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From pankaj soni <>
Subject IP address resolution in MultiDC setup
Date Mon, 25 Apr 2011 09:26:52 GMT

We have a scenario for which we are considering using apache Cassandra for
deployment for our data storage needs.The setup is to be spread across
multiple data centers in different regions(physical locations). With each
data center having multiple nodes. However we can afford at most 1 public IP
address for each data center. With nodes inside the data center
communicating over private IP. We plan to use RF=3 and
for replica placement.

1 . This leads us to question that how will node discovery take place and
how will Cassandra ring be formed between multiple data centers?

2.  How is data partitioning to be carried on in this scenario?

3. If say data resides in Data center 1 node 2 and read query is sent to
Data center 2 node 1, assuming it DC2 has no local replica than how is read
query to be serviced? This is our biggest concern as articles relating to
public/private IPs for cassandra could not be found.

As in Cassandra any node can be queried for data and same goes for write
requests, cassandra is our first choice in environments we have to deploy.

Any suggestion is welcome.


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