[jira] [Updated] (CASSANDRA-7877) Tunable consistency across multiple datacenters - LOCAL_QUORUM + quorum at 1 out of N other DCs

["Hari Sekhon (JIRA)" <ji...@apache.org>]

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

Hari Sekhon updated CASSANDRA-7877:
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    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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