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sbernauer merged 2 commits into from
Aug 13, 2026
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docs: Document PDBs for controllers #1004

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docs: Document PDBs for controllers
sbernauer Aug 13, 2026
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Update docs/modules/kafka/pages/usage-guide/operations/pod-disruption…
sbernauer Aug 13, 2026
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8 changes: 7 additions & 1 deletion docs/modules/kafka/pages/usage-guide/operations/pod-disruptions.adoc
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Expand Up @@ -6,5 +6,11 @@ You can configure the permitted Pod disruptions for Kafka nodes as described in
Unless you configure something else or disable the default PodDisruptionBudgets (PDBs), the operator writes the following PDBs:

== Brokers
Allow only a single Broker to be offline at any given time, regardless of the number of replicas or `roleGroups`.

Only a single Broker is allowed to be offline at any given time, regardless of the number of replicas or roleGroups.
This is because we can not make any assumptions about topic replication factors.

== KRaft controllers

Only a single Controller is allowed to be offline at any given time, regardless of the number of replicas or roleGroups.
This is because they build a quorum for metadata.
4 changes: 3 additions & 1 deletion rust/operator-binary/src/controller/build/resource/pdb.rs
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Expand Up @@ -40,6 +40,8 @@ fn max_unavailable_brokers() -> u16 {
}

fn max_unavailable_controllers() -> u16 {
// TODO: what do we want here?
// Controllers build a quorum for metadata stuff, so fall below the "Multiple replicas to
// increase availability" category. We basically treat them in the same way we treat ZooKeeper
// nodes.
1
}
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