@Override
    public void removeEventExecution(EventExecution eventExecution) {
        try {
            recordCassandraDaoEventRequests("removeEventExecution", eventExecution.getEvent());
            session.execute(
                    deleteEventExecutionStatement.bind(
                            eventExecution.getMessageId(),
                            eventExecution.getName(),
                            eventExecution.getId()));
        } catch (DriverException e) {
            Monitors.error(CLASS_NAME, "removeEventExecution");
            String errorMsg =
                    String.format(
                            "Failed to remove event execution for event: %s, handler: %s",
                            eventExecution.getEvent(), eventExecution.getName());
            LOGGER.error(errorMsg, e);
            throw new TransientException(errorMsg);
        }
    }
This is a dummy implementation and this feature is not implemented for Cassandra backed
Conductor
cassandra-persistence/src/main/java/com/netflix/conductor/cassandra/dao/CassandraExecutionDAO.java