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Date: Mon, 25 Apr 2011 14:56:52 +0530
Message-ID: <BANLkTikWGOtWkBOBAs+ibq5voSmjLm=gQQ@mail.gmail.com>
Subject: IP address resolution in MultiDC setup
From: pankaj soni <pankajsoni0126@gmail.com>
To: user@cassandra.apache.org
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Hi,

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
OldNetworkTopologyStrategy
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.

pankaj

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<span class=3D"Apple-style-span" style=3D"border-collapse: collapse; font-f=
amily: arial, sans-serif; font-size: 13px; ">Hi,=A0<div><br></div><div>We h=
ave a scenario for which we are considering using apache Cassandra for depl=
oyment for our data storage needs.The setup is to be spread across multiple=
 data centers in different regions(physical locations). With each data cent=
er 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=3D3 and=A0<span style=3D"font-family: &#39;T=
imes New Roman&#39;, serif; font-size: 16px; ">OldNetworkTopologyStrategy f=
or replica placement.</span></div>
<div><br></div><div><br></div><div>1 . This leads us to question that how w=
ill node discovery take place and how will=A0Cassandra=A0ring be formed bet=
ween multiple data centers?</div><div><br></div><div>2. =A0How is data part=
itioning to be carried on in this scenario?</div>
<div><br></div><div>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 replic=
a than how is read query to be serviced?=A0This is our biggest concern as a=
rticles relating to public/private IPs for cassandra could not be found.</d=
iv>
<div><br></div><div><br></div><div>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.=A0</div><div><br></div><div>Any suggestion=
 is welcome.=A0</div>
<div><br></div><font color=3D"#888888"><div>pankaj</div></font></span>

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