tso: optimize the err handling and make their specification consistent (#2878) #2910
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cherry-pick #2878 to release-4.0
Signed-off-by: JmPotato ghzpotato@gmail.com
What problem does this PR solve?
This PR does some optimization for the error handling by defining the error when we first meet it in
tso.What is changed and how it works?
Check List
Tests
Related changes
Release note
tsopkg.