session: boostrap delete isolation engines from glo... (#16622) #16802
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Signed-off-by: sre-bot <[email protected]>
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cherry-pick #16622 to release-3.1
What problem does this PR solve?
issue: close #16624
Problem Summary: When tidb-server is upgraded from 3.1-beta to a higher version. There is a
tidb_isolation_read_enginesinmysql.global_variables. It may lead a wrong behavior such as tidb-dashboard can't read the cluster-info table. So we add a new version for bootstrap to delete it.What is changed and how it works?
How it Works: delete the value in
mysql.global_variableswhen tidb-server bootstrap.Related changes
Check List
Tests
Side effects
Release note