diff --git a/rucat_state_monitor/src/resource_manager/k8s_client.rs b/rucat_state_monitor/src/resource_manager/k8s_client.rs
index f30fcab..f8985f7 100644
--- a/rucat_state_monitor/src/resource_manager/k8s_client.rs
+++ b/rucat_state_monitor/src/resource_manager/k8s_client.rs
@@ -3,10 +3,14 @@ use ::std::{borrow::Cow, collections::BTreeMap};
 use ::k8s_openapi::api::core::v1::{Pod, Service};
 use ::kube::{api::PostParams, Api, Client};
 use ::rucat_common::{
-    anyhow::anyhow, engine::{
+    anyhow::anyhow,
+    engine::{
         get_spark_app_id, get_spark_driver_name, get_spark_service_name, EngineConfigs, EngineId,
         EngineState,
-    }, error::{Result, RucatError}, serde_json::{self, json}, tracing::{debug, warn}
+    },
+    error::{Result, RucatError},
+    serde_json::{self, json},
+    tracing::{debug, warn},
 };
 
 use super::{ResourceManager, ResourceState};
@@ -79,51 +83,65 @@ impl K8sClient {
     const SPARK_SERVICE_SELECTOR: &str = "rucat-engine-selector";
 
     // convert engine configurations to Spark submit format
-    fn to_spark_submit_format(id: &EngineId, user_configs: &EngineConfigs) -> Result<Vec<Cow<'static, str>>> {
+    fn to_spark_submit_format(
+        id: &EngineId,
+        user_configs: &EngineConfigs,
+    ) -> Result<Vec<Cow<'static, str>>> {
         // Preset configurations for Spark on Kubernetes.
         // Users are not allowed to set these configurations.
         // make the map ordered for easier testing
         let preset_configs = BTreeMap::from([
             (Cow::Borrowed("spark.app.id"), get_spark_app_id(id)),
-            (Cow::Borrowed("spark.driver.extraJavaOptions"), Cow::Borrowed("-Divy.cache.dir=/tmp -Divy.home=/tmp")),
-            (Cow::Borrowed("spark.driver.host"), get_spark_service_name(id)),
-            (Cow::Borrowed("spark.kubernetes.container.image"), Cow::Borrowed("apache/spark:3.5.3")),
-            (Cow::Borrowed("spark.kubernetes.driver.pod.name"), get_spark_driver_name(id)),
-            (Cow::Borrowed("spark.kubernetes.executor.podNamePrefix"), get_spark_app_id(id)),
+            (
+                Cow::Borrowed("spark.driver.extraJavaOptions"),
+                Cow::Borrowed("-Divy.cache.dir=/tmp -Divy.home=/tmp"),
+            ),
+            (
+                Cow::Borrowed("spark.driver.host"),
+                get_spark_service_name(id),
+            ),
+            (
+                Cow::Borrowed("spark.kubernetes.container.image"),
+                Cow::Borrowed("apache/spark:3.5.3"),
+            ),
+            (
+                Cow::Borrowed("spark.kubernetes.driver.pod.name"),
+                get_spark_driver_name(id),
+            ),
+            (
+                Cow::Borrowed("spark.kubernetes.executor.podNamePrefix"),
+                get_spark_app_id(id),
+            ),
         ]);
 
-        match preset_configs.keys()
-            .filter(|k| user_configs.contains_key(*k))
-            .next() {
-                Some(key) => {
-                    Err(RucatError::not_allowed(anyhow!(
-                        "The config {} is not allowed as it is reserved.",
-                        key
-                    )))
-                }
-                None => {
-                    Ok([
-                        Cow::Borrowed("--master"),
-                        Cow::Borrowed("k8s://https://kubernetes:443"),
-                        Cow::Borrowed("--deploy-mode"),
-                        Cow::Borrowed("client"),
-                        Cow::Borrowed("--packages"),
-                        Cow::Borrowed("org.apache.spark:spark-connect_2.12:3.5.3"),
-                    ]
+        match preset_configs
+            .keys()
+            .find(|k| user_configs.contains_key(*k))
+        {
+            Some(key) => Err(RucatError::not_allowed(anyhow!(
+                "The config {} is not allowed as it is reserved.",
+                key
+            ))),
+            None => Ok([
+                Cow::Borrowed("--master"),
+                Cow::Borrowed("k8s://https://kubernetes:443"),
+                Cow::Borrowed("--deploy-mode"),
+                Cow::Borrowed("client"),
+                Cow::Borrowed("--packages"),
+                Cow::Borrowed("org.apache.spark:spark-connect_2.12:3.5.3"),
+            ]
+            .iter()
+            .cloned()
+            .chain(
+                preset_configs
                     .iter()
-                    .cloned()
-                    .chain(
-                        preset_configs
-                            .iter()
-                            .chain(
-                                user_configs
-                                .iter()
-                            )
-                            .flat_map(|(k, v)| [Cow::Borrowed("--conf"), Cow::Owned(format!("{}={}", k, v))])
-                    )
-                    .collect())
-                }
-            }
+                    .chain(user_configs.iter())
+                    .flat_map(|(k, v)| {
+                        [Cow::Borrowed("--conf"), Cow::Owned(format!("{}={}", k, v))]
+                    }),
+            )
+            .collect()),
+        }
     }
 
     pub async fn new() -> Result<Self> {
@@ -287,7 +305,6 @@ impl ResourceManager for K8sClient {
     }
 }
 
-
 #[cfg(test)]
 mod tests {
     use super::*;