MessageIndexRebuild failing
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	Nikerabbit
	Jun 16 2012, 8:24 AM

Description

I have got multiple reports from WMF projects of the "pt-unknown-message" problem.

My new theory is that now it is caused by db replication lag, because WikiPageMessageGroup used DB_SLAVE to load the message definitions.

Version: unspecified
Severity: critical

Mentioned In: T95753: Translate extensions uses the master a lot on page views

• bzimport raised the priority of this task from to High.Nov 22 2014, 12:27 AM

• bzimport set Reference to bz37647.

Little bit more explanation:

Someone marks a page for translation
That causes writing new data to translate_sections
It also triggers message index recreation within the same request. Basically it iterates over all message groups, calling getDefinitions[1] to collect the message key, and build huge array of messagekey => message group id and storing it in some place.

[1] Failure happens here, because getDefinitions loads the sections from translate_sections using DB_SLAVE.

Maybe doing something like wfGetLB()->waitFor( wfGetLB()->getMasterPos() ) after writing the translate_sections ?

Please have a look at https://gerrit.wikimedia.org/r/11835
I can't test this myself

Assuming this is fixed. Please test and either reopen the bug or mark as verified.