场景
大批量提交数据到redis集群服务器中，如直接使用redisTemplate 就会报如下错误：
Pipeline is currently not supported for JedisClusterConnection
原因是:Jedis中JedisCluster是不支持pipeline ，spring-boot-starter-data-Redis用到了pipeline
在org.springframework.data.redis.connection.jedis.JedisClusterConnection.java
openPipeline()方法返回的报错
阅读别人的资料说明了哈希槽(hash slot)
redis cluster一共有16384个桶,用来存储数据，建立集群的时候会返回这样的信息,如下图
数据set时，会用CRC16算法算出一个值，这个值就是对应redisu cluster 的hash slot ，就可以知道这个key存放到那个节点上了
别人的代码，其中我修改了一点，否则是报错的，红色字体
RedisConnectionFactory factory = redisTemplate.getConnectionFactory();
RedisConnection redisConnection = factory.getConnection();
JedisClusterConnection jedisClusterConnection = (JedisClusterConnection) redisConnection;
JedisCluster jedisCluster = jedisClusterConnection.getNativeConnection();
int slot = JedisClusterCRC16.getSlot(key);
Field field = BinaryJedisCluster.class.getDeclaredField("connectionHandler");
field.setAccessible(true);
JedisSlotBasedConnectionHandler jedisClusterConnectionHandler = (JedisSlotBasedConnectionHandler) field.get(jedisCluster);
Jedis jedis = jedisClusterConnectionHandler.getConnectionFromSlot(slot);
Pipeline pipeline = jedis.pipelined();
...
pipeline.syncAndReturnAll();
jedis.close();
RedisConnectionUtils.releaseConnection(redisConnection, factory);
