How to scale VoltDB on 3 machines

Question

I am new to VoltDB and working on a college research project. For that I need to run VoltDB on multiple nodes. Currently, I have 3 Ubuntu 16.04 VMs on Azure cloud. Each with 8 vCPUs, 200GB storage, 32 GB ram. All of them has VoltDB 8.1.1 community edition running on them indepently.

I need to know the steps how to combine them as 1 cluster. I tried modifying deployment.xml kfactor 3 but not able make 1 cluster.

Please guide me with steps on how to achieve horizontal scaling of VoltDB using community edition.

In future, I am trying add at least 12 more nodes to the cluster.

Any help is appreciated!!!

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Andrew Andrew · Accepted Answer · 2018-06-14T20:24:49

What does your deployment.xml file look like? An example of a deployment file that can work for a 3 node cluster is below:

<deployment>
   <cluster hostcount="3" kfactor="1"/>
   <httpd enabled="true">
      <jsonapi enabled="true" />
   </httpd>
</deployment>

After initializing with voltdb init:

voltdb init --force --config=deployment.xml

You can start the cluster:

voltdb start --host=server1,server2,server3

Note that server1, server2, and server3 should be replaced with either a unique host name or IP address. What these are will depend on your Azure setup.

Kfactor is not the same as the number of nodes. It is the maximum number of nodes that can die before the cluster shuts down entirely. More information on it can be found here:

https://docs.voltdb.com/UsingVoltDB/KSafeEnable.php

Disclosure: I work at VoltDB

How to scale VoltDB on 3 machines

1 Answers