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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6495) LOCAL_SERIAL use QUORAM consistency level to validate expected columns
Date Thu, 19 Dec 2013 09:27:07 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13852760#comment-13852760
] 

Sylvain Lebresne commented on CASSANDRA-6495:
---------------------------------------------

Pretty sure we *must* use LOCAL_QUORUM. LOCAL_SERIAL should still provided serializability
within the local data-center and this require doing a LOCAL_QUORUM. Using the CL of the commit
would be incorrect in most case.

> LOCAL_SERIAL  use QUORAM consistency level to validate expected columns
> -----------------------------------------------------------------------
>
>                 Key: CASSANDRA-6495
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6495
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: sankalp kohli
>            Assignee: sankalp kohli
>            Priority: Minor
>
> If CAS is done at LOCAL_SERIAL consistency level, only the nodes from the local data
center should be involved. 
> Here we are using QUORAM to validate the expected columns. This will require nodes from
more than one DC. 
> We should use LOCAL_QUORAM here when CAS is done at LOCAL_SERIAL. 
> Also if we have 2 DCs with DC1:3,DC2:3, a single DC down will cause CAS to not work even
for LOCAL_SERIAL. 



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