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https://issues.apache.org/jira/browse/CASSANDRA-2019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12984309#action_12984309
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Jonathan Ellis commented on CASSANDRA-2019:
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Thanks for the patch, Yang!
CASSANDRA-1669 already solves 1) in 0.8. We could backport that to the 0.7
branch.
CASSANDRA-957 is open for 2), scheduled for fix in 0.8. Maybe we could add
setInitialToken as a temporary workaround, but by the time you call
setInitialToken isn't it already starting to bootstrap with the value from the
config file? I think you'd need CASSANDRA-526 to make this useful.
> add interface to DatabaseDescriptor to help setting seeds and tokens at boot
> time (for EC2 feature)
> ---------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-2019
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2019
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Affects Versions: 0.7.0
> Reporter: Yang Yang
> Fix For: 0.7.1
>
>
> 1)
> in the amazon EC2 environment, machines die off and more frequently, and new
> instances are brought up more often, so even if we list out all the nodes in
> the ring as seeds, all of these seeds may have gradually died off after some
> time. at that time , new nodes joining won't be able to find the existing
> ring, and will establish a new, separate ring of the same name, which is
> wrong.
> we have made some custom code that utilizes external systems to figure out
> the EC2 autoscaler group, and at boot time feed this info to the new node.
> but this requires the new node to be able to modify the seeds at boot time.
> right now the DatabaseDescriptor only has a getSeeds() method, we would like
> to add a setSeeds()
> 2) similarly, for the token-1 trick, we wrote code to do this automatically.
> the StorageService.initServer() code reads the initialToken at boot time, we
> need to be able to modify this at boot time. so we would like to add
> DatabaseDescriptor.setInitialToken()
> patch attached.
> also theoretically we could do both just by modifying the config file, but
> that requires running a separate process before cassandra daemon starts,
> which is not as clean.
> Thanks a lot
> Yang
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