[jira] [Commented] (CASSANDRA-8287) Row Level Isolation is violated by read repair

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

    [ https://issues.apache.org/jira/browse/CASSANDRA-8287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14205713#comment-14205713 ] 

sankalp kohli commented on CASSANDRA-8287:
------------------------------------------

cc [~brandon.williams], [~slebresne]

> Row Level Isolation is violated by read repair
> ----------------------------------------------
>
>                 Key: CASSANDRA-8287
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8287
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: sankalp kohli
>            Priority: Minor
>
> In 1.1, row level isolation was added. As per the blog post 
> http://www.datastax.com/dev/blog/row-level-isolation
> "Cassandra guarantees that the changes to login and password are either both applied or none are."
> This is not true with background read repair. Consider this as given in the blog post.
> You run 
> UPDATE Users
>     SET login='eric22' AND password='f3g$dq!'
>     WHERE key='550e8400-e29b-41d4-a716-446655440000'
> There are 3 machines A,B and C and replication is RF=3
> 1) Machine A did not get this update as it was down and past hint window. 
> 2) Machine A comes online.
> 3) You now only read the password.
> 4) password is now read repaired on A. 
> SO on machine A, password = f3g$dq! and login is still old 



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