[GitHub] [spark] dongjoon-hyun commented on pull request #32610: [SPARK-35460][K8S] verify the content of`spark.kubernetes.executor.podNamePrefix` before post it to k8s api-server

[GitBox <gi...@apache.org>]

dongjoon-hyun commented on PR #32610:
URL: https://github.com/apache/spark/pull/32610#issuecomment-1166883262

   Hi, @yaooqinn .
   
   K8s code itself has several constraint constant and it seems that we referred a wrong place.
   
   In the PR description, the error message referred DNS-1123. And, the following is the real DNS-1123 validation code. Please see that the Max Length is 253 instead of 63.
   
   https://github.com/kubernetes/apimachinery/blame/master/pkg/util/validation/validation.go#L203-L218
   ```go
   const DNS1123SubdomainMaxLength int = 253
   
   var dns1123SubdomainRegexp = regexp.MustCompile("^" + dns1123SubdomainFmt + "$")
   
   // IsDNS1123Subdomain tests for a string that conforms to the definition of a
   // subdomain in DNS (RFC 1123).
   func IsDNS1123Subdomain(value string) []string {
   	var errs []string
   	if len(value) > DNS1123SubdomainMaxLength {
   		errs = append(errs, MaxLenError(DNS1123SubdomainMaxLength))
   	}
   	if !dns1123SubdomainRegexp.MatchString(value) {
   		errs = append(errs, RegexError(dns1123SubdomainErrorMsg, dns1123SubdomainFmt, "example.com"))
   	}
   	return errs
   }
   ```


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