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---
prelude: |
This is expected to be the last 3.x release of Zuul (barring any
unanticpated bugfix releases).
The next release of Zuul, 4.0.0, will require the following
deployment changes:
* TLS ZooKeeper connections
* Network connectivity from all components to ZooKeeper
* A SQL database
These features are supported now, so it is important that you take
this time to :ref:`switch your ZooKeeper connection to use
TLS<zk-encrypted-connections>`, and :ref:`configure a SQL
connection<sql-driver>`. Even though only some Zuul components
connect to ZooKeeper today, you should ensure that the
``[zookeeper]`` section is present in ``zuul.conf`` for all
components, and that they have network connectivity to the ZooKeeper
servers. Doing so will make the upgrade to 4.0.0 seamless.
These changes are in support of ongoing work to enable multiple
scheduler processes for scaling and availability. After the 4.0.0
release, it is anticipated that further upgrades to Zuul made in
support of this work will be done with minimal disruption in the
course of normal releases.
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