query-status does return some abnormal tasks

[csuzhangxc]

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.

   query-status

2. What did you expect to see?

   all normal or abnormal tasks

3. What did you see instead?

   some abnormal tasks are missing in return

dm-worker-goroutine.txt

Syncer.Status may be blocked for SHOW MASTER STATUS for a long time, but gRPC from DM-master to DM-worker will become timeout in 30s.

4. Versions of the cluster

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

     v2.0.0
     

[csuzhangxc]

another feature request: fast returning (not wait for 30s) with some abnormal DM-worker instances or subtasks (maybe added some new args for query-status)