[jira] [Created] (FLINK-5364) Rework JAAS configuration to support user-supplied entries

[Shang Yuanchun (Jira)]

Eron Wright  created FLINK-5364:
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             Summary: Rework JAAS configuration to support user-supplied entries
                 Key: FLINK-5364
                 URL: https://issues.apache.org/jira/browse/FLINK-5364
             Project: Flink
          Issue Type: Bug
          Components: Cluster Management
            Reporter: Eron Wright
            Assignee: Eron Wright
            Priority: Critical


Recent issues (see linked) have brought to light a critical deficiency in the handling of JAAS configuration.  

1. the MapR distribution relies on an explicit JAAS conf, rather than in-memory conf used by stock Hadoop.
2. the ZK/Kafka/Hadoop security configuration is supposed to be independent (one can enable each element separately) but isn't.

Perhaps we should rework the JAAS conf code to merge any user-supplied configuration with our defaults, rather than using an all-or-nothing approach.  

We should also address some recent regressions:
1. The HadoopSecurityContext should be installed regardless of auth mode.  For example, verify the use of HADOOP_USER_NAME in 'SIMPLE' auth mode.
2. Fix the use of alternative authentication methods - delegation tokens and Kerberos ticket cache.






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