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From "Jeremy Hanna (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13701) Lower default num_tokens
Date Fri, 21 Jul 2017 01:25:01 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16095638#comment-16095638
] 

Jeremy Hanna commented on CASSANDRA-13701:
------------------------------------------

Adding datacenters with the new algorithm requires some additional configuration.  We would
need to make users aware of that trade-off when using that algorithm and the benefits of fewer
token ranges per node.  It's talked about [here|http://docs.datastax.com/en/dse/5.1/dse-dev/datastax_enterprise/config/configVnodes.html]
but we should make it clearer in the apache docs as well.  We can point to those in the comments
around vnode tokens.

> Lower default num_tokens
> ------------------------
>
>                 Key: CASSANDRA-13701
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13701
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Chris Lohfink
>            Assignee: Chris Lohfink
>            Priority: Minor
>
> For reasons highlighted in CASSANDRA-7032, the high number of vnodes is not necessary.
It is very expensive for operations processes and scanning. Its come up a lot and its pretty
standard and known now to always reduce the num_tokens within the community. We should just
lower the defaults.



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