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change tidb_rc_read_check_ts to instance level #37802

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TonsnakeLin opened this issue Sep 14, 2022 · 0 comments · Fixed by #37803
Closed

change tidb_rc_read_check_ts to instance level #37802

TonsnakeLin opened this issue Sep 14, 2022 · 0 comments · Fixed by #37803
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@TonsnakeLin
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Enhancement

System variable tidb_rc_read_check_ts makes the read statements don't get timestamp from PD at RC isolation, which improves TiDB performance. #32922
But we meet a new scenario in core bank service. Some service needs to run when tidb_rc_read_check_ts is on, some service needs to run when tidb_rc_read_check_ts is off. So, we should change system variable from GLOBAL/SESSION to INSTANCE.
Some TiDB instances should run when when tidb_rc_read_check_ts is on. You should add it to the configure file of of this tidb, as below.
[instance]
tidb_rc_read_check_ts = true
Other TiDB instances should do nothing about tidb_rc_read_check_ts in the configure file.
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variables: change tidb_rc_read_check_ts to instance level TonsnakeLin/tidb
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@TonsnakeLin