Dumpling cannot export tables on tidb-cloud better

[glkappe]

What did you do?

dumpling part table on tidb-cloud(dbaas).
gc_life_time not support auto set when dumpling can't ping pd-server

What did you expect to see?

gc_life_time can be set adaptively

What did you see instead?

As gc progresses, dumpling exports an error

Versions of the cluster

v5.4.0

[lichunzhu]

dumpling will report log on how to set gc_lifetime when it fails to ping pd-server. It's an expected behavior.