Saving IndexSummaries to disk
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                 Key: CASSANDRA-2392
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2392
             Project: Cassandra
          Issue Type: Improvement
    Affects Versions: 0.8
            Reporter: Chris Goffinet
            Priority: Minor


For nodes with millions of keys, doing rolling restarts that take over 10 
minutes per node can be painful if you have 100 node cluster. All of our time 
is spent on doing index summary computations on startup. It would be great if 
we could save those to disk as well. Our indexes are quite large.

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