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From Ramesh Natarajan <rames...@gmail.com>
Subject node selection for replication factor 3
Date Mon, 03 Oct 2011 21:06:10 GMT
I have 6 nodes in a cluster running RandonPartitioner with SimpleStrategy
and replication factor 3.  Lets say we insert a column with
a QUORUM consistency.
Based on the md5 hash it decides to go to node 10.19.104.11. How does
cassandra pick the other 2 nodes? Is it sequential ( .12 and .13 ) or any
random node?

thanks
Ramesh


root@CAP4-CNode4 apache-cassandra-0.8.6]# ./bin/nodetool -h 127.0.0.1 ring
Address         DC          Rack        Status State   Load            Owns
   Token

   141784319550391026443072753096570088105
10.19.104.11    datacenter1 rack1       Up     Normal  19.92 GB
 16.67%  0
10.19.104.12    datacenter1 rack1       Up     Normal  19.3 GB
16.67%  28356863910078205288614550619314017621
10.19.104.13    datacenter1 rack1       Up     Normal  18.57 GB
 16.67%  56713727820156410577229101238628035242
10.19.104.14    datacenter1 rack1       Up     Normal  19.34 GB
 16.67%  85070591730234615865843651857942052863
10.19.105.11    datacenter1 rack1       Up     Normal  19.88 GB
 16.67%  113427455640312821154458202477256070484
10.19.105.12    datacenter1 rack1       Up     Normal  20 GB
16.67%  141784319550391026443072753096570088105
[root@CAP4-CNode4 apache-cassandra-0.8.6]#

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