Hi Serg, And here is the patch for MWL#132, TC plugin. The patch is fairly short, as most of the real code changes are included in MWL#116. This patch is mainly about introducing a new plugin interface for transaction coordinators, and making the three existing TCs in log.cc into built-in plugins. My main motivation for this work was Galera, but when I discussed with them at the Istanbul meeting, I learned that they are not so interested in internal 2-phase commit (instead they download a complete database snapshot at node recovery after a node crash). So now I do not have an example of an external TC plugin implementation. My idea is to implement the MWL#120: stacked event generators. I could then use this to implement a simple TC example that does (very) basic synchroneous replication (eg. maybe insert-only with little error handling or something). This could be a nice example of how to use the facilities that TC plugins provide for controlling the commit process etc. So I would like your opinion as to whether this should be pushed to 5.3 now or wait for MWL#120 (assuming you think it can be made suitable for pushing at all, of course :-). - Kristian.