[GitHub] [airflow] potiuk commented on issue #8907: Airflow web UI is slow

[GitBox <gi...@apache.org>]

potiuk commented on issue #8907:
URL: https://github.com/apache/airflow/issues/8907#issuecomment-848169508


   Honestly it looks like some kind of connectivity/configuration problem of your browser/system configuration (and it's very similar with the original request of @sylr). If you look at @sylr screenshot - not only static code there takes ~5s to load but it also takes as long when those are   "cached" already. Also, if you look at the times they are all very similar to each other and for me it looks like this is in an issue with either browser or something on the way - but not Airflow itself.
   
   I'd say you should look at some of your deployment configuration.
   
   In order to verify it, just take a look at logs of the webserver. By default it should show all the requests it gets and how long it took to process them.
   
   The 5/10 seconds delays seem indeed suspiciously like DNS timeout. One thing that COULD happen is indeed DNS timeout if the server or your proxty is trying to run reverse-DNS query on your IP address. I've seen this happening when the server was trying to put names against the IP addresses in the logs but the DNS hanged with timeout on the reverse DNS call. Disabling the IP-> name mapping in the place it's being run should help. 
   
   Quoting @ashb : "It's DNS. It's always DNS."


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