[Engineering] Analytics Hadoop cluster offline for maintenance on Wed Apr 17th at 15:00 CET

[Luca Toscano]

Hi everybody,

the Analytics team is planning to upgrade the Hadoop cluster to CDH 5.16.1
(changelog in https://phabricator.wikimedia.org/T218343) on Wed Apr 17th at
15:00 CET. All services (HDFS, Hive, Oozie, Notebooks, etc..) will be
unavailable for one hour if everything goes according to plan, but please
account at least two if you need to schedule important work so any
unexpected issue will less likely affect you.

If this timeline impacts something really important that you have planned
or scheduled please let us know (via the above task or on IRC -
#wikimedia-analytics) and we'll re-schedule the maintenance accordingly.

Thanks!

Luca (on behalf of the Analytics team)
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