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 <shya...@member.fsf.org>wrote: > >>>>> "Eric" == Eric Czech <e...@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 >
