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From "Jonathan Ellis (JIRA)" <>
Subject [jira] [Resolved] (CASSANDRA-3121) How to know which servers to replication
Date Fri, 02 Sep 2011 01:54:09 GMT


Jonathan Ellis resolved CASSANDRA-3121.

       Resolution: Not A Problem
    Fix Version/s:     (was: 0.8.4)

(a) there is no primary / backup distinction in cassandra

(b) if your app cares about which nodes hold a given row you are almost certainly doing it
wrong, but the right place to have that discussion is the user mailing list

> How to know which servers to replication
> ----------------------------------------
>                 Key: CASSANDRA-3121
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Tools
>    Affects Versions: 0.8.4
>         Environment: Cassandra0.7.5 and Cassandra0.8.4
>            Reporter: deng
> When we create keysapce we can  set  replication_factor , Assuming the cluster has five
machines here.Node1,Node2,Node3,Node4,Node5. when I create keypsace at Node1 server and set
replication_factor =3 ,it means that it will choose 2 servers to backup.
> My question is that how we can know which 2 nodes are choosed to backup ? I can not find
this answer at Cassandra0.7.5 or Cassandra0.8.4.

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