jcrespo added a comment.
> The move would likely require some changes to the Wikibase code Could you clarify why? As all other hosts seem to be ok with wikibase server for wikidata being on a separate database? Does MCR use wikibase differently or is it something else? Maybe having 2 wikibase services to use? Note again we notified of this need months in advance during planning phase, as new features require usually extra resources. > Wikibase-specific tables there is wbc_changes, and maybe other wikibase client tables- we don't have a problem with those, as those exist locally on all (wikidata-enabled) wikis. The ones we are worried about are the wikibase server ones (aka the equivalent of s8 on s4). I am not sure we should wait for the refactoring, but as long as the tables on s4 are empty or almost empty (with I think a single row on wb_id_counters), we are flexible. What we don't want is lots of data there that later is more complex to migrate away (we are assuming there will be a large amount of updates there when SDC is at full steam). A few hosts were budgeted for the split for FY2019-2020, we are not in a rush, but it would be nice to have some planning in place for next fiscal year so there are no unexpected delays, specially given persistence team is at 50% capacity ATM. TASK DETAIL https://phabricator.wikimedia.org/T68108 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: jcrespo Cc: Ladsgroup, MarkTraceur, WMDE-leszek, jcrespo, Marostegui, AfroThundr3007730, Stashbot, _jensen, SandraF_WMF, Ramsey-WMF, CCicalese_WMF, PokestarFan, Saerdnaer, Juandev, Elitre, Wesalius, Zppix, NMaia, Mattias_Ostmar-WMSE, Sadads, Poyekhali, -jem-, Deskana, Tfinc, Smalyshev, Jheald, LikeLifer, Yann, intracer, Spinster, Orofarne, Filceolaire, MZMcBride, bzimport, TheDJ, zhuyifei1999, DixonD, Bugreporter, RP88, Aklapper, Matanya, waldyrious, El_Grafo, Daniel_Mietchen, Jdforrester-WMF, GPHemsley, Bene, Legoktm, Nemo_bis, Lokal_Profil, Tobi_WMDE_SW, He7d3r, Petrb, Gilles, jayvdb, Kelson, Steinsplitter, JeroenDeDauw, iecetcwcpggwqpgciazwvzpfjpwomjxn, revi, JanZerebecki, JeanFred, Ricordisamoa, Snowolf, Keegan, Rillke, Bawolff, Fabrice_Florin, Multichill, Liuxinyu970226, Ainali, Tgr, Lydia_Pintscher, jeremyb, Stryn, Ltrlg, daniel, Dereckson, JohnLewis, darthmon_wmde, Nandana, JKSTNK, Lahi, PDrouin-WMF, Gq86, E1presidente, Cparle, Anooprao, GoranSMilovanovic, QZanden, Tramullas, Acer, V4switch, LawExplorer, Salgo60, Silverfish, rosalieper, Taiwania_Justo, Susannaanas, Wong128hk, Jane023, Wikidata-bugs, Base, matthiasmullie, aude, Dinoguy1000, Raymond, Mbch331
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