> On Apr 27, 2021, at 10:47 PM, Jai Bheemsen Rao Dhanwada 
> <jaibheem...@gmail.com> wrote:
> 
> 
> Hello,
> 
> I am currently using num_tokens: 256 in my cluster with the version 3.11.6 
> and when I looked at the Cassandra4.0 I see the num_tokens set to 16. 
> 
> Is there a specific reason for changing the default value from 256 to 16? 
> What is the best value to use ?

Probably something like 16 on new clusters. If you have an existing cluster, 
it’s likely not worth the hassle to change it unless it’s actively causing you 
pain 

> If 16 is recommended, is there a way to change the num_tokens to 16 from 256 
> on the live production cluster?

Not easily, no. You have to add a new data center or similar. Lots of effort. 


> 
> I tried to directly update and restart Cassandra but the process won't 
> startup with the below error
> 
>> org.apache.cassandra.exceptions.ConfigurationException: Cannot change the 
>> number of tokens from 256 to 16
> 
> Any suggestions? 

Change the yaml back to 256 so it starts


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