Hello folks,

What:

We'd like to schedule a maintenance window for all the stat machines:

stat1004.eqiad.wmnet
stat1005.eqiad.wmnet
stat1006.eqiad.wmnet
stat1007.eqiad.wmnet
stat1008.eqiad.wmnet

In this maintenance window, we will:

* Upgrade the conda-analytics debian package. This package is how we deploy Spark3. The upgrade will allow us to run JupyterHub and JupyterLab on top of it.
* Deploy new puppet configurations that will switch from running Jupyter on top of anaconda-wmf to running on top of conda-analytics.
  * This effectively upgrades our Jupyter deployment as follows:
     * Upgrades JupyterHub from 1.1.0 to 1.5.0.
     * Upgrades JupyterLab from 3.2.9 to 3.4.8.
     * Upgrades Spark on newly created conda environments from 2.4.4 to 3.1.2.
     * Upgrades wmfdata on newly created conda environments to 2.0.0. This version of wmfdata includes breaking changes.

IMPORTANT: After this maintenance window, you should expect the following:
*** JupyterHub and any existing JupyterLab processes including any running kernels, will be shut down, and will have to be restarted manually by the respective owners. ***
*** JupyterLab UI will have minor changes. ***
*** New conda environments created via JupyterHub will now be based off of conda-analytics and will utilize Spark3. ***
*** Existing conda environments based off of anaconda-wmf will continue to work, and continue to utilize Spark2. ***


Why:

As part of our effort to deprecate Spark2 and make Spark3 widely available, we are deprecating the use of anaconda-wmf and Spark2, in favor of conda-analytics and Spark3.
Note this is just deprecation, you will still be able to use your existing conda environments running on top of anaconda-wmf and Spark2.


When:

We are proposing the following window for these changes:

Wednesday 30 Nov 2022 12:30 to 13:30 UTC.
(7:30 AM ET / 4:30 AM PT)


More info:

Spark3 upgrade: https://wikitech.wikimedia.org/wiki/Analytics/Systems/Cluster/Spark/Migration_to_Spark_3
The old anaconda-wmf base conda environment: https://wikitech.wikimedia.org/wiki/Analytics/Systems/Conda
The new conda-analytics base conda environment: https://wikitech.wikimedia.org/wiki/Analytics/Systems/conda-analytics
wmfdata changes: https://github.com/wikimedia/wmfdata-python/blob/main/CHANGELOG.md


Please let us know if you have any questions or objections.

--

Xabriel J. Collazo Mojica (he/him, pronunciation)

Sr Software Engineer

Wikimedia Foundation