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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2013/12/20 00:24:09 UTC
[jira] [Updated] (CASSANDRA-4123) vnodes aware Replication Strategy
[ https://issues.apache.org/jira/browse/CASSANDRA-4123?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jonathan Ellis updated CASSANDRA-4123:
--------------------------------------
Fix Version/s: (was: 2.0.4)
2.1
Assignee: (was: Sam Overton)
Labels: vnodes (was: )
/cc [~tupshin]
> vnodes aware Replication Strategy
> ----------------------------------
>
> Key: CASSANDRA-4123
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4123
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Reporter: Sam Overton
> Labels: vnodes
> Fix For: 2.1
>
>
> The simplest implementation for this would be if NTS regarded a single host as a distinct rack. This would prevent replicas being placed on the same host. The rest of the logic for replica selection would be identical to NTS (but this would be removing a level of topology hierarchy). This would be achievable just by writing a snitch to place hosts in their own rack.
> A better solution would be to add an extra level of hierarchy to NTS so that it still supported DC & rack, and IP would be the new level at the bottom of the hierarchy. The logic would remain largely the same.
> I would very much like to build in Peter Schuller's notion of Distribution Factor (as described in http://www.mail-archive.com/dev@cassandra.apache.org/msg03844.html). This requires a method of defining a "replica set" for each host and then treating it in a similar way to a DC (ie. RF replicas are chosen from that set, instead of from the whole cluster).
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