https://bugzilla.wikimedia.org/show_bug.cgi?id=69713
Bug ID: 69713
Summary: Trying to read old log entries times out initially;
both API and Special:Log
Product: MediaWiki
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: Logging
Assignee: [email protected]
Reporter: [email protected]
Web browser: ---
Mobile Platform: ---
I get "504 Gateway Time-out" (no other information, also looked in the page
source of that error page) on trying to get the upload log of Sep 30, 2013 at
the Commons:
https://commons.wikimedia.org/w/index.php?title=Special:Log&offset=20130930000000&limit=50&type=upload
Unsurprisingly, the API has the same problem:
https://commons.wikimedia.org/w/api.php?action=query&list=logevents&letype=upload&lestart=20130930000000&format=jsonfm
Even the API returns a bland "504 Gateway Time-out" HTML page.
Re-trying the timed-out query (either Special:Log or the API call) again may
then succeed, sometimes only after several re-tries. However, the answer still
takes very long to compute.
May be difficult to reproduce. It happened to me yesterday, until it suddenly
started to work. So I thought it was a spurious effect and did not yet file a
bug report. However, today exactly the same thing happened, so here's the bug
report.
Looks like something gets cached and takes very long getting cached, so the
first few attempts time out. But once the thing (whatever it is, a database
index?) is cached, subsequent queries work, also for other dates in the
vicinity of the initial date. That would at least explain the behavior I'm
seeing. I presume the cached data gets evicted from the cache after some time,
so re-trying the query the next day has to re-cache it and then initially times
out again.
Even when it finally works, it's often rather sluggish to return results.
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