Thanks a lot.
I set RF=2 at storage-conf.xml
How to set "write and read with QUORUM"?
They are run physically separate hw (But same since they are VM)
----- Original Message ----
From: Per Olesen <p...@trifork.com>
To: "user@cassandra.apache.org" <user@cassandra.apache.org>
Sent: Wed, June 9, 2010 2:20:43 PM
Subject: Re: Quick help on Cassandra please: cluster access and performance
Hi Wei,
> 1) I found this: the 2 node is slower (30%) than one node in both of write
> and select. Is this normal? (In theory, 2 nodes should be faster than one?).
> I monitroing the 2 nodes and found tehy are working and flush often (so, 2
> nodes works)
Which consistency level are you using for read and write and what is your
replication factor set to? If you have RF=2 and write and read with QUORUM,
cassandra need to do more work on each operation (but you get replicas in
return).
Also: Are you running both nodes on the same host / same disks or on physically
separate hw?
> 2)I am using Java. When I connect to nodes of Cassandra cluster, I am
> using one node's IP address as connection. Is this OK? Should I use the
> cluster name (Like Oracle RAC)?
You are doing the correct thing. You just connect to any node in the cluster
that is up.
/Per
