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From "Marcus Olsson (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-5220) Repair improvements when using vnodes
Date Tue, 04 Aug 2015 09:53:07 GMT


Marcus Olsson commented on CASSANDRA-5220:

Sorry about the unit tests, I had some problems with ant and junit when I uploaded the patch
so I ran those tests through eclipse and it seems that I missed the -ea flag. Also the tests
in SerializationsTest seems to be broken(due to the changes for validations). The other two
failing tests seems to be failing on trunk as well, so I'm assuming that it's not due to this

I'm working based on your rebased branch 5220 and have fixed the unit tests [here|].

Also I seem to be having some problems with running the dtests, is it something special that
needs to be done to run the dtests on trunk? I get the following error message:
NoHostAvailable: ('Unable to connect to any servers', {'': InvalidRequest(u'code=2200
[Invalid query] message="unconfigured table schema_keyspaces"',)})

> 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: Marcus Olsson
>              Labels: performance, repair
>         Attachments: 5220-yourkit.png, 5220-yourkit.tar.bz2, cassandra-3.0-5220-1.patch,
cassandra-3.0-5220-2.patch, cassandra-3.0-5220.patch
> 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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