meta: make auto id minimum step larger (#12873)#12891
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cherry-pick #12873 to release-2.1
What problem does this PR solve?
Originally, the default minimum step of auto id is 1000. This may cause too many transaction for applying auto id when there are many write request suddenly.
What is changed and how it works?
Make minimum step of auto id larger. Every TiDB server will cache at least 30000 auto id.
Check List
Tests
Code changes
Side effects
Related changes
Release note