openconfig-interfaces problem with empty counters

[sfuhrm]

When trying to get the list of OpenConfig interfaces, I get a 404 errror which reads more like an internal application problem:

$ curl -I -k -X GET "https://$IP/restconf/data/openconfig-interfaces:interfaces" -H  "accept: application/yang-data+json"
HTTP/2 404 
content-type: application/yang-data+json
content-length: 127
date: Fri, 30 Sep 2022 09:18:55 GMT

$ curl -k -X GET "https://$IP/restconf/data/openconfig-interfaces:interfaces" -H  "accept: application/yang-data+json"
{"ietf-restconf:errors":{"error":[{"error-type":"application","error-tag":"invalid-value","error-message":"Entry not found"}]}}

Using "strace" shows that the problem is related to a COUNTERS_PORT_NAME_MAP item in Redis:

[pid 12369] write(2, "E0930 09:47:56.851061      18 in"..., 102) = 102
 | 00000  45 30 39 33 30 20 30 39  3a 34 37 3a 35 36 2e 38  E0930 09:47:56.8 |
 | 00010  35 31 30 36 31 20 20 20  20 20 20 31 38 20 69 6e  51061      18 in |
 | 00020  74 66 5f 61 70 70 2e 67  6f 3a 37 31 39 5d 20 50  tf_app.go:719] P |
 | 00030  6f 72 74 2d 4f 49 44 20  28 43 6f 75 6e 74 65 72  ort-OID (Counter |
 | 00040  73 29 20 67 65 74 20 66  6f 72 20 61 6c 6c 20 74  s) get for all t |
 | 00050  68 65 20 69 6e 74 65 72  66 61 63 65 73 20 66 61  he interfaces fa |
 | 00060  69 6c 65 64 21 0a                                 iled!.           |
[pid 12369] epoll_ctl(4, EPOLL_CTL_DEL, 9, 0xc0057b2ae4) = 0
[pid 12369] close(9)                    = 0
[pid 12369] epoll_ctl(4, EPOLL_CTL_DEL, 10, 0xc0057b2ae4) = 0
[pid 12369] close(10)                   = 0
[pid 12369] write(2, "E0930 09:47:56.851635      18 ha"..., 178) = 178
 | 00000  45 30 39 33 30 20 30 39  3a 34 37 3a 35 36 2e 38  E0930 09:47:56.8 |
 | 00010  35 31 36 33 35 20 20 20  20 20 20 31 38 20 68 61  51635      18 ha |
 | 00020  6e 64 6c 65 72 2e 67 6f  3a 35 39 5d 20 5b 52 45  ndler.go:59] [RE |
 | 00030  53 54 2d 33 33 5d 20 54  72 61 6e 73 6c 69 62 20  ST-33] Translib  |
 | 00040  65 72 72 6f 72 20 74 6c  65 72 72 2e 54 72 61 6e  error tlerr.Tran |
 | 00050  73 6c 69 62 52 65 64 69  73 43 6c 69 65 6e 74 45  slibRedisClientE |
 | 00060  6e 74 72 79 4e 6f 74 45  78 69 73 74 20 2d 20 54  ntryNotExist - T |
 | 00070  72 61 6e 73 6c 69 62 20  52 65 64 69 73 20 45 72  ranslib Redis Er |
 | 00080  72 6f 72 3a 20 45 6e 74  72 79 20 64 6f 65 73 20  ror: Entry does  |
 | 00090  6e 6f 74 20 65 78 69 73  74 3a 20 43 4f 55 4e 54  not exist: COUNT |
 | 000a0  45 52 53 5f 50 4f 52 54  5f 4e 41 4d 45 5f 4d 41  ERS_PORT_NAME_MA |
 | 000b0  50 0a                                             P.               |
[pid 12369] write(2, "I0930 09:47:56.851940      18 ha"..., 243) = 243
 | 00000  49 30 39 33 30 20 30 39  3a 34 37 3a 35 36 2e 38  I0930 09:47:56.8 |
 | 00010  35 31 39 34 30 20 20 20  20 20 20 31 38 20 68 61  51940      18 ha |
 | 00020  6e 64 6c 65 72 2e 67 6f  3a 37 32 5d 20 5b 52 45  ndler.go:72] [RE |
 | 00030  53 54 2d 33 33 5d 20 53  65 6e 64 69 6e 67 20 72  ST-33] Sending r |
 | 00040  65 73 70 6f 6e 73 65 20  34 30 34 2c 20 74 79 70  esponse 404, typ |
 | 00050  65 3d 61 70 70 6c 69 63  61 74 69 6f 6e 2f 79 61  e=application/ya |
 | 00060  6e 67 2d 64 61 74 61 2b  6a 73 6f 6e 2c 20 64 61  ng-data+json, da |
 | 00070  74 61 3d 7b 22 69 65 74  66 2d 72 65 73 74 63 6f  ta={"ietf-restco |
 | 00080  6e 66 3a 65 72 72 6f 72  73 22 3a 7b 22 65 72 72  nf:errors":{"err |
 | 00090  6f 72 22 3a 5b 7b 22 65  72 72 6f 72 2d 74 79 70  or":[{"error-typ |
 | 000a0  65 22 3a 22 61 70 70 6c  69 63 61 74 69 6f 6e 22  e":"application" |
 | 000b0  2c 22 65 72 72 6f 72 2d  74 61 67 22 3a 22 69 6e  ,"error-tag":"in |
 | 000c0  76 61 6c 69 64 2d 76 61  6c 75 65 22 2c 22 65 72  valid-value","er |
 | 000d0  72 6f 72 2d 6d 65 73 73  61 67 65 22 3a 22 45 6e  ror-message":"En |
 | 000e0  74 72 79 20 6e 6f 74 20  66 6f 75 6e 64 22 7d 5d  try not found"}] |
 | 000f0  7d 7d 0a                                          }}.              |
[pid 12369] write(2, "I0930 09:47:56.852237      18 ro"..., 106) = 106
 | 00000  49 30 39 33 30 20 30 39  3a 34 37 3a 35 36 2e 38  I0930 09:47:56.8 |
 | 00010  35 32 32 33 37 20 20 20  20 20 20 31 38 20 72 6f  52237      18 ro |
 | 00020  75 74 65 72 2e 67 6f 3a  31 32 38 5d 20 5b 52 45  uter.go:128] [RE |
 | 00030  53 54 2d 33 33 5d 20 47  65 74 4f 70 65 6e 63 6f  ST-33] GetOpenco |
 | 00040  6e 66 69 67 49 6e 74 65  72 66 61 63 65 73 49 6e  nfigInterfacesIn |
 | 00050  74 65 72 66 61 63 65 73  20 74 6f 6f 6b 20 33 37  terfaces took 37 |
 | 00060  2e 31 38 35 34 39 33 6d  73 0a                    .185493ms.       |

The counter table is empty:

root@sonic:~# redis-cli 
127.0.0.1:6379> hgetall COUNTERS_PORT_NAME_MAP
(empty array)

So I presume that

sonic-mgmt-common/translib/intf_app.go

Line 717 in ec32690

ifCountInfo, err := dbCl.GetMapAll(app.portOidCountrTblTs)

fails because of

sonic-mgmt-common/translib/db/map.go

Line 70 in ec32690

if len(v) != 0 {

I'm running this against a nightly VM image (sonic-vs.img).