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From Anthony Grasso <anthony.gra...@gmail.com>
Subject Re: How to set up a cluster with allocate_tokens_for_keyspace?
Date Mon, 06 May 2019 02:49:34 GMT
Good idea Jeff. I can add that in if you like? Do we have a ticket for it
or should I just raise one?

On Mon, 6 May 2019 at 03:49, Jeff Jirsa <jjirsa@gmail.com> wrote:

> Picking an ideal allocation for N seed nodes and M vnodes per seed is
> probably something we should add as a little python script or similar in
> /tools/ to make this easier. Then let the auto allocation stuff kick in
> after that.
>
>
> > On May 5, 2019, at 8:23 AM, Jon Haddad <jon@jonhaddad.com> wrote:
> >
> > I mean you'd want to set up the initial tokens for the first 3 nodes
> > of your cluster, which are usually the seed nodes.
> >
> >
> > On Sat, May 4, 2019 at 8:31 PM onmstester onmstester
> > <onmstester@zoho.com.invalid> wrote:
> >>
> >> 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.
> >>
> >> Sent using Zoho Mail
> >>
> >>
> >>
> >> ============ Forwarded message ============
> >> From: Jon Haddad <jon@jonhaddad.com>
> >> To: <user@cassandra.apache.org>
> >> 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
> >> <onmstester@zoho.com.invalid> 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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> >>
> >
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