[jira] [Closed] (KYLIN-2659) Refactor KylinConfig so that all the default configurations are hidden in kylin-defaults.properties

["Shaofeng SHI (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KYLIN-2659?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shaofeng SHI closed KYLIN-2659.
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> Refactor KylinConfig so that all the default configurations are hidden in kylin-defaults.properties
> ---------------------------------------------------------------------------------------------------
>
>                 Key: KYLIN-2659
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2659
>             Project: Kylin
>          Issue Type: Improvement
>            Reporter: hongbin ma
>            Assignee: hongbin ma
>             Fix For: v2.1.0
>
>
> Currently we ship a conf/kylin.properties file with a lot of configuration overrides. This is not a standard approach compared with other projects like hadoop or spark.
> It's better to have a kylin-defaults.properties file to hide all the default configurations, users will only have to override necessary configurations in a blank kylin.properties.
> After the refactor, a config might be override by the following precedence:
> 1. KV in kylin.properties.override, which is more of a "secret feature", never documented.
> 2. KV in kylin.properties, users are suggested to override configs here
> 3. KV in kylin-defaults.properties, readonly to users
> 4. KV in KylinConfigBase, readonly to users
> The refactor will be backward compatible



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