[jira] [Commented] (CASSANDRA-6495) LOCAL_SERIAL use QUORAM consistency level to validate expected columns

["sankalp kohli (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-6495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13852668#comment-13852668 ] 

sankalp kohli commented on CASSANDRA-6495:
------------------------------------------

[~jbellis]
For this should we use LOCAL_QUORAM for LOCAL_SERIAL or use the consistency level of commit. I think adding a third CL for this will be too confusing. So I think we can use CL of commit for validating columns.  

> 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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