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https://issues.apache.org/jira/browse/CASSANDRA-2100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12999473#comment-12999473
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Jonathan Ellis commented on CASSANDRA-2100:
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I'm not a fan of having side effects in CFMetaData like that.

I checked w/ Gary and his take was, "The saving probably belongs in 
UpdateColumnFamily.  CFMetaData.apply() should only affect a single 
object—-nothing persistent."

> Restart required to change cache_save_period
> --------------------------------------------
>
>                 Key: CASSANDRA-2100
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2100
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.7.0
>            Reporter: Nick Bailey
>            Assignee: Jon Hermes
>            Priority: Minor
>             Fix For: 0.7.3
>
>         Attachments: 2100-2.txt, 2100-3.txt, 2100.txt
>
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> The cache_save_period is set in the schema for each column family.  However 
> this value is only checked when a node starts up so changing this value isn't 
> really dynamic.
> We should actually change this when the schema changes instead of having to 
> restart.

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