node-redis无法通过twemproxy连接到redis实例

Question

问题

直接通过redis-cli连接到我的twemproxy将正确地代理我到redis,没有任何问题/断开连接.但是,当我使用node-redis连接到twemproxy时,我收到以下错误:

[Error: Redis connection gone from end event.]

跟踪如下:

Error: Ready check failed: Redis connection gone from end event.
    at RedisClient.on_info_cmd (/home/vagrant/tests/write-tests/node_mo
dules/redis/index.js:368:35)
    at Command.callback (/home/vagrant/tests/write-tests/node_modules/r
edis/index.js:418:14)
    at RedisClient.flush_and_error (/home/vagrant/tests/write-tests/nod
e_modules/redis/index.js:160:29)
    at RedisClient.connection_gone (/home/vagrant/tests/write-tests/nod
e_modules/redis/index.js:474:10)
    at Socket.<anonymous> (/home/vagrant/tests/write-tests/node_modules
/redis/index.js:103:14)
    at Socket.EventEmitter.emit (events.js:117:20)
    at _stream_readable.js:919:16
    at process._tickCallback (node.js:419:13)

无论redis-server是否正在运行,都会发生此错误,所以我很确定它与node-redis和twemproxy的交互方式有关.或者不根据具体情况进行交互.

我的问题

到底发生了什么？

背景资料

我有一个简单的测试设置,如下所示:

+------------------+
|   +----+----+    |
|   | r1 + r2 +    |
|   +----+----+    |
|     |     |      |
|   +---------+    |
|   |twemproxy|    |
|   +---------+    |
|    /   |   \     |  
| +----+----+----+ |
| | aw | aw | aw | |
| +----+----+----+ |
+------------------+

aw = api worker
r1/r2 = redis instance
twemproxy = twemproxy

• aw目前是集群在同一主机上的nodej
• r1/r2是节点的实例,同样在同一主机上
• 节点版本0.10.x
• 所有三台机器都运行着非常稀疏的流浪文件.为现在的专用网络分配给每个的静态IP.可以从指定端口上的每台其他计算机访问每台计算机.

Answer 1

经过一番挖掘后,我意识到这是因为node_redis在默认情况下尝试在连接上调用"info"命令.

简单地修改连接选项以包含no_ready_check: true将解决此问题并通过twemproxy强制连接.