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From Eric Czech <e...@nextbigsound.com>
Subject Re: unwanted node discovery
Date Sun, 02 Oct 2011 21:59:32 GMT
Hi Shyamal,

I was using the same cluster name but since writing that first email, I've
already had success bringing up nodes in the analysis cluster with a
different cluster name after deleting the LocationInfo* tables.

How have you been setting the tokens in the copied version of the cluster?
 Are you just mapping them one-to-one on the original cluster?

On Sun, Oct 2, 2011 at 3:49 PM, Shyamal Prasad <shyamal@member.fsf.org>wrote:

> >>>>> "Eric" == Eric Czech <eric@nextbigsound.com> writes:
>
>    Eric> We're exploring a data processing procedure where we snapshot
>    Eric> our production cluster data and move that data to a new
>    Eric> cluster for analysis but I'm having some strange issues where
>    Eric> the analysis cluster is still somehow aware of the production
>    Eric> cluster (i.e. the production cluster ring is trying to include
>    Eric> nodes from the other cluster with the same token).
>
> Are you using the same cluster name in for both clusters? If so, I would
> suggest you don't.
>
>    Eric> The seed addresses in cassandra.yaml definitely prohibit this
>    Eric> type of intersection between the two clusters so I'm guessing
>    Eric> that it has something to do with the information in the system
>    Eric> sstables.
>
> I'm sure you will get a more knowledgeable answer from people who have
> been doing this for a while: but I have to ask are copying over the
> LocationInfo* SSTables from the snapshot to the analysis cluster?
>
> The LocationInfo CF can record the endpoints in your production cluster.
> From the little I've read of the code (StorageService.java and
> SystemTable.java) it is possible (likely?) that endpoints from your
> production cluster will get added to your analysis cluster's Gossiper on
> startup. If you are using the same cluster name, well, there you have
> it.....
>
>    Eric> Is there anyway to duplicate raw sstables in an effort to
>    Eric> "copy" a cluster such that the copied cluster has a different
>    Eric> name?  I know this usually results in a "saved cluster name X
>    Eric> != Y" sort of error but it looks like we need to find some
>    Eric> sort of way to do this logical separation.
>
> Copying the raw tables and ignoring/deleting the
> data/system/LocationInfo* files has worked for me. But I have to add the
> disclaimer that I'm definitely a Cassandra newbie!
>
> Cheers!
> Shyamal
>

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