Hello,

If you don’t use tendril.wikimedia.org or dbtree.wikimedia.org, feel free to ignore this message.

As of today, tendril is now retired and the main page is replaced with a list of replacement for different services tendril used to provide:

• For checking out our dbtree and replication data:

• if you are in the NDA LDAP group, use Orchestrator

• otherwise, use the information page on noc.wikimedia.org. For more detail you can also check eqiad.json or codfw.json

• If you are looking for slow queries log, go to slow queries dashboard using our standard observability platform (logstash) (NDA required)

Tendril has been a great tool for us during the years, but unfortunately it is impossible to maintain with modern MariaDB versions (it uses TokuDB, which is no longer available on MariaDB after 10.1 and needs to be compiled separately) nor its webservice is compatible with modern php versions. Its database is still running on Stretch and on MariaDB 10.1 (which has not been supported for a year already) and it is having serious scalability issues. This would unblock us from removing a lot of legacy home-brew craft and replace them with more modern toolings such as orchestrator.

Orchestrator has been in place for a few months now, and provides us with a great way to see and (in the future) manage replication topologies. For now we are using it only for visualization purposes but in the future we’d like it to also help us to handle replication changes (it can be done from the UI or via CLI) and recover topologies automatically if they fail and involve masters or intermediate masters.

The slow queries dashboard in logstash offer multiple advantages over tendril. You can set the threshold to see slow queries that took longer to run. You can filter out code paths you’re not interested in or zoom in to relevenet code paths. You can limit it to write queries or read queries only. Also, it provides id of the request making the slow query, so you can cross check it with the rest of logstash or hadoop to identify problematic behavior. 

If you need it for the transition period, you can still access it in tendril-legacy.wikimedia.org. But it will be shut down in a month. You can follow the work of shutting down tendril in https://phabricator.wikimedia.org/T297605.

Thank you.