[jira] [Created] (FLINK-37467) FlinkSessionJob: possibility to use configmaps and secrets in args parameter

["Diego Lobba (Jira)" <ji...@apache.org>]

Diego Lobba created FLINK-37467:
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             Summary: FlinkSessionJob: possibility to use configmaps and secrets in args parameter
                 Key: FLINK-37467
                 URL: https://issues.apache.org/jira/browse/FLINK-37467
             Project: Flink
          Issue Type: Improvement
          Components: Kubernetes Operator
    Affects Versions: 1.10.0
            Reporter: Diego Lobba


It would be nice to have the args parameter used by the Flink job as a string interpolated using existing Kubernetes configmap and secrets resources.

Pros:
 * using kubernetes native resources to manage secrets and configuration values
 * avoid duplicating configurations used by multiple jobs
 * tracking of dependant configmaps and secrets used by the FlinkSessionJob

Considerations:
 * The pod running  the job has access to all environment variables defined in the target session cluster, however
 * the args parameter does not enable interpolating environment variables, for instance if string "${MY_ENV_VARIABLE}" is defined as string value to the args parameter, there is no interpolation and the job is going to see the literal string value passed; moreover
 * increasing the number of environment variables to the session cluster does not scale well with the number of jobs, is not enforcing job independence as a principle and would required downtime to all job managed by the session cluster in case any of them require an update to the environment variable.



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