Hello Phani,
Usually the dedicated masters are much smaller than the data nodes, because
they have much less work to do. If the 4 nodes you're talking about are
equal, it might be inefficient to add a 5th so you can have 2 data and 3
master nodes. Maybe for the same budget of adding the 5th you can add 3
small master nodes and keep the 4 as data nodes. Then you'd have
minimum_master_nodes=2. This is the ideal case IMO.
If you don't have lots of data, you can have a setup with 3 nodes: all
master-eligible, only two of them hold data and the 3rd would be a
dedicated master that would act like a tie breaker. The downside is when
both data nodes are super-busy that you won't have a cluster (the tie
breaker won't be able to get a quorum). But then again, if both your data
nodes are unresponsive, having a working cluster has little value.
You can extend this setup with your 4 nodes: all master-eligible, 3 data
and one dedicated master. You'll have to increase minimum_master_nodes to 3
(otherwise you can have a split-brain). Your cluster will still tolerate
one node going down as in the previous case, but you'll have more capacity.
This might be the best bet (capacity vs safety) if you absolutely have to
stick with the 4 servers.
Best regards,
Radu
Performance Monitoring * Log Analytics * Search Analytics
Solr & Elasticsearch Support * http://sematext.com/
On Thu, Jan 8, 2015 at 11:53 AM, phani.nadiminti@goktree.com wrote:
Hi All
I have chosen to establish 4 nodes in my cluster. I read concept of
dedicated master nodes and only data holding nodes in Elasticsearch.please
explain me briefly how can i establish cluster by using the above four
nodes.
suppose if i have chosen N/2+1 for 4 nodes the minimum no of master
nodes would be 3 so one node left in my cluster. master nodes only managing
and indexing data to other nodes i.e data nodes. to implement replica do we
need 5 nodes because i left with only 1 data node where i can keep replica?
other wise will the primary shard resides on any one of master node
and replica will be hold my data node or please explain me how to design
above scenarios with my four nodes in cluster.
Thanks
phani
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