does codis support auto failover?

[jinhao]

hi,
if the master instance down, does codis support auto failover, or it just set a master-slave mode, if the master down ,wo need manual switch the slave as master?

[ngaut]

codis provide restful api to promote slave to master, but it won't do it automatically, you can use your own monitoring system to call restful api :)
Also it's easily to intergrete codis to other system

[jinhao]

@ngaut is the slave and the master use the same vip or when promote slave to master it just change the config of the codis-proxy, and the codis-proxy use a node name like twemproxy for consistent hashing.

[ngaut]

codis doesn't using consistent hashing, which means there will be no cache missing.
client connect to codis-proxy, codis-proxy will do the switching, so master-slave switching is transparent to client

[jsvisa]

@ngaut Hi, I want to use redis-sentinel to monitor codis-server master-slave fallover, here's my strategy: just use redis-sentinel to monitor codis-server, whan a master fails, a slave will be voted to be a master, the strategy is the traditional as redis. But this strategy is not stable as redis, in codis-server's side, the voted codis maybe not the master.

Here is my question, does codis support redis-sentinel for monitoring, if I want to use redis-sentinel, should I rework it hard or not.

[ngaut]

codis does't support redis-sentinel. and we will implement an HA module this seasons.
thanks

[jsvisa]

@ngaut This is an exciting news, look forward to that day