There is a low, but significant number of mediawiki errors on query execution with the above error:
```
Wikimedia\Rdbms\Database::close 10.192.32.168 2014 Commands out of sync; you can't run this command now (10.192.32.168) COMMIT
```
e.g.:
```
{
"_index": "logstash-2018.09.14",
"_type": "mediawiki",
"_id": "AWXX_3jKo1GdFyIETwgn",
"_version": 1,
"_score": null,
"_source": {
"server": "en.wikipedia.org",
"db_server": "10.192.32.168",
"wiki": "enwiki",
"channel": "DBQuery",
"type": "mediawiki",
"error": "Commands out of sync; you can't run this command now (10.192.32.168)",
"http_method": "GET",
"@version": 1,
"host": "mw2274",
"shard": "s1",
"sql1line": "COMMIT",
"fname": "Wikimedia\\Rdbms\\Database::close",
"errno": 2014,
"unique_id": "W5ulhArAMGAAALdEtv8AAAHQ",
"method": "Wikimedia\\Rdbms\\Database::makeQueryException",
"level": "ERROR",
"ip": "10.192.16.136",
"mwversion": "1.32.0-wmf.20",
"message": "Wikimedia\\Rdbms\\Database::close\t10.192.32.168\t2014\tCommands out of sync; you can't run this command now (10.192.32.168)\tCOMMIT",
"normalized_message": "{fname}\t{db_server}\t{errno}\t{error}\t{sql1line}",
"url": "/w/index.php?oldid=848654409&redirect=no",
"tags": [
"syslog",
"es",
"es"
],
"reqId": "W5ulhArAMGAAALdEtv8AAAHQ",
"referrer": null,
"@timestamp": "2018-09-14T12:12:48.000Z",
"db_name": "centralauth",
"db_user": "wikiuser"
},
"fields": {
"@timestamp": [
1536927168000
]
},
"sort": [
1536927168000
]
}
```
~~My guess is that a COMMIT is tried in a non-started transaction (or it is, but connection is lost)~~ See below T204346#4584159 for a proper analysis.
The commands seem to happen (at least) on the following url:
https://en.wikipedia.org/w/index.php?oldid=854160404
And indeed that doesn't seem to load for me.
First occurrence seemed to happen on 2018-09-11T12:27:17, before the dc switch.