pan3793 commented on code in PR #3590:
URL: https://github.com/apache/kyuubi/pull/3590#discussion_r1011139391


##########
externals/kyuubi-spark-sql-engine/src/main/scala/org/apache/kyuubi/engine/spark/SparkSQLEngine.scala:
##########
@@ -168,6 +168,8 @@ object SparkSQLEngine extends Logging {
 
     if (Utils.isOnK8s) {
       kyuubiConf.setIfMissing(FRONTEND_CONNECTION_URL_USE_HOSTNAME, false)
+      val podNamePrefix = s"kyuubi-${user}-${Instant.now().toEpochMilli}"

Review Comment:
   @hanna-liashchuk, it introduces a regression if `user` contains char which 
not allowed in 
https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#dns-subdomain-names
   
   ```
   java.lang.IllegalArgumentException: 'kyuubi-bdms_pancheng-1667361024618' in 
spark.kubernetes.executor.podNamePrefix is invalid. must conform 
https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#dns-subdomain-names
 and the value length <= 237
        at 
org.apache.spark.internal.config.TypedConfigBuilder.$anonfun$checkValue$1(ConfigBuilder.scala:108)
 ~[spark-core_2.12-3.3.1.1.jar:3.3.1.1]
        at 
org.apache.spark.internal.config.TypedConfigBuilder.$anonfun$transform$1(ConfigBuilder.scala:101)
 ~[spark-core_2.12-3.3.1.1.jar:3.3.1.1]
        at scala.Option.map(Option.scala:230) ~[scala-library-2.12.15.jar:?]
        at 
org.apache.spark.internal.config.OptionalConfigEntry.readFrom(ConfigEntry.scala:239)
 ~[spark-core_2.12-3.3.1.1.jar:3.3.1.1]
        at 
org.apache.spark.internal.config.OptionalConfigEntry.readFrom(ConfigEntry.scala:214)
 ~[spark-core_2.12-3.3.1.1.jar:3.3.1.1]
        at org.apache.spark.SparkConf.get(SparkConf.scala:261) 
~[spark-core_2.12-3.3.1.1.jar:3.3.1.1]
        at 
org.apache.spark.deploy.k8s.KubernetesConf.get(KubernetesConf.scala:70) 
~[spark-kubernetes_2.12-3.3.1.1.jar:3.3.1.1]
        at 
org.apache.spark.deploy.k8s.KubernetesExecutorConf.<init>(KubernetesConf.scala:156)
 ~[spark-kubernetes_2.12-3.3.1.1.jar:3.3.1.1]
        at 
org.apache.spark.deploy.k8s.KubernetesConf$.createExecutorConf(KubernetesConf.scala:246)
 ~[spark-kubernetes_2.12-3.3.1.1.jar:3.3.1.1]
        at 
org.apache.spark.scheduler.cluster.k8s.ExecutorPodsAllocator.$anonfun$requestNewExecutors$1(ExecutorPodsAllocator.scala:394)
 ~[spark-kubernetes_2.12-3.3.1.1.jar:3.3.1.1]
        at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:158) 
~[scala-library-2.12.15.jar:?]
        at 
org.apache.spark.scheduler.cluster.k8s.ExecutorPodsAllocator.requestNewExecutors(ExecutorPodsAllocator.scala:387)
 ~[spark-kubernetes_2.12-3.3.1.1.jar:3.3.1.1]
   ```



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