Manual control connect or disconnect behavior at runtime

[jiayuzhang]

Hi, we have a service to migrate from cluster A to cluster B, both clusters will establish a lot of Redis connections (>20k), we have bumped the conn limit on the Redis side, but the latency/performance is degraded.

One idea is, while we migrate traffic from A to B, we could notify instances in cluster A (e.g. via API) to disconnect, later if something bad happens, we could ask A to reconnect, and route traffic back.

Wrt reconnect/disconnect, one naive way is we can manually call the client.connect() and redisConn.close(), but there could be race conditions while we route traffic back during re-connecting, so we probably need some locks to let caller waits until the client finishes re-connect.

I'm wondering if there is a better way Lettuce can provide. thanks