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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5220) Repair improvements when using vnodes
Date Fri, 28 Mar 2014 01:19:16 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13950239#comment-13950239
] 

Brandon Williams commented on CASSANDRA-5220:
---------------------------------------------

bq. without vnodes: Repair time: 5.10s

That honestly sounds too fast to be believable to me, when I was tracking the time on the
dtests repair was always one of, if not the, longest one.

> Repair improvements when using vnodes
> -------------------------------------
>
>                 Key: CASSANDRA-5220
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5220
>             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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