as part of https://phabricator.wikimedia.org/T168414 the Analytics team needs to execute a lot of alter tables to the log database to be able to complete the work of data purging/sanitization. The plan is to stop the Eventlogging Mysql Consumer on eventlog1001 tomorrow Jan 03 during the EU morning, and keep it stopped until all the work is done. We estimate that this will require 2/3 days, so this means that data will not be replicated on the analytics-slave (db1108) during this timeframe. Event Logging will keep working as expected, the only thing that will be stopped is inserting new data on db1107.

Please follow up with me (elukey on IRC) or with the Analytics team if this maintenance affects a important work that you are doing, so we'll be able to decide together a better date.

Thanks a lot!

Luca (on behalf of the Analytics team)