Node joins/Node moves should build caches 
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                 Key: CASSANDRA-3321
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3321
             Project: Cassandra
          Issue Type: New Feature
            Reporter: Edward Capriolo
            Priority: Minor


Cassandra use case: high rate of low latency reads served mostly from caches. 
When a new node is joined data is streamed to it. However it is born into a 
'cold world'. It does not have the benefit of saved caches. Clients with 
auto-discovery will find it and start sending requests it's way. If the request 
rate is high enough and clients are aggressive enough the Cassandra node could 
run out of sockets. This feature would build 'best effort' caches possibly by 
sampling entries from the caches of nodes the data was streamed from. With this 
even a newly joined node should have cache warming.

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