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From "Stefan Podkowinski (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13580) Readonly datacenter support
Date Thu, 08 Jun 2017 14:23:18 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16042756#comment-16042756
] 

Stefan Podkowinski commented on CASSANDRA-13580:
------------------------------------------------

If the scope was to simply exclude DCs from repairs, wouldn't {{repair -dc}} have the same
effect?

I'm also still trying to wrap my head around the help text of the new repair option:

"Use --ignore_readonly_dcs to do a full sync on repair - even stream out data from read only
dcs."

What's being ignored here? The read only nodes from the repair or the read only semantics
that would usually be in place ignoring those nodes by default during repairs? Does this option
imply -full? 

I'd personally avoid naming this "readonly datacenter", as people likely have different expectations
about the actual meaning. E.g. nodes in such a DC might still be able to effect the cluster
through actions like gossip, schema, or read repairs. Nodes in a read only DC will still receive
and persist data from the rest of the clusters and get counted against the CL, right? 


> Readonly datacenter support
> ---------------------------
>
>                 Key: CASSANDRA-13580
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13580
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Marcus Eriksson
>            Assignee: Marcus Eriksson
>             Fix For: 4.x
>
>
> Some setups include datacenters where only reads are performed (example could be datacenter
dedicated for taking backups).
> We could use this information during repair to make sure that we never stream out of
a read only dc.



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