3. Depends on the change you made to config. Some require reload api (indexing changes), others wait until new segment consumption starts etc (streaming config changes).

Any documentation available ?

What changes are you making? We should add documentation if missing cc: @User

I changed the offset reset from latest to smallest.

changing the offset to latest will not affect anything other than table creation. if you drop the table and re-create it, then it will start consuning from latest (but if you do this, either use a new table name, or let the old table drain completely in terms of externalview, thanks)