follower read: add new option for tidb_replica_read (#2252) #2283
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Signed-off-by: qupeng <qupeng@pingcap.com>
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cherry-pick #2252 to release-4.0
What is changed, added or deleted? (Required)
Add an new option for tidb_replica_read.
Which TiDB version(s) do your changes apply to? (Required)
What is the related PR or file link(s)?
pingcap/tidb#15721