Hi,

Can someone help me understand why this issue occurs


ovn-controller 23.09.1
Open vSwitch Library 3.2.2

We have an issue with some machines intermittently unable to resolve
DNS for external domains (example dig +noall +answer
harmonic-openai-canada.openai.azure.com)

In the OVN controller log I see the following

2024-05-08T12:12:35.596Z|30138|inc_proc_eng|INFO|node:
logical_flow_output, recompute (missing handler for input SB_dns) took
7950ms
2024-05-08T14:50:29.747Z|30312|inc_proc_eng|INFO|node:
logical_flow_output, recompute (missing handler for input SB_dns) took
8634ms
2024-05-08T14:50:46.673Z|30329|inc_proc_eng|INFO|node:
logical_flow_output, recompute (missing handler for input SB_dns) took
8774ms
2024-05-08T14:54:40.781Z|30353|inc_proc_eng|INFO|node:
logical_flow_output, recompute (missing handler for input SB_dns) took
8535ms
2024-05-08T14:58:43.381Z|30433|inc_proc_eng|INFO|node:
logical_flow_output, recompute (missing handler for input SB_dns) took
8541ms
2024-05-08T14:58:56.802Z|30488|inc_proc_eng|INFO|node:
logical_flow_output, recompute (missing handler for input SB_dns) took
8820ms
2024-05-08T15:02:50.704Z|30512|inc_proc_eng|INFO|node:
logical_flow_output, recompute (missing handler for input SB_dns) took
8739ms
2024-05-08T15:03:05.206Z|30529|inc_proc_eng|INFO|node:
logical_flow_output, recompute (missing handler for input SB_dns) took
8686ms
2024-05-08T15:08:39.441Z|30569|inc_proc_eng|INFO|node:
logical_flow_output, recompute (missing handler for input SB_dns) took
9167ms
2024-05-08T15:09:09.152Z|30603|inc_proc_eng|INFO|node:
logical_flow_output, recompute (missing handler for input SB_dns) took
8985ms
2024-05-08T15:12:14.361Z|30632|inc_proc_eng|INFO|node:
logical_flow_output, recompute (missing handler for input SB_dns) took
8569ms
2024-05-08T15:13:52.535Z|30705|inc_proc_eng|INFO|node:
logical_flow_output, recompute (missing handler for input SB_dns) took
8764ms
2024-05-08T15:14:53.989Z|30732|inc_proc_eng|INFO|node:
logical_flow_output, recompute (missing handler for input SB_dns) took
8802ms
2024-05-08T15:16:30.911Z|30757|inc_proc_eng|INFO|node:
logical_flow_output, recompute (missing handler for input SB_dns) took
8776ms
2024-05-08T15:17:09.371Z|30784|inc_proc_eng|INFO|node:
logical_flow_output, recompute (missing handler for input SB_dns) took
9062ms

Why would this happen and is there something I can do about it ?  Are
there more logs needed ?

Gav
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