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From Alain RODRIGUEZ <arodr...@gmail.com>
Subject Re: Creation of Async Datacenter for Monitoring purposes and Engineering Services purpose
Date Wed, 13 Apr 2016 13:36:28 GMT
>
> Live Data delay of 1-2 Hours is acceptable. It is essential that
> replication to this DC to not impact the other 2 data centers.
>

Well, you can have immediate replication with no impact on other DC.
Basically set your clients to use LOCAL_ONE/QUORUM and specify a DCAWARE
policy on the client side too. On server side, just add the RF 'DC3: 2' (or
3 or whatever).

This way, all the writes to the chosen keyspaces will go to DC3 also, but
client won't care about how successful this write to DC3 is. So those
requirements are respected.

Is there a way to copy data in async fashion to new DC3 so that it doesnt
> impact existing DC's


What would be bad with this 'standard' approach?

Cheers,
-----------------------
Alain Rodriguez - alain@thelastpickle.com
France

The Last Pickle - Apache Cassandra Consulting
http://www.thelastpickle.com

2016-04-13 11:52 GMT+02:00 Bhuvan Rawal <bhu1rawal@gmail.com>:

> Hi All,
>
> We have 2 Running Datacenters in physically seperate DC's with 3 Nodes
> each. There is a requirement of an Audit DC for issuing queries which will
> not be concerned with live application traffic. Live Data delay of 1-2
> Hours is acceptable. It is essential that replication to this DC to not
> impact the other 2 data centers.
>
> Is there a way to copy data in async fashion to new DC3 so that it doesnt
> impact existing DC's, possibly without querying (using sstable/commitlog).
>
> Regards,
> Bhuvan
>
>
>

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