I'm going to tell you guys the answers I could find so far.
On Tuesday, July 26, 2011, Rafael Almeida <email@example.com
I couldn't find much documentation regarding how to make a cluster, but it
seemed simple enough. At cassandra server A (10.0.0.2) I had seeds:
"locahost". At server B (10.0.0.3) I configured seeds:
"10.0.0.2" and auto_bootstrap: true. Then I created a keyspace and a
few column families in it.
I imediately began to add items and to get all these "Internal error
processing get". I found it quite odd, I thought it had to do with the load
I was putting in, seeing that a few small tests had worked before. I spent quite
some time debugging, when I finally decided to write this e-mail. I wanted to
double check stuff, so I ran nodetool to see if everything was right. To my
surprise, there was only one of the node available. It took a little while for
the other one to show up as Joining and then as Normal.
After I waited that period, I was able to insert items to the cluster with no
error at all. Is that expected behaviour? What is the recommended way to setup a
cluster? Should it be done manually. Setting up the machines, creating all
keyspaces and colum families then checking nodetool and waiting for it to get
The problem that I was having was mainly because I had set node A as seed of B
and B as seed of A. I don't know what possessed me! Regarding the schema
configuration. I made a schema file and I load it using:
cassandra-cli -h localhost --batch < schema-file
It works alright.
On a side note, sometimes I get "Default TException" (that seems to
happen when the machine is in a heavier load than usual), commonly retrying the
read or insert right after works fine. Is that what's supposed to happen?
Perhaps I should raise some timeout somewhere?
I still don't get why that error was so frequent. At first I was testing it on
workstations, where people would compile stuff and run all sorts of software. I think
that slowed down things considerable and the system was having a hard time
managing connections from the application. After I moved it to dedicated computers
those problems ceased to happen.
This is what ./bin/nodetool -h localhost ring reports me:
Address DC Rack Status State Load Owns
10.0.0.3 datacenter1 rack1 Up Normal 3.43 GB 65.90%
10.0.0.2 datacenter1 rack1 Up Normal 1.77 GB 34.10%
It's still adding stuff. I have no idea why B owns so many more keys than A.
It happened due to my weird double-seed configuration. Now everything is fine. I've
explained how tokens work on a different thread.