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https://issues.apache.org/jira/browse/CASSANDRA-15254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17525371#comment-17525371
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David Capwell commented on CASSANDRA-15254:
-------------------------------------------

FYI I am trying to get CASSANDRA-17166 in before the freeze, I know you are 
busy but if you do have the time it would be good to look at least the 
SettingsTable changes; one open issue I do not address is

{code}
prop.set(config, fromStringtoString(prop.get(config)))
{code}

I figured this patch could deal with it.  The core issue is for types where 
toString doesn't return something that can be parsed (such as setting 
hinted_handoff_disabled_datacenters (uses collections)), so we need to change 
the table's output values to be something which can be parsed

> Allow UPDATE on settings virtual table to change running configurations
> -----------------------------------------------------------------------
>
>                 Key: CASSANDRA-15254
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15254
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Feature/Virtual Tables
>            Reporter: Chris Lohfink
>            Assignee: Benjamin Lerer
>            Priority: Normal
>
> Allow using UPDATE on the system_views.settings virtual table to update 
> configs at runtime for the equivalent of the dispersed JMX 
> attributes/operations.



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