[DB Migrator] DB Migration from 202012 to 202205 does not work

[dgsudharsan]

Description

The latest 202012 has DB migrator version as 2_0_2. However there is no handler for this version in 202205

Nov 8 03:30:48 sonic config-setup[3464]: Running command: /usr/local/bin/db_migrator.py -o migrate
Nov 8 03:30:48 sonic config-setup[3464]: Running command: /usr/local/bin/db_migrator.py -o migrate
Nov 8 03:30:48 sonic mellanox_buffer_migrator: Caught exception: 'DBMigrator' object has no attribute 'version_2_0_2'
Nov 8 03:30:48 sonic mellanox_buffer_migrator: Caught exception: 'DBMigrator' object has no attribute 'version_2_0_2'
Nov 8 03:30:48 sonic config-setup[3988]: Traceback (most recent call last):
Nov 8 03:30:48 sonic config-setup[3988]: Traceback (most recent call last):
Nov 8 03:30:48 sonic config-setup[3988]: File "/usr/local/bin/db_migrator.py", line 816, in main
Nov 8 03:30:48 sonic config-setup[3988]: File "/usr/local/bin/db_migrator.py", line 816, in main
Nov 8 03:30:48 sonic config-setup[3988]: result = getattr(dbmgtr, operation)()
Nov 8 03:30:48 sonic config-setup[3988]: result = getattr(dbmgtr, operation)()
Nov 8 03:30:48 sonic config-setup[3988]: File "/usr/local/bin/db_migrator.py", line 768, in migrate
Nov 8 03:30:48 sonic config-setup[3988]: File "/usr/local/bin/db_migrator.py", line 768, in migrate
Nov 8 03:30:48 sonic config-setup[3988]: next_version = getattr(self, version)()
Nov 8 03:30:48 sonic config-setup[3988]: next_version = getattr(self, version)()
Nov 8 03:30:48 sonic config-setup[3988]: AttributeError: 'DBMigrator' object has no attribute 'version_2_0_2'
Nov 8 03:30:48 sonic config-setup[3988]: AttributeError: 'DBMigrator' object has no attribute 'version_2_0_2'
Nov 8 03:30:48 sonic config-setup[3464]: 'DBMigrator' object has no attribute 'version_2_0_2'
Nov 8 03:30:48 sonic config-setup[3464]: 'DBMigrator' object has no attribute 'version_2_0_2'
Nov 8 03:30:48 sonic config-setup[3464]: usage: db_migrator.py [-h] [-o operation migrate, set_version, get_version]
Nov 8 03:30:48 sonic config-setup[3464]: usage: db_migrator.py [-h] [-o operation migrate, set_version, get_version]
Nov 8 03:30:48 sonic config-setup[3464]: [-s unix socket] [-n asic namespace]
Nov 8 03:30:48 sonic config-setup[3464]: [-s unix socket] [-n asic namespace]

Steps to reproduce the issue:

1. ONIE install 202012
2. Upgrade to 202205
3. Perform config reload (to see it fails due to db_migration failure)

Describe the results you received:

DB migration fails from 202012 to 202205

Describe the results you expected:

DB migration should succeed from 202012 to 202205

Output of show version:

SONiC Software Version: SONiC.202205.56-9d7c23b85_Internal
Distribution: Debian 11.5
Kernel: 5.10.0-12-2-amd64
Build commit: 9d7c23b85
Build date: Sun Nov  6 10:58:02 UTC 2022
Built by: sw-r2d2-bot@r-build-sonic02-006

Platform: x86_64-mlnx_msn3420-r0
HwSKU: ACS-MSN3420
ASIC: mellanox
ASIC Count: 1
Serial Number: MT2012X01822
Model Number: MSN3420-CB2FO
Hardware Revision: A1
Uptime: 08:32:18 up 53 min,  1 user,  load average: 0.25, 0.15, 0.37
Date: Tue 08 Nov 2022 08:32:18

Docker images:
REPOSITORY                                         TAG                            IMAGE ID       SIZE
docker-orchagent                                   202205.56-9d7c23b85_Internal   ae366854e594   478MB
docker-orchagent                                   latest                         ae366854e594   478MB
docker-fpm-frr                                     202205.56-9d7c23b85_Internal   877eaadfcb60   489MB
docker-fpm-frr                                     latest                         877eaadfcb60   489MB
docker-teamd                                       202205.56-9d7c23b85_Internal   10b3205a723d   459MB
docker-teamd                                       latest                         10b3205a723d   459MB
docker-macsec                                      latest                         15c1a0957d3a   461MB
docker-syncd-mlnx                                  202205.56-9d7c23b85_Internal   994cc767b233   862MB
docker-syncd-mlnx                                  latest                         994cc767b233   862MB
docker-platform-monitor                            202205.56-9d7c23b85_Internal   02dc563449a7   867MB
docker-platform-monitor                            latest                         02dc563449a7   867MB
docker-dhcp-relay                                  latest                         df1210911be2   453MB
docker-snmp                                        202205.56-9d7c23b85_Internal   52bfe1fdabe8   488MB
docker-snmp                                        latest                         52bfe1fdabe8   488MB
docker-sonic-telemetry                             202205.56-9d7c23b85_Internal   7e65df200335   524MB
docker-sonic-telemetry                             latest                         7e65df200335   524MB
docker-lldp                                        202205.56-9d7c23b85_Internal   be05dd25bdd4   486MB
docker-lldp                                        latest                         be05dd25bdd4   486MB
docker-database                                    202205.56-9d7c23b85_Internal   75ac53bddd6a   443MB
docker-database                                    latest                         75ac53bddd6a   443MB
docker-mux                                         202205.56-9d7c23b85_Internal   7ac3daeee27e   492MB
docker-mux                                         latest                         7ac3daeee27e   492MB
docker-router-advertiser                           202205.56-9d7c23b85_Internal   ac52d866ddfc   443MB
docker-router-advertiser                           latest                         ac52d866ddfc   443MB
docker-nat                                         202205.56-9d7c23b85_Internal   a27a550a54fa   431MB
docker-nat                                         latest                         a27a550a54fa   431MB
docker-sflow                                       202205.56-9d7c23b85_Internal   5ccf1d66de23   429MB
docker-sflow                                       latest                         5ccf1d66de23   429MB
docker-sonic-mgmt-framework                        202205.56-9d7c23b85_Internal   19127c412439   558MB
docker-sonic-mgmt-framework                        latest                         19127c412439   558MB
urm.nvidia.com/sw-nbu-sws-sonic-docker/sonic-wjh   1.3.0-internal-25              06ae46e1ece1   643MB

Output of show techsupport:

sonic_dump_r-lionfish-07_20221108_083208.tar.gz

Additional information you deem important (e.g. issue happens only occasionally):