At the time of the eqiad -> codfw DC switch the average dispatch lag times for wikidata dropped from ~2.5 mins on average down to ~16 seconds.
We should investigate what exactly caused this.
Looking at the metrics of the dispatching script it appears that the total amount of time spent selecting clients dramatically dropped.
- different mwmaint hardware
- different db hardware
- different redis hardware
- some other db related difference
- something else?