https://bugzilla.wikimedia.org/show_bug.cgi?id=17896
Summary: Failover/fallback to internal storage when
$wgDefaultExternalStore external storage clusters are
all broken
Product: MediaWiki
Version: unspecified
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: Normal
Component: Database
AssignedTo: [email protected]
ReportedBy: [email protected]
We had a ~30 minute outage where pages couldn't be saved on en.wikipedia.org
today, because the blob tables on cluster20/cluster21 had reached the default
MyISAM 1-million row limit.
While the databases are being rebuilt with a raised limit, we restored write
capability by switching off $wgDefaultExternalStore for enwiki, so text entries
are temporarily being saved straight into the 'text' table.
It would probably make a lot of sense if we could do this automatically --
instead of breaking the site, fall back to an acceptable short-term alternative
and throw big fat alerts for us to go fix the ES parts.
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