Yikun commented on a change in pull request #35943:
URL: https://github.com/apache/spark/pull/35943#discussion_r832802242
##########
File path:
resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/KubernetesConf.scala
##########
@@ -270,7 +271,7 @@ private[spark] object KubernetesConf {
.replaceAll("-+", "-"),
"",
KUBERNETES_DNSNAME_MAX_LENGTH
- )
+ ).stripPrefix("-").stripSuffix("-")
Review comment:
Note for my self or others: k8s label allow `dashes (-), underscores
(_), dots (.)`, we alread replaced `underscores (_)`, `dots (.)` by `dashes
(-)` before, so strip "-" prefix/suffix is enough in here.
Below tests are also passed:
```
assert(KubernetesConf.getAppNameLabel(".hello.") === "hello")
assert(KubernetesConf.getAppNameLabel("_hello_") === "hello")
```
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