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https://issues.apache.org/jira/browse/CASSANDRA-20827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18018887#comment-18018887
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Paulo Motta commented on CASSANDRA-20827:
-----------------------------------------

Since this is changing output format, we should probably make a setting 
{{-Dcassandra.config.virtual_table_complex_settings_format_json=true}} (or 
other name) to allow users to keep the old format by overriding this property.

Should this go in 5.0 with 
{{-Dcassandra.config.virtual_table_complex_settings_format_json=false}} and 
trunk with 
{{-Dcassandra.config.virtual_table_complex_settings_format_json=true}} + note 
on NEWS.txt ?

> Represent complex settings as JSON on system_views.settings table
> -----------------------------------------------------------------
>
>                 Key: CASSANDRA-20827
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-20827
>             Project: Apache Cassandra
>          Issue Type: Improvement
>          Components: Local/Config
>            Reporter: Paulo Motta
>            Assignee: Marko Tsymbaliuk
>            Priority: Normal
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> Complex configuration (maps/sets/lists) are represented as 
> Collections.toString() on {{system.settings}} virtual table:
> {code:java}
> cqlsh> select * from system_views.settings where name='seed_provider' ;
>  name | value
> ------+-------
> (0 rows)
> cqlsh> select * from system_views.settings where 
> name='seed_provider.parameters' ;
>  name                     | value
> --------------------------+------------------------
>  seed_provider.parameters | {seeds=127.0.0.1:7000}
> {code}
> While this is fine for human consumption, it's not ideal for programmatic 
> access, since it requires custom parsing. 
> This ticket is to add ability of representing complex types as JSON on 
> {{system.settings}} and potentially making it default in trunk, so the above 
> would return:
> {code:java}
> cqlsh> select * from system_views.settings where name='seed_provider' ;
>  name | value
> ------+-------
> (0 rows)
> cqlsh> select * from system_views.settings where 
> name='seed_provider.parameters' ;
>  name                     | value
> --------------------------+------------------------
>  seed_provider.parameters | {"seeds": "127.0.0.1:7000"}{code}



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