hehuiyuan commented on a change in pull request #24219: [SPARK-27258][K8S]Deal 
with the k8s resource names that don't match their own regular expression 
URL: https://github.com/apache/spark/pull/24219#discussion_r269184055
 
 

 ##########
 File path: 
resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/KubernetesConf.scala
 ##########
 @@ -198,5 +198,6 @@ private[spark] object KubernetesConf {
       .replaceAll("\\.", "-")
       .replaceAll("[^a-z0-9\\-]", "")
       .replaceAll("-+", "-")
+      .replaceAll("^-", "")
 
 Review comment:
    **I replaced the first character**.The first character is '-',which is not 
allowed for Pod , Secret , Service, etc .
   
   `.replaceAll("^-", "")` ,we can use the code to avoid that the first 
character of all kubernetes resources(Pod ,Service,Secret,etc) name is  '-'
   
   `private val preferredServiceName = 
s"${kubernetesConf.resourceNamePrefix}$DRIVER_SVC_POSTFIX"
   `
   
   Then the first character of preferredServiceName is 0-9 or a-z, we only 
check the first character that is 0-9 or a-z.
   if the first character is a-z,we use preferredServiceName as the Service 
name.
   Otherwise ,the first character is 0-9,we use shorterServiceName as the 
Service name.
   

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