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https://issues.apache.org/jira/browse/CASSANDRA-16205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17227818#comment-17227818
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Michael Semb Wever commented on CASSANDRA-16205:
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An offline discussion with [~paulo] came to the following points
- This is an advanced use-case, as the allocation strategy introduced (and
having it defined for RF=3 and {{num_tokens:16}}) is intended to automate and
simplify the operator installation and bootstrap experience. The use of this
script takes away from that, so we shouldn't be encouraging/publicising it. For
this reason the doc page, and the binaries in the packaging {{$PATH}}, has been
removed.
- It would be nice to get json output, so the script was easier to script
against.
- It would be nice to extend the script so it can be used when adding a batch
of nodes to an existing cluster.
- The purpose of the script is to pre-generate tokens for a large number of
nodes, using the exact same algorithm as if the nodes were bootstrapping and
generating their own tokens. With pre-generated tokens bootstrapping nodes
still has to happen sequentially, the exception if {{auto_bootstrap}} is
disabled. Pre-generated tokens may also be useful for configuration management
scripts, and when it's necessary to know the tokens before first starting and
bootstrapping node.
- Splitting the ring into perfectly balanced token rages is another way to
pre-generate tokens. While the ring is perfectly balanced for those nodes, the
allocation strategy generated tokens ensure the ring remains reasonably
balanced as nodes are added/removed. This also means that the script can be
used to pre-generate tokens for more nodes than initially planned for, and the
ring will still be reasonably balanced.
> Offline token allocation strategy generator tool
> ------------------------------------------------
>
> Key: CASSANDRA-16205
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16205
> Project: Cassandra
> Issue Type: Improvement
> Components: Local/Config, Local/Scripts
> Reporter: Michael Semb Wever
> Assignee: Michael Semb Wever
> Priority: Normal
>
> A command line tool to generate tokens (using the
> allocate_tokens_for_local_replication_factor algorithm) for pre-configuration
> of {{initial_tokens}} in cassandra.yaml.
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