Change Details

Apologies, abusing the subscriber list and set of tags from T239900 to get some input on a question. `$wgLBFactoryConf['hostsByName']` presently contains hosts from both datacenters, duplicated across both `db-eqiad.php` and `db-codfw.php`. There's also a `hostsByName` hash in etcd, ready for use, but it contains only the local-datacenter DB servers. See for instance https://noc.wikimedia.org/dbconfig/eqiad.json Is there ever any reason that a Mediawiki in etcd would need to contact a DB server in codfw, or vice versa? As far as I can tell this should be impossible, since none of those hostnames are referenced elsewhere in `$wgLBFactoryConf`, which means that Mediawiki should have no idea which servers correspond to which sections, or have any reason to otherwise reference those extra entries appearing in `hostsByName`. But I wanted to make sure before enabling the use of `hostsByName` from etcd in production, and removing some hundreds of lines of PHP that are suffixed with `# do not remove or comment out`

Apologies, abusing the subscriber list and set of tags from T239900 to get some input on a question. `$wgLBFactoryConf['hostsByName']` presently contains hosts from both datacenters, duplicated across both `db-eqiad.php` and `db-codfw.php`. There's also a `hostsByName` hash in etcd, ready for use, but it contains only the local-datacenter DB servers. See for instance https://noc.wikimedia.org/dbconfig/eqiad.json Is there ever any reason that a Mediawiki in eqiad would need to contact a DB server in codfw, or vice versa? As far as I can tell this should be impossible, since none of those hostnames are referenced elsewhere in `$wgLBFactoryConf`, which means that Mediawiki should have no idea which servers correspond to which sections, or have any reason to otherwise reference those extra entries appearing in `hostsByName`. But I wanted to make sure before enabling the use of `hostsByName` from etcd in production, and removing some hundreds of lines of PHP that are suffixed with `# do not remove or comment out`

Apologies, abusing the subscriber list and set of tags from T239900 to get some input on a question. `$wgLBFactoryConf['hostsByName']` presently contains hosts from both datacenters, duplicated across both `db-eqiad.php` and `db-codfw.php`. There's also a `hostsByName` hash in etcd, ready for use, but it contains only the local-datacenter DB servers. See for instance https://noc.wikimedia.org/dbconfig/eqiad.json Is there ever any reason that a Mediawiki in etcdeqiad would need to contact a DB server in codfw, or vice versa? As far as I can tell this should be impossible, since none of those hostnames are referenced elsewhere in `$wgLBFactoryConf`, which means that Mediawiki should have no idea which servers correspond to which sections, or have any reason to otherwise reference those extra entries appearing in `hostsByName`. But I wanted to make sure before enabling the use of `hostsByName` from etcd in production, and removing some hundreds of lines of PHP that are suffixed with `# do not remove or comment out`