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10 Node Cluster for PHP App, is the setup right?

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Thu, 05/24/2012 - 02:07
couchstefan
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Joined: 05/24/2012
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Hi guys,

I am setting up a 10 node cluster and want to check with you if I am on track and doing everything right.

- 10 node cluster
- only Memcached bucket type (I use it as a cache, I do not need replication/persistency)
- 24 GIG of RAM for each node, totals to 240 GIG
- using the new Couchbase PHP Smartclient (based on C libcouchbase)
- using standard port (sasl auth) but no password
- my php constructor looks like: $client = new Couchbase('127.0.0.1:8091', '');
- everything is working

My questions:

- is port 8091 the right one? I saw different ports in the documentation
- is the ip the right one? all my php scripts run on the same nodes as couchbase does
- how is "smart" implemented? I got the concept of the vbucket map but how is it beeing handled since php is "stateless"?
- if my php scripts would run on different nodes than couchbase I guess I could not connect to 127.0.0.1, which IP would I use then? Just one from the 10 nodes? What if this nodes fails, then I am out of luck if the vbucket cache is not kept between requests (how would he know what to do)?

Thanks for your help! :)

Stefan

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Tue, 06/05/2012 - 00:29
ingenthr
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Joined: 03/16/2010
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Port 8091 is correct.

Smart is handled here by doing ketama consistent hashing against the nodes in the cluster. If you add or remove a node, it'll change the server list to match the new topology.

You can pick any one of the 10 nodes to bootstrap from. See the wiki for a PHP snippet on how you can make your client library resilient to failures.

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