Fail to drop not exist table.

[GMHDBJD]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. What did you do? If possible, provide a recipe for reproducing the error.
   DROP TABLE IF NOT EXISTS table_name; while table not exists.
2. What did you expect to see?
   DM work normally.
3. What did you see instead?

"errors": [
{
    "ErrCode": 44007,
    "ErrClass": "schema-tracker",
    "ErrScope": "downstream",
    "ErrLevel": "medium",
    "Message": "startLocation: [position: (test-e108ea4b-e2f8-4ed1-8ca3-e84a4af392c4-j3ds7-k4j1b-bin.000008, 11865), gtid-set: e01311c8-ec19-11ea-9bc6-be6e9048b4d1:1-443], endLocation: [position: (test-e108ea4b-e2f8-4ed1-8ca3-e84a4af392c4-j3ds7-k4j1b-bin.000008, 11999), gtid-set: e01311c8-ec19-11ea-9bc6-be6e9048b4d1:1-443]: cannot fetch downstream table schema of `ha_test`.`ta` to initialize upstream schema `ha_test`.`ta` in schema tracker",
    "RawCause": "Error 1146: Table 'ha_test.ta' doesn't exist",
    "Workaround": ""
}

4. Versions of the cluster

   • DM version (run dmctl -V or dm-worker -V or dm-master -V):

     master
     

This may also happen when replicate drop table statement twice even in safemode. see https://internal.pingcap.net/idc-jenkins/blue/organizations/jenkins/dm_ghpr_test/detail/dm_ghpr_test/6476/pipeline/