Getting a massive amount of information from data storage to be displayed is where most of the activity happens in OpenStack. The two activities of reading data and writing (creating, updating and deleting) data are fundamentally different.
The optimization for these two opposite database activities can be done by physically separating the databases that service these two different activities. All the writes go to database servers, which then replicates the written data to the database server(s) dedicated to servicing the reads. Currently, AFAIK, many OpenStack deployment in production try to take advantage of MySQL (includes Percona or MariaDB) multi-master Galera cluster. It is possible to design and implement a read/write separation schema for such a DB cluster. Actually, OpenStack has a method for read scalability via defining master_connection and slave_connection in configuration, but this method lacks of flexibility due to deciding master or slave in the logical context(code). It's not transparent for application developer. As a result, it is not widely used in all the OpenStack projects. So, I'd like to propose a transparent read/write separation method for oslo.db that every project may happily takes advantage of it without any code modification. Moreover, I'd like to put it in the mailing list in advance to make sure it is acceptable for oslo.db. I'd appreciate any comments. br. Li Ma _______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
