I think that the 3 nodes logs could help here. May be you should gist them?
Also you should probably set discovery to DEBUG or TRACE in logging.yml file.

It could give you some clues.


-- 
David Pilato | Technical Advocate | Elasticsearch.com
@dadoonet | @elasticsearchfr


Le 14 juillet 2014 à 19:56:15, Mike ([email protected]) a écrit:

Hello,

We recently had an issue adding a node to our Elastic Search cluster, and would 
be interested in anything I could do to troubleshoot the issue.

We currently have a 2 node cluster that has been running for some time.  I am 
looking to add a third node to this cluster.  All nodes are running on AWS, and 
we use ec2 discovery to allow nodes to discover each other:

discovery:
    type: ec2
    ec2:
        groups: vpc-elastic-search4


Both nodes are part of the security group vpc-elastic-search4.

We attempted to bring up a new node that was an AMI of one of the existing two 
nodes, and recreated the partition we utilized for storing index data.  We then 
added the node to the vpc-elastic-search4 security group.

However, when we brought up the node, something strange happened causing us to 
abort the attempt.  The status of the nodes showed:

Node1 - Status: green, number of nodes: 2
Node2 - Status: yellow: number of nodes: 2 (relocating and initializing shards)
Node3 - Status: yellow: number of nodes: 2 (relocating and initializing shards) 
- This was the new node.

We immediately shutdown node 3.  After that point, Node 2 had the number of 
nodes set to 1, while Node 1 still showed 2 still showed green.

We shut down and restarted Node2, and it properly recovered from Node 1.

It almost seems that starting Node 3 caused Node 2 to become partitioned from 
Node 1, without Node 1 also reflecting that change?  However, that is a guess 
on my part.  I'm reluctant to try again for fear of causing damage.

We are running 0.90.11.  Any insight would be appreciated,

-Mike
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