tomcat nodes and updating of webapps

[Miguel Gonzalez <mi...@yahoo.es>]

Dear all,
 
  In the Tomcat nodes (under Windows) i mentioned in the other thread part of balancing group we are concerned of how to face webapps updating.
 
  What I mean is if I have just 2-3 nodes, while we are performing a new webapp deployment, we would like that users continue to be served using the non-updated webapps of course, transparently for them and with no downtimes.
 
  I have thought about it and I have thought of having two tomcats in each server node that are synced and a second failover Tomcat in server1 which will take all requests while the main Tomcat in server1 is being updated.
 
  Does it make sense?
 
  Thanks,
 
  Miguel

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Re: tomcat nodes and updating of webapps

[Christopher Schultz <ch...@christopherschultz.net>]

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Miguel,

On 4/4/13 6:48 AM, Miguel Gonzalez wrote:
> In the Tomcat nodes (under Windows) i mentioned in the other
> thread part of balancing group we are concerned of how to face
> webapps updating.

In the future, put all the information a reader needs to understand
your question in a single post. Otherwise, you run the risk of lazy
people (like me) not bothering to go hunting for your other post just
to get the back-story. (It also irritates archive-hunters). So, I'm
proceeding with no existing information, other than you probably have
a load-balanced Tomcat configuration.

> What I mean is if I have just 2-3 nodes, while we are performing a 
> new webapp deployment, we would like that users continue to be
> served using the non-updated webapps of course, transparently for
> them and with no downtimes.

Are you using sticky sessions and does the load-balancer stick them
properly? If so, enable Tomcat's parallel deployment and do your
deployments "properly" according to those rules. You can update any
server at any time you want. Don't forget to undeploy the old
version(s) after users sessions expire.

You could also couple that with the "farm web deployer" which I myself
have never used.

> I have thought about it and I have thought of having two tomcats
> in each server node that are synced and a second failover Tomcat
> in server1 which will take all requests while the main Tomcat in
> server1 is being updated.
> 
> Does it make sense?

You could do that, but I think it's just more work with little benefit.

- -chris
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