unnecessary locking in hint path due to InetAddress.getLocalhost()
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                 Key: CASSANDRA-3387
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3387
             Project: Cassandra
          Issue Type: Bug
            Reporter: Yang Yang
            Priority: Minor


in tests we found locking contention also due to the following




Stacks at 01:49:19 PM (uptime 10:54)


MutationStage:62 [BLOCKED] CPU time: 0:06
java.net.InetAddress.getLocalHost()
org.apache.cassandra.utils.UUIDGen.getClockSeqAndNode()
org.apache.cassandra.utils.UUIDGen.createTimeUUIDBytes(long)
org.apache.cassandra.utils.UUIDGen.getTimeUUIDBytes()
org.apache.cassandra.db.RowMutation.hintFor(RowMutation, ByteBuffer)
org.apache.cassandra.service.StorageProxy$4.run()
java.lang.Thread.run()





we can easily change every getLocalHost() call to use a cached value

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