StackExchange.Redis timeout

Question

Production environment is on Azure, using Redis Cache Standard 2.5GB.

Example 1

System.Web.HttpUnhandledException (0

Answer 1

There are 3 scenarios that can cause timeouts, and it is hard to know which is in play:

1. the library is tripping over; in particular, there are known issues relating to the TLS implementation and how we handle the read loop in the v1.* version of the library - something that we have invested a lot of time working on for v2.* (however: it is not always trivial to update to v2, especially if you're using the library as part of other code that depend on a specific version)
2. the server/network is tripping over; this is a very real possibility - looking at "slowlog" can help if it is server-side, but I don't have any visibility of that
3. the server and network are fine, and the library is doing what it can, but there are some huge blobs flying between client and server that are delaying other operations; this is something that I'm making changes to help identify right now, and if this shows itself to be a common problem, we'll perhaps look at making better use of concurrent connections (which doesn't increase bandwidth, but can reduce latency for blocked operations) - this would be a v2 only change, note