[jira] Commented: (CASSANDRA-2338) C* consistency level needs to be pluggable

["Edward Capriolo (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-2338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13008147#comment-13008147 ] 

Edward Capriolo commented on CASSANDRA-2338:
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I was thinking that the approach to the other data centers is allow the CF information to be overridden per host but still stored across the cluster. For example if I have an ETL cluster. I only want those nodes to have read_repair_chance=0. 

> C* consistency level needs to be pluggable
> ------------------------------------------
>
>                 Key: CASSANDRA-2338
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2338
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Matthew F. Dennis
>            Priority: Minor
>
> for cases where people want to run C* across multiple DCs for disaster recovery et cetera where normal operations only happen in the first DC (e.g. no writes/reads happen in the remove DC under normal operation) neither LOCAL_QUORUM or EACH_QUORUM really suffices.  
> Consider the case with RF of DC1:3 DC2:2
> LOCAL_QUORUM doesn't provide any guarantee that data is in the remote DC.
> EACH_QUORUM requires that both nodes in the remote DC are up.
> It would be useful in some situations to be able to specify a strategy where LOCAL_QUORUM is used for the local DC and at least one in a remote DC (and/or at least in *each* remote DC).

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