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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (CASSANDRA-132) Support (limited) session level consistency
Date Wed, 10 Mar 2010 19:35:27 GMT

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

Jonathan Ellis resolved CASSANDRA-132.
--------------------------------------

    Resolution: Duplicate
      Assignee:     (was: Sandeep Tata)

superseded by CASSANDRA-876

> Support (limited) session level consistency
> -------------------------------------------
>
>                 Key: CASSANDRA-132
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-132
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>         Environment: all
>            Reporter: Sandeep Tata
>         Attachments: CASSANDRA-132-v2.patch, CASSANDRA-132-v3.patch, CASSANDRA-132.patch
>
>
> 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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