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txn: add a variable to control whether to lock unchanged unique keys #44714

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ekexium opened this issue Jun 15, 2023 · 0 comments · Fixed by #44598
Closed

txn: add a variable to control whether to lock unchanged unique keys #44714

ekexium opened this issue Jun 15, 2023 · 0 comments · Fixed by #44598
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affects-6.5 affects-7.1 severity/major sig/transaction SIG:Transaction type/bug The issue is confirmed as a bug.

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@ekexium
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ekexium commented Jun 15, 2023

Enhancement

#42210 and #42713 introduced the behavior of locking unchanged unique keys in INSERT IGNORE/REPLACE/UPDATE statements.
Locking more keys leads to higher TiKV load and a higher possibility of lock contention.
The performance impact may unexpectedly annoy performance-sensitive applications when they upgrade from an older version. We'd better add a switch to control the behavior.
@ekexium ekexium added type/bug The issue is confirmed as a bug. type/enhancement The issue or PR belongs to an enhancement. severity/major affects-7.1 labels Jun 15, 2023
@ti-chi-bot ti-chi-bot bot added may-affects-5.1 This bug maybe affects 5.1.x versions. may-affects-5.2 This bug maybe affects 5.2.x versions. may-affects-5.3 This bug maybe affects 5.3.x versions. may-affects-5.4 This bug maybe affects 5.4.x versions. may-affects-6.1 may-affects-6.5 labels Jun 15, 2023
@ekexium ekexium mentioned this issue Jun 15, 2023
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@ekexium ekexium added affects-6.5 sig/transaction SIG:Transaction and removed may-affects-5.1 This bug maybe affects 5.1.x versions. may-affects-5.2 This bug maybe affects 5.2.x versions. may-affects-5.3 This bug maybe affects 5.3.x versions. may-affects-5.4 This bug maybe affects 5.4.x versions. may-affects-6.1 may-affects-6.5 type/enhancement The issue or PR belongs to an enhancement. labels Jun 15, 2023
ti-chi-bot bot pushed a commit that referenced this issue Jun 26, 2023
@ekexium
txn: add a variable to control whether to lock unchanged unique keys (#…
3c45737 
…44598)

close #44714
This was referenced Jun 26, 2023
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ti-chi-bot bot pushed a commit that referenced this issue Jun 26, 2023
@ti-chi-bot
txn: add a variable to control whether to lock unchanged unique keys (#…
38ef1f9 
…44598) (#44938)

close #44714
@cfzjywxk cfzjywxk mentioned this issue Jul 20, 2023
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affects-6.5 affects-7.1 severity/major sig/transaction SIG:Transaction type/bug The issue is confirmed as a bug.
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txn: add a variable to control whether to lock unchanged unique keys ekexium/tidb
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