[jira] [Commented] (CASSANDRA-13701) Lower default num_tokens

["Jeremy Hanna (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-13701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17171556#comment-17171556 ] 

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

I started down this road but don't think I can get through fixing all of the dtests.  On this line in bootstrap-test.py I changed the time.sleep to 10 seconds and it appears to solve that problem - https://github.com/apache/cassandra-dtest/blob/master/bootstrap_test.py#L485

However there were many tests with replace_address that I'm not sure about.  I don't know how or why replace address would be affected by the new token allocation algorithm.  Dmitri said something about parallel bootstrap but I don't see that - sometimes no_wait or wait_other_notice is true or false so I thought it was that, but perhaps someone more familiar with ccm could see.

I'm sorry - I really want this to get in for the release but I don't have the time to dedicate to learning dtest at a deeper level to fix all of these in time.

> Lower default num_tokens
> ------------------------
>
>                 Key: CASSANDRA-13701
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13701
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Local/Config
>            Reporter: Chris Lohfink
>            Priority: Low
>             Fix For: 4.0-alpha
>
>
> 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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