Radu Stoica commented on CRAIL-11:

I like the idea to be able to set parameters from the command line. It would be 
very nice for trying a new parameter value quickly or for scripting.

At the same time, having environment variables in the conf file is also nice to 
have for two reasons at least: a) we can set default parameters such as 
"crail.user $ USER", and b) it is easier to put all environment variables in a 
file than pack everything on the command line.

Spark also allows setting configuration parameters from the command line with 
-conf so having this option would not be surprising. I think Hadoop also allows 
using environment variables so having this would also be similar.


> Enable environment variable expansion in crail-site.conf
> --------------------------------------------------------
>                 Key: CRAIL-11
>                 URL: https://issues.apache.org/jira/browse/CRAIL-11
>             Project: Apache Crail
>          Issue Type: Improvement
>            Reporter: Radu Stoica
>            Priority: Trivial
> The idea is to allow using environment variables in crail-site.conf to allow 
> more flexibility when deploying Crail.
> Pull request: https://github.com/apache/incubator-crail/pull/7

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