Hi everybody,

I am going to do some maintenance on the Hadoop cluster tomorrow Wed 23rd that will require some quiet time for TLS certificate upgrades (we use it to encrypt data for various daemons, like Yarn NodeManagers and HDFS Journalnodes). With quiet time I mean no Yarn jobs running on the cluster and HDFS read-only mode, hopefully lasting 30/60 minutes maximum.

More info in https://phabricator.wikimedia.org/T253957

If this impacts some important work please let me know it in the task and I'll reschedule :)

Luca (on behalf of the Analytics team)