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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 11:18:52 GMT

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

Hari Sekhon updated CASSANDRA-7877:
-----------------------------------
    Description: 
Right now tunable consistency allows for things like local quorum and each quorum across multiple
datacenters.

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?

  was:
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?


> 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.
> 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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