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From "R. Verlangen" <ro...@us2.nl>
Subject Re: nodetool repair -pr enough in this scenario?
Date Tue, 05 Jun 2012 07:32:23 GMT
In your case -pr would be just fine (see Viktor's explanation).

2012/6/5 Viktor Jevdokimov <Viktor.Jevdokimov@adform.com>

>  Understand simple mechanics first, decide how to act later.****
>
> ** **
>
> Without –PR there’s no difference from which host to run repair, it runs
> for the whole 100% range, from start to end, the whole cluster, all nodes,
> at once.****
>
> ** **
>
> With –PR it runs only for a primary range of a node you are running a
> repair.****
>
> Let say you have simple ring of 3 nodes with RF=2 and ranges (per node)
> N1=C-A, N2=A-B, N3=B-C (node tokens are N1=A, N2=B, N3=C). No rack, no DC
> aware.****
>
> So running repair with –PR on node N2 will only repair a range A-B, for
> which node N2 is a primary and N3 is a backup. N2 and N3 will synchronize
> A-B range one with other. For other ranges you need to run on other nodes.
> ****
>
> ** **
>
> Without –PR running on any node will repair all ranges, A-B, B-C, C-A. A
> node you run a repair without –PR is just a repair coordinator, so no
> difference, which one will be next time.****
>
> ** **
>
> ** **
>
>
>    Best regards / Pagarbiai
> *Viktor Jevdokimov*
> Senior Developer
>
> Email: Viktor.Jevdokimov@adform.com
> Phone: +370 5 212 3063, Fax +370 5 261 0453
> J. Jasinskio 16C, LT-01112 Vilnius, Lithuania
> Follow us on Twitter: @adforminsider <http://twitter.com/#!/adforminsider>
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>
> Disclaimer: The information contained in this message and attachments is
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>
>   *From:* David Daeschler [mailto:david.daeschler@gmail.com]
> *Sent:* Tuesday, June 05, 2012 08:59
> *To:* user@cassandra.apache.org
> *Subject:* nodetool repair -pr enough in this scenario?****
>
> ** **
>
> Hello,****
>
> ** **
>
> Currently I have a 4 node cassandra cluster on CentOS64. I have been
> running nodetool repair (no -pr option) on a weekly schedule like:****
>
> ** **
>
> Host1: Tue, Host2: Wed, Host3: Thu, Host4: Fri****
>
> ** **
>
> In this scenario, if I were to add the -pr option, would this still be
> sufficient to prevent forgotten deletes and properly maintain consistency?
> ****
>
> ** **
>
> Thank you,
> - David ****
>



-- 
With kind regards,

Robin Verlangen
*Software engineer*
*
*
W http://www.robinverlangen.nl
E robin@us2.nl

Disclaimer: The information contained in this message and attachments is
intended solely for the attention and use of the named addressee and may be
confidential. If you are not the intended recipient, you are reminded that
the information remains the property of the sender. You must not use,
disclose, distribute, copy, print or rely on this e-mail. If you have
received this message in error, please contact the sender immediately and
irrevocably delete this message and any copies.

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