Tuesday, December 22, 2009

How to contribute with Replication and Backup code

The MySQL Replication and Backup team is working with several community developers.

MySQL does a milestone release (roughly) every six months. To get patches included into a milestone release, it needs to be ready before the deadline for that milestone. All milestone releases are published, but not all will become GA-classified.

The below describes the process on how to get a contributed Replication or Backup patch included into a milestone release.
  1. Get acceptance of the idea. Each accepted patch needs to be thoroughly tested (by multiple teams in different ways) and we need to ensure that we can maintain it for many years. Due to this resource requirement, we can only accept a few patches per year (this number is increasing though, which is great). When your idea is accepted, you get an assigned "coach developer" that will help your patch through the procedure to get it included into a release.
  2. Get acceptance of patch. This includes multiple parts:
    • contributor agreement must be signed,
    • design must be accepted,
    • tests must be accepted, and
    • code must be accepted.
  3. Patch gets pushed into a team repository. The Replication and Backup team push the patch into the team repository. Some more testing is done. If there are problems with the patch, it can possibly be removed from the tree.
  4. Before the deadline for a milestone, the team tree gets merged into the release tree for that milestone. Release testing is done by the System QA and Server QA teams. If there are problems with the patch, it can possibly be removed from the tree.
  5. The milestone release is built from the milestone repository and is published on www.mysql.com. Some milestone releases will be marked as GA releases.
Before step 2 is completed, it is hard to know for which release it can be included into.

More information about how to contribute is available here:

If you have comments about this procedure or would like to contribute with Replication and Backup code, please let me know.

Thursday, May 7, 2009

New Replication Features talk

In a few minutes, we will present the new replication features of 5.1 and 6.0 at the MySQL University:

Walk-through of new 5.1 and 6.0 replication features

The talk is the same as was given at the MySQL User Conference 2009.

Very welcome to join the talk!

Friday, April 17, 2009

Feature Preview: Multi-threaded Slave

We have just published Andrei's first version of the multi-threaded slave as a preview release.

Currently, the master produce a load by concurrent multiple client connections while the single slave thread execute replication events one by one. In some scenarios, this causes the slave to lag behind the master.

With the multi-threaded slave work, the replication slave will scale on multi-core machines.

This is a very early preview with serious limitations. Even so, please feel free to try it out and let us know what you think.