cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Branimir Lambov (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-12777) Optimize the vnode allocation for single replica per DC
Date Thu, 20 Oct 2016 07:58:58 GMT


Branimir Lambov commented on CASSANDRA-12777:

I'm sorry, the flake appears to be caused by CASSANDRA-12812. Could you please roll back the
change to {{}}?

The patch is otherwise ready to commit.

> Optimize the vnode allocation for single replica per DC
> -------------------------------------------------------
>                 Key: CASSANDRA-12777
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Dikang Gu
>            Assignee: Dikang Gu
>             Fix For: 3.x
> The new vnode allocation algorithm introduced in CASSANDRA-7032 is optimized for the
situation that there are multiple replicas per DC.
> In our production environment, most cluster only has one replica, in this case, the algorithm
does not work perfectly. It always tries to split token ranges by half, so that the ownership
of "min" node could go as low as ~60% compared to avg.
> So for single replica case, I'm working on a new algorithm, which is based on Branimir's
previous commit, to split token ranges by "some" percentage, instead of always by half. In
this way, we can get a very small variation of the ownership among different nodes.

This message was sent by Atlassian JIRA

View raw message