redis集群出现JedisNoReachableClusterNodeException异常(No reachable node in cluster)

redis.clients.jedis.exceptions.JedisNoReachableClusterNodeException: No reachable node in cluster
    at redis.clients.jedis.JedisSlotBasedConnectionHandler.getConnection(JedisSlotBasedConnectionHandler.java:57)
    at redis.clients.jedis.JedisSlotBasedConnectionHandler.getConnectionFromSlot(JedisSlotBasedConnectionHandler.java:74)
    at redis.clients.jedis.JedisClusterCommand.runWithRetries(JedisClusterCommand.java:116)
    at redis.clients.jedis.JedisClusterCommand.run(JedisClusterCommand.java:31)
    at redis.clients.jedis.JedisCluster.get(JedisCluster.java:124)
    at cn.tbnb1.service.redis.RedisCacheService.get(RedisCacheService.java:55)
    at cn.tbnb1.seckil.controller.SeckillController.resultQuery(SeckillController.java:68)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)

上面是异常，

经过查找代码终于发现，最终是调用JedisCluster.close()方法造成的。

原因：我们使用的是redis3.0的集群，用jedis的JedisCluster.close()方法造成的集群连接关闭的情况。 jedisCluster内部使用了池化技术，每次使用完毕都会自动释放Jedis因此不需要关闭。如果调用close方法后再调用jedisCluster的api进行操作时就会出现如上错误。