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From "Richard Low (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-5220) Repair improvements when using vnodes
Date Tue, 15 Apr 2014 15:22:20 GMT


Richard Low commented on CASSANDRA-5220:

It's going to be a lot slower when there's little data because there is num_tokens times as
much work to do. But when there is lots of data the times should be pretty much independent
of num_tokens because most of repair is spent reading data and hashing. I ran some tests when
we were developing vnodes (sorry, I don't have the data still available) and this was the
case. Something might have regressed though.

> Repair improvements when using vnodes
> -------------------------------------
>                 Key: CASSANDRA-5220
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 1.2.0 beta 1
>            Reporter: Brandon Williams
>            Assignee: Yuki Morishita
>             Fix For: 2.1 beta2
> Currently when using vnodes, repair takes much longer to complete than without them.
 This appears at least in part because it's using a session per range and processing them
sequentially.  This generates a lot of log spam with vnodes, and while being gentler and lighter
on hard disk deployments, ssd-based deployments would often prefer that repair be as fast
as possible.

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