[swssconfig]: Unable to apply large number of config entries in one JSON file

[volodymyrsamotiy]

Description
Unable to apply large number of config entries in one JSON file using swssconfig tool inside ```swss`` docker container.

Steps to reproduce the issue:

1. Prepare JSON file with the 40960 config entries (e.g. VNET route entries were used, but it could any other configuration)
2. Go to swss container and try to apply prepared config: # swssconfig <file>.json
3. Observe that only about 28000 entries were applied and swssconfig thrown an exeption

Describe the results you received:
Only about 28000 entries were applied and swssconfig thrown the following exception:

ERR swss#swssconfig: :- main: Exception caught: Unable to connect to redis: Cannot assign requested address

Apply procedure was just interrupted by the above exception but all were continue working, nothing crashed and even more config can be applied after the exception.

Describe the results you expected:
Expected behavior is to be able to successfully apply large number of config entries (e.g. 40K) using one JSON.

Additional information you deem important (e.g. issue happens only occasionally):
Just use any master based image.

[volodymyrsamotiy]

Reopening this issues since it is observed again on latest 201911 images.

[bingwang-ms]

Same issue is found in lattest master image SONiC.master.447-bef76b10 when applying a large route config file.

Oct 26 05:40:54.180200 str-dx010-acs-4 NOTICE swss#swssconfig: :- main: Loading config from JSON file:/arp_test.json...
Oct 26 05:41:00.540328 str-dx010-acs-4 ERR swss#swssconfig: :- main: Exception caught: Unable to connect to redis: Cannot assign requested address

route_test.zip

[theasianpianist]

@volodymyrsamotiy Can you please upload the VNET routes JSON file that you are using?

[volodymyrsamotiy]

vnet.route.json.txt

@theasianpianist uploaded

[shi-su]

I cannot reproduce this issue with the latest master image on a Mellanox sn3800. I tried the vnet.route.json.txt shared in the comment and a route file with a million routes. @volodymyrsamotiy Could you please help check if it still happens on your end?