Alexey Romanenko commented on LIVY-450:

Since, there are no other thoughts on this, probably, it would make sense to go 
forward and submit a PR. [~zjffdu] what do you think?

> Override config options by environment variables.
> -------------------------------------------------
>                 Key: LIVY-450
>                 URL: https://issues.apache.org/jira/browse/LIVY-450
>             Project: Livy
>          Issue Type: Improvement
>            Reporter: Alexey Romanenko
>            Priority: Major
> Add a possibility to override all config options by environment variables. 
> For example:
>  {{LIVY_SPARK_MASTER}} automatically overrides {{livy.spark.master}} and 
> {{LIVY_SPARK_DEPLOY_MODE}} overrides {{livy.spark.deploy-mode}}.
> It can be quite useful to use the same Livy image in different modes (local 
> and cluster). 
> Any pros/cons for or against that?

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