| Krinkle added a comment. |
Earlier when I was investigating with Stas, performing the slow recentchanges api request with X-Wikimedia-Debug: log shows the following in Logstash:
[DEBUG] [DBConnection] Wikimedia\Rdbms\LoadBalancer::getReaderIndex: using server db2080 for group 'api'
Which indeed shows that it is using a dbhost from the "api" group instead of the "rc" group.
The actual query:
[DEBUG] [DBQuery]
SELECT rc_id,rc_timestamp, rc_namespace,rc_title,rc_cur_id, rc_type,rc_deleted, rc_this_oldid,rc_last_oldid FROM `recentchanges` WHERE (rc_timestamp>='20180914110000') AND rc_namespace IN ('0','120') AND rc_type IN ('0','1','3','6') ORDER BY rc_timestamp ASC,rc_id ASC LIMIT 101runtime: 27.811768054962 seconds
I do note that while I can reproduce maybe 8 of 10 times with the codfw mwdebug hosts, I could not on the eqiad mwdebug hosts.
Stas found the same when executing it from the command-line, that it is slow from mwmaint2001.codfw but normal from mwmaint1001.eqiad.
I haven't looked further, but I would assume that either means that in eqiad it is correctly picking the "rc" group, or that in eqiad the query is fast on dbhosts from the "api" group.
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