Hello,
I have decommissioned a node, deleted data,commitlog and saved caches, changed
yaml file to not include self ip and started it. For some reason I do not fully
understand, Opscenter says that the node is in an unknown datacenter. Nodetool
says UJ but shows "?" in the Owns column. I have started the node yesterday. I
still see streams towards this node so I can I assume that once it finishes
joining, Opscenter will see it properly?
I remember that I might have setup the entire initial cluster with own ips in
the yaml file.To bring the cluster to a valid state, I assume that I have to
decommission the nodes one by one, delete the data, and restart with correct
yaml settings.Is this correct?
Also a change of the cluster name would be nice.How can this be done with
minimal impact?
On Wednesday, February 18, 2015 12:56 AM, Eric Stevens <[email protected]>
wrote:
> Seed nodes apparently don’t bootstrap
That's right, if a node has itself in its own seeds list, it assumes it's a
foundational member of the cluster, and it will join immediately with no
bootstrap.
If you've done this by accident, you should do nodetool decommission on that
node, and when it's fully left the cluster, wipe its data directory, edit the
yaml and remove it from the seeds list.
On Tue, Feb 17, 2015 at 3:25 PM, <[email protected]> wrote:
SimpleSnitch is not rack aware. You would want to choose seed nodes and then
not change them. Seed nodes apparently don’t bootstrap. All nodes need the same
seeds in the yaml file. Here is more info:
http://www.datastax.com/documentation/cassandra/2.0/cassandra/initialize/initializeSingleDS.html
Sean Durity – Cassandra Admin, Big Data TeamTo engage the team,create a
request From: Batranut Bogdan [mailto:[email protected]]
Sent: Tuesday, February 17, 2015 3:28 PM
To: [email protected]; [email protected]
Subject: Re: Adding new node to cluster Hello, I use SimpleSnitch. All the
nodes are in the sane datacenter. Not sure if all are in the same rack. On
Tuesday, February 17, 2015 8:53 PM, "[email protected]"
<[email protected]> wrote: What snitch are you using? You may need to
do some work on your topology file (or rackdc) to make sure you have the
topology you want. Also, it is possible you may need to restart OpsCenter
agents and/or your browser to see the nodes represented properly in OpsCenter.
Sean Durity – Cassandra Admin, Home Depot From: Batranut Bogdan
[mailto:[email protected]]
Sent: Tuesday, February 17, 2015 10:20 AM
To: [email protected];[email protected]
Subject: Re: Adding new node to cluster Hello, I know that UN is good, but what
troubles me is the addition of the own node's ip in it's yaml seeds section. On
Tuesday, February 17, 2015 3:40 PM, Reynald Bourtembourg
<[email protected]> wrote: Hi Bogdan
In nodetool status:
- UJ: means your node is Up and Joining
- UN: means your node is Up and in Normal state
UN in nodetool is good ;-) On 17/02/2015 13:56, Batranut Bogdan wrote:
Hello all, I have an existing cluster. When adding a new node, I saw that
Opscenter saw the node in an unknown cluster. In the yaml, the cluster name is
the same. So i have stopped the node and added it's ip address in the list of
seeds. Now Opscenter sees my node. But nodetool status now sees it as UN,
instead of UJ when it first started. One other mension is that even if I stop
the node, remove it's ip from the list of seeds, Opscenter sees the node in the
known clustre but nodetool sees it as UN. I am not sure what the implications
of adding a node's ip in it's seed list are and I think that for the existing
nodes I have might done the same. Eg. started with it's ip in the seed list but
after removing it and having to restart the nodes for whatever reason, I did
not see any changes. Is my cluster ok, or what do I need to do to bring the
cluster to a good state? Thank you.
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