[GitHub] [spark] gaborgsomogyi opened a new pull request #24204: [SPARK-27270][SS] Add Kafka dynamic JAAS authentication debug possibility

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gaborgsomogyi opened a new pull request #24204: [SPARK-27270][SS] Add Kafka dynamic JAAS authentication debug possibility
URL: https://github.com/apache/spark/pull/24204
 
 
   ## What changes were proposed in this pull request?
   
   `Krb5LoginModule` supports debug parameter which is not yet supported from Spark side. This configuration makes it easier to debug authentication issues against Kafka.
   
   In this PR I've added `spark.kafka.jaas.authentication.debug` with default `false` which controls `Krb5LoginModule` debug flag.
   
   Additionally found some hardcoded values like `ssl.truststore.location`, etc... which could be error prone if Kafka changes it so in such cases Kafka define used.
   
   ## How was this patch tested?
   
   Existing + additional unit tests + on cluster.
   

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