Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/19227
I see, so based on your comments:
1. Mesos should not honor principal/keytab configuration. Instead of rename
them, we should remove the `MESOS` here:
```
if (clusterManager == YARN || clusterManager == LOCAL || clusterManager
== MESOS) {
```
2. Spark on standalone is not well suitable for accessing security cluster
with tokens or keytabs currently.
Let me close this PR and rethink about some minor issues. BTW.
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