Hi Kevin, [ To keep archives happy, it seems this thread got broken off of https://lists.wikimedia.org/pipermail/analytics/2015-February/003307.html ]
On Mon, Feb 09, 2015 at 09:55:46AM -0800, Kevin Leduc wrote:
> Christian, can we just point the geowiki code to a different database?
Simple repointing does not work. But migration should be trivial
enough [1] nonetheless.
However, IIRC geowiki is kept in “at some point we're scheduling to do
it right”-state since more than a year. It has always been postponed.
This database change might be a nice incentive for finally doing it.
Have fun,
Christian
[1] As depicted in the diagram [2] from my previous email, geowiki
uses s1-analytics-slave in two different ways.
1. As a source for wiki data.
(Top in the batch of the databases on the very left of the diagram)
For this use, repointing is sufficient.
2. As a database to store daily aggregates.
(Below the left-most grey rectangle)
The “erosen_*” tables in the “staging” database hold the daily
aggregates geowiki computes. Geowiki also generates the csvs using
those tables. As the “staging” database is not replicated between the
hosts, a plain repointing would at least cause data loss.
But migration should be as simple as:
* Copying the tables over from s1-analytics-slave to the new
database server.
* Making sure the “research” user has access from stat1003.
* Rerunning geowiki for the lost-data (due to copying).
[2] https://upload.wikimedia.org/wikipedia/commons/b/b0/Geowiki_workflow.png
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