[Engine-devel] Using config values

[Sahina Bose]

On 11/29/2013 01:46 PM, Kanagaraj wrote:
> Hi All,
>
> The are some issues arising in configurations whenever we move up on 
> the versions(3.3 => 3.4), because of the way we store and interpret them.
>
> Whenever there is a new cluster level, you will need to add a new 
> entry for all(most) of the configuration. Mostly a copy paste if you 
> see from 3.2 to 3.3, except some CPU/PM type related configurations.
> Better option would be to have the defaul config value in 
> ConfigValues.java and the overrides will go to config.sql. In this 
> approach you don't need a new entries to config.sql when there is a 
> new cluster level.
>
> Lets take an exmaple, "SupportForceCreateVG" - This is supported from 
> 3.1 onwards,
>
> If you look at config.sql, you will see following entries
> select fn_db_add_config_value('SupportForceCreateVG','false','3.0');
> select fn_db_add_config_value('SupportForceCreateVG','true','3.1');
> select fn_db_add_config_value('SupportForceCreateVG','true','3.2');
> select fn_db_add_config_value('SupportForceCreateVG','true','3.3');
>
> And in ConfigValues.java
>
>     @TypeConverterAttribute(Boolean.class)
>     @DefaultValueAttribute("false")
>     SupportForceCreateVG,
>
> Now if there is 3.4 and 3.5, the user needs to add 2 more entries, 
> which i feel is redundant.
>
> Instead we can make
>
>     @TypeConverterAttribute(Boolean.class)
>     @DefaultValueAttribute("true")
>     SupportForceCreateVG,
>
> and have only the following in config.sql
> select fn_db_add_config_value('SupportForceCreateVG','false','3.0');
>
> if a particular value(for a specific cluster level) is not found in 
> Config.sql, the fallback is to use the value available in 
> ConfigValues.java.
>
> Please share your thoughts on this.

+1

>
> Thanks,
> Kanagaraj
>
>
>
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