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https://issues.apache.org/jira/browse/CASSANDRA-3773?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13191415#comment-13191415
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Jonathan Ellis commented on CASSANDRA-3773:
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The reasoning behind 10s is that schema changes are pushed by the coordinator; 
only nodes that are down during the push will get it via gossip.
                
> make default schema migration wait time RING_DELAY
> --------------------------------------------------
>
>                 Key: CASSANDRA-3773
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3773
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>            Reporter: Peter Schuller
>            Assignee: Peter Schuller
>            Priority: Minor
>         Attachments: CASSANDRA-3773-30s-v2.txt, CASSANDRA-3773-30s.txt, 
> CASSANDRA-3773-RING_DELAY.txt
>
>
> The default of 10 seconds feels strange to me since we have established that 
> RING_DELAY is the appropriate wait time for gossip, which should include 
> schema migrations.
> Patch makes it RING_DELAY by default. Alternate patch makes it 30 seconds; I 
> don't know how much we care about not referencing non-CLI code from the CLI.

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