docs

docs/deployment/engine_on_kubernetes.md

@@ -54,6 +54,27 @@ directory from growing indefinitely. Since Kyuubi v1.11.0, you can configure `sp
 placeholders `{{YEAR}}`, `{{MONTH}}` and `{{DAY}}`, and enable `kyuubi.kubernetes.spark.autoCreateFileUploadPath.enabled`
 to let Kyuubi server create the directory with 777 permission automatically before submitting Spark application.
 
+Note that, Spark would create sub dir `s"spark-upload-${UUID.randomUUID()}"` under the `spark.kubernetes.file.upload.path`
+for each uploading, the administer still needs to clean up the staging directory periodically.
+
+For example, the user can configure the below configurations in `kyuubi-defaults.conf` to enable monthly rolling support
+for `spark.kubernetes.file.upload.path`
+
+```
+kyuubi.kubernetes.spark.autoCreateFileUploadPath.enabled=true
+spark.kubernetes.file.upload.path=hdfs://hadoop-cluster/spark-upload-{{YEAR}}{{MONTH}}
+```
+
+and the staging files would be like
+
+```
+hdfs://hadoop-cluster/spark-upload-202412/spark-upload-f2b71340-dc1d-4940-89e2-c5fc31614eb4
+hdfs://hadoop-cluster/spark-upload-202412/spark-upload-173a8653-4d3e-48c0-b8ab-b7f92ae582d6
+hdfs://hadoop-cluster/spark-upload-202501/spark-upload-3b22710f-a4a0-40bb-a3a8-16e481038a63
+```
+
+then the administer can safely delete the `hdfs://hadoop-cluster/spark-upload-202412` after 20250101.
+
 ### Docker Image
 
 Spark ships a `./bin/docker-image-tool.sh` script to build and publish the Docker images for running Spark applications on Kubernetes.

kyuubi-server/src/main/scala/org/apache/kyuubi/engine/spark/SparkProcessBuilder.scala

@@ -338,7 +338,7 @@ class SparkProcessBuilder(
 
   def isK8sClusterMode: Boolean = {
     clusterManager().exists(cm => cm.toLowerCase(Locale.ROOT).startsWith("k8s")) &&
-      deployMode().exists(_.toLowerCase(Locale.ROOT) == "cluster")
+    deployMode().exists(_.toLowerCase(Locale.ROOT) == "cluster")
   }
 
   def kubernetesContext(): Option[String] = {