CODEWITHSUNDEEP
cassandra
Akki
Akki

Reputation: 2359

Cassandra multinode cluster setup issue

I am trying to setup a Cassandra multinode cluster on CentOS 7 with OpenJDK.

I have 2 Nodes:

I have done following things till now:

  1. Downloaded the tarball of Cassandra from PlanetCassandra site
  2. Extracted it in Documents folder.
  3. Created all the necessary directories (data/saved_cache, data/commitlog, data/data) as mentioned in the YAML file.

And I have made 3 changes in my conf/cassandra.yaml file as follows:

On node 10.99.189.49:

seeds: "10.99.189.49" 
listen_address: 10.99.189.49
rpc_address: 10.99.189.49

On node 10.99.189.50:

seeds: "10.99.189.49" 
listen_address: 10.99.189.50
rpc_address: 10.99.189.50

Now I run cassandra on node 10.99.189.49 and then I run cassandra on the other node.

Cassandra starts normally on both the nodes BUT when I do:

bin/nodetool status

I can see only one node in it.

Can anyone point what I am doing wrong or missing something?

Upvotes: 1

Views: 184

Answers (2)

Aaron
Aaron

Reputation: 57748

So I started adding tips in the comments, and for my 3rd time around I thought I'd start putting them all together in an actual answer.

DataStax does a pretty good job documenting how this should work. Make sure that you've gone through these docs (specifically the first one) and that you're following all the steps:

In addition to everything you have mentioned above, make sure that the cluster_name is the same on each node.

I find it easier to make this work using the GossipingPropertyFileSnitch. Set that in your cassandra.yaml on each node:

endpoint_snitch: GossipingPropertyFileSnitch

Then make sure that each of your nodes is specifying the same default data center in the cassandra-rackdc.properties file:

dc=DC1

Get your first node (.49) up-and-running. Verify it with nodetool status.

Also verify that you have opened the necessary ports in your firewall. From .49, try telneting your way to the other node on the ports that Cassandra requires. I recommend 7000, as that is the port for non-SSL inter-node communication.

telnet 10.99.189.50 7000

Once you're sure all that works and everything is configured properly, then bring up .50. I remember reading that you should wait at least 2 minutes before bringing up another node, so do that just to be on the safe side. Tail the logs to make sure it handshakes with the other node, or to see any errors:

tail -f /var/log/cassandra/system.log

Notes: Your log location may vary. I'm assuming you're running 2.2. If you are using a different version of Cassandra, please indicate it.

Hope this helps!

Upvotes: 1

Ashraful Islam
Ashraful Islam

Reputation: 12830

On both node use

seeds: "10.99.189.49,10.99.189.50"

and also restart both node cassandra

Upvotes: 0

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