From 5d134a0a95fc414ae75a2c953e63317ccaf1f536 Mon Sep 17 00:00:00 2001
From: Gyorgy Gal <27883675+gyogal@users.noreply.github.com>
Date: Mon, 14 Sep 2026 20:13:45 -0400
Subject: [PATCH] [LIVY-1072][FOLLOWUP] Fix Scala 2.13 compile error in
 SparkKubernetesApp

`KubernetesExtensions.getApplicationReport` failed to compile under
Scala 2.13 (the default build): `client.pods...list.getItems.asScala`
returns `scala.collection.mutable.Buffer`, but the enclosing `val
executors: Seq[Pod]` requires `scala.collection.immutable.Seq` (the 2.13
default for the unqualified `Seq` alias). Scala 2.12 allowed the
implicit widening; 2.13 does not.

Adds `.toSeq`, matching the same conversion already used a few lines
above for the driver-pod lookup.

`mvn install -pl core/scala-2.13,server -am -DskipTests` failed with
this exact type-mismatch error before the fix and succeeds after it.

Generated-by: Claude Code (Sonnet 5)
---
 .../main/scala/org/apache/livy/utils/SparkKubernetesApp.scala   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/server/src/main/scala/org/apache/livy/utils/SparkKubernetesApp.scala b/server/src/main/scala/org/apache/livy/utils/SparkKubernetesApp.scala
index bb8eb291b..fec93ca4e 100644
--- a/server/src/main/scala/org/apache/livy/utils/SparkKubernetesApp.scala
+++ b/server/src/main/scala/org/apache/livy/utils/SparkKubernetesApp.scala
@@ -742,7 +742,7 @@ private[utils] object KubernetesExtensions {
               appTagLabel -> app.getApplicationTag,
               SPARK_ROLE_LABEL -> SPARK_ROLE_EXECUTOR
             ).asJava)
-            .list.getItems.asScala
+            .list.getItems.asScala.toSeq
         } else {
           Seq.empty
         }