*: separate auto_increment ID allocator from _tidb_rowid allocator #20708
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What problem does this PR solve?
Issue Number: close #982
Problem Summary: before this PR, auto_increment ID and
_tidb_rowid
share the same key-value. The problem is any action that affectsauto_increment
column also has an impact on_tidb_rowid
. For example,The first insert statement forces auto_increment ID rebase to
9223372036854775807
. Even if the second insert statement does not trigger auto_increment ID allocation, TiDB throws an "Failed to read" error because the_tidb_rowid
allocator is exhausted.What is changed and how it works?
What's Changed:
TiDB behavior changes:
ALTER TABLE ... AUTO_INCREMENT = ?
will not affect_tidb_rowid
allocation anymore.@@auto_increment_increment
and@@auto_increment_offset
will not affect_tidb_rowid
allocation anymore.AUTO_ID_CACHE
keeps unchanged(AUTO_ID_CACHE
still affects_tidb_rowid
allocation).Related changes
pingcap/docs
/pingcap/docs-cn
:Check List
Tests
Side effects
Release note