https://bugzilla.wikimedia.org/show_bug.cgi?id=31177

--- Comment #2 from Brion Vibber <[email protected]> 2011-09-27 00:26:11 UTC 
---
One avenue we've looked at a bit is possible transitory ExternalStorage errors;
a failure to fetch a revision's text while doing MessageCache::loadFromDB()
would end up saving an empty cache entry, just as we see.

Aaron's unable to find any evidence in the server logs yet (should be some
notes in ExternalStoreDB debug log with the offending blob ids), but we need to
check logs for a few days back probably.

If it is that, this may help:
https://gist.github.com/1243845
(checks for text load failure when building the cache from DB and stores a
'!TOO BIG' entry which means 'go fetch on demand', which is better than a fake
entry)


Tim's also looking further into possible slave server inconsistencies etc and
doing a reset of the memcache entry...

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