Clustering, HA, Load Balancing

[Maziz Esa]

Dear all,

I'm having some confusion over the concept of clustering, HA and load balancing in Vertx.

First, I've understood that Vertx is able to load balance multiple instances in single node.

Let's say you have a set up of a cluster of 3 nodes, node A, B and C.

All these are HA enabled.

Clients perform requests on node A. 

My questions are as follow:

1. Since all three nodes are in a cluster, how does the requests being assigned to other nodes in the cluster? (Could it be round robin fashion like in the case of single node with multiple instances?)
   
   
2. From the documentation HA works by automatically restarting vertx instance in another node when failure is detected. So based on the case above, if node A fails, it will start on another node, but will vertx automatically redirect the request from node A to this newly started node?
   
   

Thanks in advance.

Regards,

Maziz.

[Tim Fox]

On 14/07/14 14:15, Maziz Esa wrote:

Dear all,

I'm having some confusion over the concept of clustering, HA and load balancing in Vertx.

First, I've understood that Vertx is able to load balance multiple instances in single node.

Let's say you have a set up of a cluster of 3 nodes, node A, B and C.

All these are HA enabled.

Clients perform requests on node A. 

My questions are as follow:

1. Since all three nodes are in a cluster, how does the requests being assigned to other nodes in the cluster? (Could it be round robin fashion like in the case of single node with multiple instances?)
   

Vert.x doesn't provide any load-balancing of requests across a farm of servers. If you want to do this you would typically use a load balancer (or write a load balancer using Vert.x :) )

1. 
   
2. From the documentation HA works by automatically restarting vertx instance in another node when failure is detected. So based on the case above, if node A fails, it will start on another node, but will vertx automatically redirect the request from node A to this newly started node?
   

Vert.x HA is not related to load balancing.

If you have a load balancer in front of your cluster which connects you with a vert.x server, if that server fails then either the client (or the balancer) will know the connection has been closed and can retry.

1. 
   

Thanks in advance.

Regards,

Maziz.

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[Maziz Esa]

Dear Tim,

Thanks for the prompt response.

One last thing,

Any load balancing solution that you would recommend that can easily be integrated with vertx?

Thanks.

Regards,

Maziz.

[Amit Kumar]

nginx is a good one to start with. http://nginx.org/en/docs/http/load_balancing.html