*: move config file option tidb_txn_total_size_limit and tidb_txn_entry_size_limit to sysvar by Alkaagr81 · Pull Request #34448 · pingcap/tidb

Alkaagr81 · 2022-05-07T08:56:02Z

What problem does this PR solve?

Issue Number: ref #33769

Problem Summary:

The option tidb_txn_total_size_limit and tidb_txn_entry_size_limit has historically been a config option. But based on requirements from cloud & PM it should instead be a sysvar scope Global.

What is changed and how it works?

Remove them from the config list and add them to global sysvars.

Check List

Tests

Unit test
Integration test
Manual test (add detailed scripts or steps below)
No code

Side effects

Performance regression: Consumes more CPU
Performance regression: Consumes more Memory
Breaking backward compatibility

Documentation

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

The option `tidb_txn_total_size_limit` and `tidb_txn_entry_size_limit`  has historically been a config option. But based on requirements from cloud & PM it should instead be a sysvar scope Global.

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ti-chi-bot · 2022-05-07T08:56:04Z

[REVIEW NOTIFICATION]

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morgo
you06

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config/config.toml.example

config/config.go

executor/seqtest/seq_executor_test.go

server/server_test.go

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you06

rest LGTM

sessionctx/variable/sysvar.go

morgo · 2022-05-12T19:12:57Z

/run-unit-test

server/server_test.go

executor/seqtest/seq_executor_test.go

config/config_test.go

morgo · 2022-05-13T20:27:43Z

/run-all-tests

morgo · 2022-05-16T15:57:27Z

~~For this one, we can add upgrade (import values from config) in a followup PR. We have some PRs that have already merged that we need to followup with a bootstrap task to upgrade.~~

Nevermind, upgrade task has been added

session/bootstrap.go

bb7133 · 2022-05-17T10:26:51Z

kv/kv.go

 var (
 	// TxnEntrySizeLimit is limit of single entry size (len(key) + len(value)).
-	TxnEntrySizeLimit uint64 = config.DefTxnEntrySizeLimit
+	TxnEntrySizeLimit = atomic.NewUint64(10485760) //DefTiDBTxnEntrySizeLimit


Why not using DefTiDBTxnEntrySizeLimit directly? BTW 10485760 is not equal to DefTiDBTxnEntrySizeLimit((6 * 1024 * 1024))

Afaik this is due to circular dependencies since sessionctx/variable imports kv. But I agree we can change the starting value to 6M. It will be overwritten in the startup procedure though, as the sysvar cache is populated.

bb7133 · 2022-05-17T10:27:07Z

kv/kv.go

+	TxnEntrySizeLimit = atomic.NewUint64(10485760) //DefTiDBTxnEntrySizeLimit
 	// TxnTotalSizeLimit is limit of the sum of all entry size.
-	TxnTotalSizeLimit uint64 = config.DefTxnTotalSizeLimit
+	TxnTotalSizeLimit = atomic.NewUint64(100 * 1024 * 1024) //DefTiDBTxnTotalSizeLimit


bb7133 · 2022-05-17T10:30:56Z

planner/core/planbuilder.go


 // CMSketchSizeLimit indicates the size limit of CMSketch.
-var CMSketchSizeLimit = kv.TxnEntrySizeLimit / binary.MaxVarintLen32
+var CMSketchSizeLimit = kv.TxnEntrySizeLimit.Load() / binary.MaxVarintLen32


This variable is initialized once and will not be updated with the change of TxnEntrySizeLimit, it could be a risk.

@XuHuaiyu @chrysan Do you have any idea how this should work with the new tidb_entry_size_limit variable?

bb7133 · 2022-05-17T10:37:15Z

/hold

We need to verify the change related to CMSketchSizeLimit.

ti-chi-bot · 2022-05-31T21:31:30Z

@Alkaagr81: PR needs rebase.

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codecov · 2023-07-22T09:50:09Z

Codecov Report

❌ Patch coverage is 26.31579% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.8116%. Comparing base (9f7813c) to head (1eaae25).
⚠️ Report is 10084 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #34448        +/-   ##
================================================
- Coverage   62.8182%   62.8116%   -0.0067%     
================================================
  Files           850        850                
  Lines        276679     276686         +7     
================================================
- Hits         173805     173791        -14     
- Misses        89080      89098        +18     
- Partials      13794      13797         +3

🚀 New features to boost your workflow:

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ti-chi-bot · 2025-09-26T20:30:45Z

@Alkaagr81: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/build	`1eaae25`	link	true	`/test build`
idc-jenkins-ci-tidb/check_dev	`1eaae25`	link	true	`/test check-dev`
idc-jenkins-ci-tidb/mysql-test	`1eaae25`	link	true	`/test mysql-test`
idc-jenkins-ci-tidb/check_dev_2	`1eaae25`	link	true	`/test check-dev2`
pull-mysql-client-test	`1eaae25`	link	true	`/test pull-mysql-client-test`
pull-integration-ddl-test	`1eaae25`	link	true	`/test pull-integration-ddl-test`
idc-jenkins-ci-tidb/unit-test	`1eaae25`	link	true	`/test unit-test`
pull-br-integration-test	`1eaae25`	link	true	`/test pull-br-integration-test`
pull-lightning-integration-test	`1eaae25`	link	true	`/test pull-lightning-integration-test`
pull-integration-e2e-test	`1eaae25`	link	true	`/test pull-integration-e2e-test`
pull-integration-realcluster-test-next-gen	`1eaae25`	link	true	`/test pull-integration-realcluster-test-next-gen`
pull-unit-test-next-gen	`1eaae25`	link	true	`/test pull-unit-test-next-gen`

Full PR test history. Your PR dashboard.

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Alkaagr81 added 5 commits May 5, 2022 11:43

chnages done

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Merge remote-tracking branch 'upstream/master' into tidb_txn_total_si…

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Merge remote-tracking branch 'upstream/master' into tidb_txn_total_si…

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*: move config file option tidb_txn_total_size_limit to sysvar

68b2584

txn entry size limit changes done

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Alkaagr81 requested a review from a team as a code owner May 7, 2022 08:56

ti-chi-bot added release-note Denotes a PR that will be considered when it comes time to generate release notes. size/L Denotes a PR that changes 100-499 lines, ignoring generated files. labels May 7, 2022

Merge remote-tracking branch 'upstream/master' into tidb_txn_total_si…

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Alkaagr81 requested a review from morgo May 10, 2022 18:35

morgo mentioned this pull request May 11, 2022

Convert several config options to Global sysvars #33769

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morgo requested review from cfzjywxk, sticnarf and you06 May 11, 2022 16:21

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Alkaagr81 added 2 commits May 15, 2022 09:45

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Alkaagr81 commented May 7, 2022

What problem does this PR solve?

What is changed and how it works?

Check List

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