Avoid lock contention in hint rows
----------------------------------

                 Key: CASSANDRA-3386
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3386
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
    Affects Versions: 0.7.0
            Reporter: Jonathan Ellis
            Assignee: Jonathan Ellis
             Fix For: 0.8.8, 1.0.1


As pointed out by Yang in CASSANDRA-3385, hint writes are keyed by target IP, 
to make replay efficient. However, this means that we'll hit a lot of lock 
contention in table.apply where we synchronize for potential index updates.

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