Node Cluster scheduling policy | Load Balancing for Read Scalability

[Emerson Rocha Luiz]

How (if possible) to use node-cluster to schedule which worker will respond to a request, based on type of request e.g. one worker for write (POST/PUT/DELETE methods)  and 1+ worker only for read (GET)?

This is common on Load Balancing databases, where master server is for Write, and slaves have a carbon copy of the master data and can serve much faster, with less CPU usage and better query cache.

On my NodeJS web service, I have a very fast read requests, even more faster with varnish cache, but with a small and constant amount of write requests, sometimes CPU intensive, lock entire thread by 0.1s~0.3s. In this case, even if I just spawn the node application with both READ/WRITE requests, I will still have the same problem, since each WRITE request will slow down all process. This is why I suppose use the same strategy as some databases could be a good idea.

So, on this type of load balancing (workers scheduling policy based on WRITE/READ request), is possible use node-cluster?

Att.

Emerson

[Ryan Schmidt]

As far as I know, node's built-in cluster does not do anything like that. It just passes incoming requests to an available worker. I don't know if there is any way to influence which worker it uses.

[ala...@bonseletrons.com.br]

Maybe HAproxy can do that, it has some interesting routing options
It may be worth checking



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A 23 de junho de 2015 00:47:02 Ryan Schmidt <googl...@ryandesign.com>
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[Sam Roberts]

On Sun, Jun 21, 2015 at 9:51 PM, Emerson Rocha Luiz <fit...@gmail.com> wrote:
> So, on this type of load balancing (workers scheduling policy based on
> WRITE/READ request), is possible use node-cluster?

node-cluster is for "symetrical" servers: ones in which each server is
identical.

For routing requests based on content, use nginx , and run two apps,
on different ports, one the read-only, the other the write-only. They
can have the same code, just run them separately (each app can use
cluster, which you don't have to embed into your app, use a process
manager, like http://strong-pm.io).