Hi everyone, I am having some issues with upgrading from HAProxy 1.4.18 to 1.5.2 using the same config. With 1.5.2, I am seeing issues where HAProxy is becoming unresponsive a few minutes after I have started it up. When this issue starts to occur the stats page starts to load very slowly (or not at all) and backend servers start to be marked as down even though external monitoring is showing that they are perfectly fine.
After comparing the stats page for 1.4.18 vs 1.5.2, I have noticed that with 1.5.2 the session rate on my backend is very high compared to 1.4.18 (1000+ vs 60) while the current amount of sessions is very low for 1.5.2 and much higher for 1.4.18 (3 vs 1000+). This makes me think that for some reason HAProxy is not respecting http keep alive and is re-establishing every single connection. Another reason behind my thinking, is that HAProxy 1.5.2 seems to work correctly when all references to "mode http" are changed to "mode tcp". I have verified both my backend servers (apache) and the servers infront of HAProxy have the appropriate keep alive headers and are using HTTP 1.1. The sanitized config I am using can be viewed here: http://pastebin.com/2gL4xKu7. Does anyone have any ideas as to why this is occurring? Thanks, Tamim
