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From "Hari Sekhon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-7877) Tunable consistency across multiple datacenters - LOCAL_QUORUM + quorum at 1 out of N other DCs
Date Thu, 04 Sep 2014 11:18:51 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-7877?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hari Sekhon updated CASSANDRA-7877:
-----------------------------------
    Summary: Tunable consistency across multiple datacenters - LOCAL_QUORUM + quorum at 1
out of N other DCs  (was: Tunable consistency across datacenters - LOCAL_QUORUM + 1 other
DC)

> Tunable consistency across multiple datacenters - LOCAL_QUORUM + quorum at 1 out of N
other DCs
> -----------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-7877
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7877
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Hari Sekhon
>            Priority: Minor
>
> Right now tunable consistency allows for things like local quorum and each quorum across
multiple datacenters.
> I propose something in between where you achieve local quorum + 1 node at other DC. This
would make sure the data is written to the other datacenter for resilience purposes but be
better performing that having to do an each quorum write at both datacenters. Mind you re-reviewing
each_quorum I'm not sure how much more performant this would be...
> EDIT: thinking about this more this is probably reasonably covered by each quorum given
that by the time you write to 1 replica node in other DC you may as well write to 2 in which
case each quorum is probably the way to go.
> Although if you have 3 or more datacenters then perhaps there should be an option to
do local_quorum + quorum in one other DC but not all the multiple DCs before confirming write
to prevent data loss on site failure?



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