[jira] Updated: (CASSANDRA-132) Support (limited) session level consistency

["Sandeep Tata (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-132?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sandeep Tata updated CASSANDRA-132:
-----------------------------------

    Description: 
Limited session-level consistency: if the client connects to a node and performs operations on rows/keys that are local to that node (in that node's key range), we should be able to guarantee read-your-writes consistency. If the session ends because of a failure, and the client has to reconnect, there are no guarantees across the sessions.

(This is a common practical variation of eventual consistency, see: http://www.allthingsdistributed.com/2008/12/eventually_consistent.html for context.)

Supporting this for a "local" sessions is significantly easier than supporting session level consistency when the node does not own the data. A non-owning node that is reading values from a remote replica will need to either do 
a) quorum reads and writes to guarantee session level read-your-writes
b) pick at least one node to block on and stick to that node as a "master" for the session.

  was:
Limited session-level consistency: if the client connects to a node and performs operations on rows that are local to that node, we should be able to guarantee read-your-writes consistency. If the session ends because of a failure, and the client has to reconnect, you only provide eventual consistency across the sessions.

(This is a common practical variation of evantual consistency, see: http://www.allthingsdistributed.com/2008/12/eventually_consistent.html for context.)

        Summary: Support (limited) session level consistency  (was: Support session level consistency)

> Support (limited) session level consistency
> -------------------------------------------
>
>                 Key: CASSANDRA-132
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-132
>             Project: Cassandra
>          Issue Type: Improvement
>    Affects Versions: trunk
>         Environment: all
>            Reporter: Sandeep Tata
>            Assignee: Sandeep Tata
>             Fix For: trunk
>
>
> Limited session-level consistency: if the client connects to a node and performs operations on rows/keys that are local to that node (in that node's key range), we should be able to guarantee read-your-writes consistency. If the session ends because of a failure, and the client has to reconnect, there are no guarantees across the sessions.
> (This is a common practical variation of eventual consistency, see: http://www.allthingsdistributed.com/2008/12/eventually_consistent.html for context.)
> Supporting this for a "local" sessions is significantly easier than supporting session level consistency when the node does not own the data. A non-owning node that is reading values from a remote replica will need to either do 
> a) quorum reads and writes to guarantee session level read-your-writes
> b) pick at least one node to block on and stick to that node as a "master" for the session.

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