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From "Jeremiah Jordan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-4123) vnodes aware Replication Strategy
Date Thu, 20 Nov 2014 21:02:34 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-4123?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jeremiah Jordan updated CASSANDRA-4123:
---------------------------------------
    Description: 
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). 


  was:
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). 



> 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: 3.0
>
>
> 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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