConfigNodeProcedureEnv env) {
    LOGGER.info("DropPipePluginProcedure: rollbackFromDropOnConfigNodes({})", pluginName);

    // do nothing but wait for rolling back to the previous state: DROP_ON_DATA_NODES
    // TODO: we should drop the pipe plugin on config nodes properly with RuntimeCoordinator's help
  }
This class extends {@link AbstractNodeProcedure} to make sure that when a {@link
DropPipePluginProcedure} is executed, the {@link AddConfigNodeProcedure}, {@link
RemoveConfigNodeProcedure} or {@link RemoveDataNodesProcedure} will not be executed at the same
time.
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/procedure/impl/pipe/plugin/DropPipePluginProcedure.java