How to set up a cluster with allocate_tokens_for_keyspace?

[onmstester onmstester]

I just read this article by tlp:

https://thelastpickle.com/blog/2019/02/21/set-up-a-cluster-with-even-token-distribution.html

 

Noticed that:

>>We will need to set the tokens for the seed nodes in each rack manually. This 
>>is to prevent each node from randomly calculating its own token ranges



 But until now, i was using this recommendation to setup a new cluster:

>>

You'll want to set them explicitly using: python -c 'print( [str(((2**64 / 4) * 
i) - 2**63) for i in range(4)])'


After you fire up the first seed, create a keyspace using RF=3 (or whatever 
you're planning on using) and set allocate_tokens_for_keyspace to that keyspace 
in your config, and join the rest of the nodes. That gives even
distribution.

I've defined plenty of racks in my cluster (and only 3 seed nodes), should i 
have a seed node per rack and use initial_token for all of the seed nodes or 
just one seed node with inital_token would be ok?
Best Regards

nodetool repair failing with "Validation failed in /X.X.X.X

[Rhys Campbell]

> Hello,
> 
> I’m having issues running repair on an Apache Cassandra Cluster. I’m getting 
> "Failed creating a merkle tree“ errors on the replication partner nodes. 
> Anyone have any experience of this? I am running 2.2.13.
> 
> Further details here… 
> https://issues.apache.org/jira/projects/CASSANDRA/issues/CASSANDRA-15109?filter=allopenissues
> 
> Best,
> 
> Rhys


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Re: How to set up a cluster with allocate_tokens_for_keyspace?

[Jon Haddad]

That line is only relevant for when you're starting your cluster and
you need to define your initial tokens in a non-random way.  Random
token distribution doesn't work very well when you only use 4 tokens.

Once you get the cluster set up you don't need to specify tokens
anymore, you can just use allocate_tokens_for_keyspace.

On Sat, May 4, 2019 at 2:14 AM onmstester onmstester
 wrote:
>
> I just read this article by tlp:
> https://thelastpickle.com/blog/2019/02/21/set-up-a-cluster-with-even-token-distribution.html
>
> Noticed that:
> >>We will need to set the tokens for the seed nodes in each rack manually. 
> >>This is to prevent each node from randomly calculating its own token ranges
>
>  But until now, i was using this recommendation to setup a new cluster:
> >>
>
> You'll want to set them explicitly using: python -c 'print( [str(((2**64 / 4) 
> * i) - 2**63) for i in range(4)])'
>
>
> After you fire up the first seed, create a keyspace using RF=3 (or whatever 
> you're planning on using) and set allocate_tokens_for_keyspace to that 
> keyspace in your config, and join the rest of the nodes. That gives even
> distribution.
>
> I've defined plenty of racks in my cluster (and only 3 seed nodes), should i 
> have a seed node per rack and use initial_token for all of the seed nodes or 
> just one seed node with inital_token would be ok?
>
> Best Regards
>
>

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Fwd: Re: How to set up a cluster with allocate_tokens_for_keyspace?

[onmstester onmstester]

So do you mean setting tokens for only one node (one of the seed node) is fair 
enough?

 I can not see any problem with this mechanism (only one manual token 
assignment at cluster set up), but the article was also trying to set up a 
balanced cluster and the way that it insist on doing manual token assignment 
for multiple seed nodes, confused me.



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 Forwarded message 

From: Jon Haddad 

To: 

Date: Sat, 04 May 2019 22:10:39 +0430

Subject: Re: How to set up a cluster with allocate_tokens_for_keyspace?

 Forwarded message 




That line is only relevant for when you're starting your cluster and 

you need to define your initial tokens in a non-random way.  Random 

token distribution doesn't work very well when you only use 4 tokens. 

 

Once you get the cluster set up you don't need to specify tokens 

anymore, you can just use allocate_tokens_for_keyspace. 

 

On Sat, May 4, 2019 at 2:14 AM onmstester onmstester 

 wrote: 

> 

> I just read this article by tlp: 

> https://thelastpickle.com/blog/2019/02/21/set-up-a-cluster-with-even-token-distribution.html
>  

> 

> Noticed that: 

> >>We will need to set the tokens for the seed nodes in each rack manually. 
> >>This is to prevent each node from randomly calculating its own token ranges 

> 

>  But until now, i was using this recommendation to setup a new cluster: 

> >> 

> 

> You'll want to set them explicitly using: python -c 'print( [str(((2**64 / 4) 
> * i) - 2**63) for i in range(4)])' 

> 

> 

> After you fire up the first seed, create a keyspace using RF=3 (or whatever 
> you're planning on using) and set allocate_tokens_for_keyspace to that 
> keyspace in your config, and join the rest of the nodes. That gives even 

> distribution. 

> 

> I've defined plenty of racks in my cluster (and only 3 seed nodes), should i 
> have a seed node per rack and use initial_token for all of the seed nodes or 
> just one seed node with inital_token would be ok? 

> 

> Best Regards 

> 

> 

 

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