wehriam / deepstream.io-cluster Goto Github PK

I found the documentation is lacking. Some question I have are: does it support single point of failure?

Hi John,

First off, A big thank you for attempting this clustering plugin. It's obviously not foolproof yet, but should serve as a great starting point for any future work.

I'm currently working on this http://www.st8flo.com. Attempted to use deepstream behind the scenes as a signalling server, and tried using your plugin to cluster 2 nodes, but ran into a bunch of issues that I'd like to try solving.

Would love it if you can give me a primer on the architecture of deepstream & the clustering mechanism that you've used

If I manage to solve anything, will be happy to contribute that code back to your module.

The issues i ran into

1> auto discovery using node-discover seems to be broken.
The error i get is - "Cannot read property clusterNode of undefined".

So instead, I clustered the 2 nodes manually - both set as peers of each other :

2> There's a possible multiplication of state / messaging.

For a distributed indexing / db built on top of st8flo - A query that should've resulted in a 100 items, results in 400,

but only when this clustering plugin is used.

Without clustering it works as expected.

Networking Architecture for cluster test-
2 Deepstream signalling nodes clustered using this plugin (one on Mac, another on linux)

• 1 independent worker machine attached to each signalling node. Worker machines do the actual indexing and storage. Deepstream only acts as an RPC co-ordinator.

Networking architecture normally -
Single deepstream node that acts as signal / RPC server

• Multiple worker machines that connect to it and do the actual indexing / storage.

3> If accidentally disconnected, a signalling node can't reconnect or re-sync state.

Environment -
Deepstream - 3.1.1
Deepstream cluster - 0.6.2
Nodejs - 9.10.1
OS - Mac El Capitan & Linux Ubuntu 14.04

Unfortunately, I can't reproduce this for you to test, since st8flo isn't published yet.
But I can try to figure it out myself, if you help me understand how it works under the hood.

Any pointers / primers ?
Thanks in advance.

Hello!

I was wondering if you would like to have this under the deepstream umbrella with other connectors so that it can be bundled into the binary.

Thanks again for your work on this!

Hi,

I just discovered this promising library and I have two questions :

1. Does this clustering solution work with v4 of deepstream.io, too?
2. Is there a production proofed setup with a specific version of deepstream that you recommend ?

Thank you very much!
Heiko