chore: Remove version 3.4.2, update upgrade docs

CHANGELOG.md

@@ -56,6 +56,10 @@ All notable changes to this project will be documented in this file.
   datanodes. It was previously raised for journalnodes, even though its text refers to datanode
   replicas, and never for datanodes ([#830]).
 
+### Removed
+
+- Remove support for HDFS `3.4.2` ([#838]).
+
 [#801]: https://github.com/stackabletech/hdfs-operator/pull/801
 [#806]: https://github.com/stackabletech/hdfs-operator/pull/806
 [#810]: https://github.com/stackabletech/hdfs-operator/pull/810
@@ -69,6 +73,7 @@ All notable changes to this project will be documented in this file.
 [#831]: https://github.com/stackabletech/hdfs-operator/pull/831
 [#833]: https://github.com/stackabletech/hdfs-operator/pull/833
 [#835]: https://github.com/stackabletech/hdfs-operator/pull/835
+[#838]: https://github.com/stackabletech/hdfs-operator/pull/838
 [#839]: https://github.com/stackabletech/hdfs-operator/pull/839
 
 ## [26.7.0] - 2026-07-21

docs/modules/hdfs/pages/usage-guide/upgrading.adoc

@@ -4,12 +4,12 @@
 IMPORTANT: HDFS upgrades are experimental, and details may change at any time.
 
 HDFS currently requires a manual process to upgrade.
-This guide takes you through an example case, upgrading an example cluster (from our xref:getting_started/index.adoc[Getting Started] guide) from HDFS 3.3.6 to 3.4.2.
+This guide takes you through an example case, upgrading an example cluster (from our xref:getting_started/index.adoc[Getting Started] guide) from HDFS 3.4.3 to 3.5.0.
 
 == Preparing for the worst
 
 Upgrades can fail, and it is important to prepare for when that happens.
-Apache HDFS supports https://hadoop.apache.org/docs/r3.4.2/hadoop-project-dist/hadoop-hdfs/HdfsRollingUpgrade.html#Downgrade_and_Rollback[two ways to revert an upgrade]:
+Apache HDFS supports https://hadoop.apache.org/docs/r3.5.0/hadoop-project-dist/hadoop-hdfs/HdfsRollingUpgrade.html#Downgrade_and_Rollback[two ways to revert an upgrade]:
 
 Rollback:: Reverts all user data to the pre-upgrade state. Requires taking the cluster offline.
 Downgrade:: Downgrades the HDFS software but preserves all changes made by users. Can be performed as a rolling change, keeping the cluster online.
@@ -20,7 +20,7 @@ In order to downgrade, revert the `.spec.image.productVersion` field, and then p
 
 [source,shell]
 ----
-$ kubectl patch hdfs/simple-hdfs --patch '{"spec": {"image": {"productVersion": "3.3.6"}}}' --type=merge
+$ kubectl patch hdfs/simple-hdfs --patch '{"spec": {"image": {"productVersion": "3.4.3"}}}' --type=merge
 hdfscluster.hdfs.stackable.tech/simple-hdfs patched
 ----
 
@@ -69,7 +69,7 @@ Once HDFS is ready to upgrade, the HdfsCluster can be updated with the new produ
 
 [source,shell]
 ----
-$ kubectl patch hdfs/simple-hdfs --patch '{"spec": {"image": {"productVersion": "3.4.2"}}}' --type=merge
+$ kubectl patch hdfs/simple-hdfs --patch '{"spec": {"image": {"productVersion": "3.5.0"}}}' --type=merge
 hdfscluster.hdfs.stackable.tech/simple-hdfs patched
 ----
 
@@ -103,7 +103,7 @@ Finally, mark the cluster as upgraded:
 
 [source,shell]
 ----
-$ kubectl patch hdfs/simple-hdfs --subresource=status --patch '{"status": {"deployedProductVersion": "3.4.2"}}' --type=merge
+$ kubectl patch hdfs/simple-hdfs --subresource=status --patch '{"status": {"deployedProductVersion": "3.5.0"}}' --type=merge
 hdfscluster.hdfs.stackable.tech/simple-hdfs patched
 ----
 

docs/modules/hdfs/partials/supported-versions.adoc

@@ -4,4 +4,3 @@
 
 - 3.5.0 (LTS)
 - 3.4.3
-- 3.4.2 (deprecated)

tests/test-definition.yaml

@@ -2,7 +2,6 @@
 dimensions:
   - name: hadoop
     values:
-      - 3.4.2
       - 3.4.3
       - 3.5.0
       # To use a custom image, add a comma and the full name after the product version