<a rel="license" href="http://creativecommons.org/licenses/by/3.0/"><img alt="Creative Commons License" style="border-width:0" src=" http://i.creativecommons.org/l/by/3.0/88x31.png" /></a><br />This work is licensed under a <a rel="license" href=" http://creativecommons.org/licenses/by/3.0/">Creative Commons Attribution 3.0 Unported License</a>. On May 1, 2013 8:49 PM, "Ryan Lane" rlane@wikimedia.org wrote:
On Wed, May 1, 2013 at 5:03 PM, Tim Landscheidt tim@tim-landscheidt.dewrote:
Hi,
at the office hour yesterday (cf. http://bots.wmflabs.org/~wm-bot/logs/%23wikimedia-office/20130430.txt):
| [...] | <Coren> multichill: The long story short; replicating | databases is happening soon (Within the month) | Replicating multiple copies of commons and wikidata | isn't going to happen that way; it needs to be built | into application logic or using federated tables. | Almost /all/ of the problems the TS have had with | replication were caused by that redundancy and | trying to keep it synced. | <multichill> Coren: So you're basically saying Toollabs is | useless for me | <Platonides> {{ref needed}} | <Coren> We're all more than happy to help you (and any other | maintainer) with adapting your tools to work in that | setup. | <scfc_de> Coren: In that case, Tools will not be able to | replace Toolserver. | <giftpfla1ze> what are federated tables btw? | <Ryan_Lane> AFAIK toolserver will also have this limitation | at some point | <scfc_de> Ryan_Lane: What do you mean? | [...]
There were never answers to this, so I bring it up here again:
How were "almost /all/ of the problems the TS have had with replication" "caused by that redundancy and trying to keep it synced"?
What limitation will the Toolserver have at some point?
As to #2: From what I've been told this has to do with future sharding plans for the databases, and due to a change in how we'll be doing replication. Of course, I've heard this in passing. For answers to both of these questions you'll need to talk to binasher and/or notpeter on IRC, as they are the ones doing the database work.
- Ryan
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