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The "Operations" page has been changed by piavlo:
http://wiki.apache.org/cassandra/Operations?action=diff&rev1=103&rev2=104

  Since Cassandra 1.0 we can replace a dead node with a new one using the 
property "cassandra.replace_token=<Token>", This property can be set using -D 
option while starting cassandra demon process.
  
  (Note:This property will be taken into effect only when the node doesn't have 
any data in it, You might want to empty the data dir if you want to force the 
node replace.)
+ 
+ (Note:Also this property will not be taken into effect if the node is listed 
as seed node in local cassandra.yaml, even if node has no data it will join the 
ring immediately and start serving read/writes right away , a situation you 
want to avoid.)
  
  You must use this property when replacing a dead node (If tried to replace an 
existing live node, the bootstrapping node will throw a Exception). The token 
used via this property must be part of the ring and the node have died due to 
various reasons.
  

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