pan3793 commented on PR #41181:
URL: https://github.com/apache/spark/pull/41181#issuecomment-2574941124
@maomaodev I see what happens, the official Spark installs `krb5-user` which
generates a default `/etc/krb5.conf` with content
```
[libdefaults]
default_realm = ATHENA.MIT.EDU
...
```
so that `KerberosUtil.getDefaultRealm` works well, this is not the expected
behavior but happens to work. I think the root cause is
`spark.kubernetes.kerberos.krb5.path` claims to mount on both driver and
executors but actually not.
In short, creating a dummy `/etc/krb5.conf` in your base image should
workaround your issue, and the correct solution is mounting
`spark.kubernetes.kerberos.krb5.path` to executor pod correctly.
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