Hash keys using Jedis locally rather than call cluster keyslot.

Changing the remaining commands in JedisClusterKeyCommands to use the
topology's getKeyServingMasterNode to find the node of key, rather than calling
connection.clusterGetNodeForKey. clusterGetNodeForKey was making a cluster
keyslot call to the server to hash the key, rather than hashing it locally.

Closes: #2156
Original pull request: #2159.

Author: upthewaterspout

src/main/java/org/springframework/data/redis/connection/jedis/JedisClusterKeyCommands.java

@@ -53,6 +53,7 @@
 /**
  * @author Christoph Strobl
  * @author Mark Paluch
+ * @author Dan Smith
  * @since 2.0
  */
 class JedisClusterKeyCommands implements RedisKeyCommands {
@@ -498,7 +499,7 @@ public void restore(byte[] key, long ttlInMillis, byte[] serializedValue, boolea
 			return JedisConverters.toString(this.connection.execute("RESTORE", key,
 					Arrays.asList(JedisConverters.toBytes(ttlInMillis), serializedValue, JedisConverters.toBytes("REPLACE"))));
 
-		}, connection.clusterGetNodeForKey(key));
+		}, connection.getTopologyProvider().getTopology().getKeyServingMasterNode(key));
 	}
 
 	/*
@@ -581,7 +582,7 @@ public ValueEncoding encodingOf(byte[] key) {
 
 		return connection.getClusterCommandExecutor()
 				.executeCommandOnSingleNode((JedisClusterCommandCallback<byte[]>) client -> client.objectEncoding(key),
-						connection.clusterGetNodeForKey(key))
+						connection.getTopologyProvider().getTopology().getKeyServingMasterNode(key))
 				.mapValue(JedisConverters::toEncoding);
 	}
 
@@ -597,7 +598,7 @@ public Duration idletime(byte[] key) {
 
 		return connection.getClusterCommandExecutor()
 				.executeCommandOnSingleNode((JedisClusterCommandCallback<Long>) client -> client.objectIdletime(key),
-						connection.clusterGetNodeForKey(key))
+						connection.getTopologyProvider().getTopology().getKeyServingMasterNode(key))
 				.mapValue(Converters::secondsToDuration);
 	}
 
@@ -613,7 +614,7 @@ public Long refcount(byte[] key) {
 
 		return connection.getClusterCommandExecutor()
 				.executeCommandOnSingleNode((JedisClusterCommandCallback<Long>) client -> client.objectRefcount(key),
-						connection.clusterGetNodeForKey(key))
+						connection.getTopologyProvider().getTopology().getKeyServingMasterNode(key))
 				.getValue();
 
 	}