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Add docs on appending to extraClassPath #772

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f580952
Add docs on appending to extraClassPath
Maleware Sep 11, 2026
431ba62
remove the needless
Maleware Sep 11, 2026
8457672
Merge branch 'main' into fix/add-docs-to-override-extraClassPath-prop…
Maleware Sep 11, 2026
e7b2707
Merge branch 'main' into fix/add-docs-to-override-extraClassPath-prop…
Maleware Sep 11, 2026
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19 changes: 18 additions & 1 deletion docs/modules/spark-k8s/pages/usage-guide/overrides.adoc
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Expand Up @@ -146,7 +146,6 @@ spec:
...
----


== Pod overrides

The Spark operator also supports Pod overrides, allowing you to override any property that you can set on a Kubernetes Pod.
Expand All @@ -157,6 +156,24 @@ Read the xref:concepts:overrides.adoc#pod-overrides[Pod overrides documentation]
Stackable operators automatically determine the set of needed JVM arguments, such as memory settings or trust- and keystores.
Using JVM argument overrides you can configure the JVM arguments xref:concepts:overrides.adoc#jvm-argument-overrides[according to the concepts page].

=== Overriding `extraClassPath`

The current implementation of `extraClassPath` overrides is a replace. Thus if you want to override `extraClassPath` you will need to append to the already set defaults you might need e.g. for `spark-connect`:

[source,yaml]
----
---
spec:
sparkImage:
productVersion: 4.1.2
sparkConf:
"spark.driver.extraClassPath": "/stackable/spark/extra-jars/*:/stackable/spark/connect/spark-connect-4.1.2.jar:/mydependencies/my.jar" #<1>
"spark.executor.extraClassPath": "/stackable/spark/extra-jars/*:/stackable/spark/connect/spark-connect-4.1.2.jar:/mydependencies/my.jar"
----
<1> First two entries are defaults set by the operator when using `spark-connect`, the last one is user specific.

Omitting the defaults set by the operator leads to a override and thus to incomplete `extraClassPath`.

=== Spark application

WARNING: Please note that you can currently not configure the JVM arguments of the spark-submit call, only on the drivers and executors.
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