[jira] [Created] (FLINK-6713) Document how to allow multiple Kafka consumers / producers to authenticate using different credentials

[Shang Yuanchun (Jira)]

Tzu-Li (Gordon) Tai created FLINK-6713:
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             Summary: Document how to allow multiple Kafka consumers / producers to authenticate using different credentials
                 Key: FLINK-6713
                 URL: https://issues.apache.org/jira/browse/FLINK-6713
             Project: Flink
          Issue Type: Improvement
          Components: Documentation, Kafka Connector
            Reporter: Tzu-Li (Gordon) Tai
            Assignee: Tzu-Li (Gordon) Tai


The doc improvements should include:

1. Clearly state that the built-in JAAS security module in Flink is a JVM process-wide static JAAS file installation (all static JAAS files are, not Flink specific), and therefore only allows all Kafka consumers and producers in a single JVM (and therefore the whole job, since we do not allow assigning operators to specific slots) to authenticate as one single user.

2. If Kerberos authentication is used, 2 approaches: 1) with Flink's built-in Kerberos support, multiple user principals need to be merged as a single keytab, or 2) self-ship multiple keytab files, and use Kafka's dynamic JAAS configuration through client properties to point to separate keytabs for each consumer / producer. Note that ticket cache would never work for multiple authentications.

3. If plain simple login is used: Kafka's dynamic JAAS configuration should be used (and is the only way to do so).



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