With Drupal combo_field_storage module, we can write mongoDB enabled field storage to both MySQL and MongoDB, but the write speed of MySQl is slow. Here we make a non-blocking approach to support this feature.
Install mongodb module Install httprl module Install this module and done
https://drupal.org/node/2140647
- Support important writes to use blocking approach ? (is it required)
- Anything must get the result to take further action ? (Currently cannot find in combo_field_storage)