*: add a memdb memory tracker by ekexium · Pull Request #35225 · pingcap/tidb

ekexium · 2022-06-08T07:27:31Z

Signed-off-by: ekexium ekexium@fastmail.com

What problem does this PR solve?

Issue Number: ref #35203

Problem Summary:

What is changed and how it works?

It replaces the EntriesSize in TxnInfo with a memory tracker of MemDB.
We set a hook of the memory change of memdb, thus the manual update of the field is unnecessary.
[TODO] An appropriate limit and an action haven't been set for the tracker. Before we decide how to control it, use total-txn-size-limit for now.

Relates to tikv/client-go#520

Check List

Tests

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

MySQL root@172.16.5.181:CREDIT_CARD> show config where name like '%txn-total%'
+------+-------------------+----------------------------------+------------+
| Type | Instance          | Name                             | Value      |
+------+-------------------+----------------------------------+------------+
| tidb | 172.16.5.181:4000 | performance.txn-total-size-limit | 1099511620 |
+------+-------------------+----------------------------------+------------+
1 row in set
Time: 0.067s
MySQL root@172.16.5.181:CREDIT_CARD> delete from t_1;
You're about to run a destructive command.
Do you want to proceed? (y/n): y
Your call!
(1105, 'Out Of Memory Quota![conn_id=0]')

The statement aborts when the memdb memory footprint reaches the limit (1.02G).

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.

None

ti-chi-bot · 2022-06-08T07:27:33Z

[REVIEW NOTIFICATION]

This pull request has been approved by:

XuHuaiyu
wshwsh12

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ekexium · 2022-06-08T09:27:58Z

/run-build

wshwsh12 · 2022-06-24T06:47:01Z

tests/realtikvtest/txntest/txn_state_test.go

Why not check Size?

Now size is checked by the new test because it now reflects the actual memory footprint and thus is not a fixed number.

tests/realtikvtest/txntest/txn_state_test.go

Signed-off-by: ekexium <ekexium@fastmail.com>

sre-bot · 2022-07-05T22:02:21Z

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1 out of 2 committers have signed the CLA.

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wshwsh12

Rest LGTM

wshwsh12 · 2022-11-21T09:39:10Z

executor/infoschema_reader.go

 					}
 				} else {
-					row = append(row, e.txnInfo[i].ToDatum(c.Name.O))
+					if c.Name.O == txninfo.MemBufferBytesStr {


I think use switch-case-default is better..

XuHuaiyu · 2022-11-22T06:56:02Z

session/session.go

+func (s *session) SetMemoryFootprintChangeHook() {
+	hook := func(mem uint64) {
+		if s.sessionVars.MemDBFootprint == nil {
+			tracker := memory.NewTracker(memory.LabelForMemDB, -1)


Is the total-txn-size-limit actually deprecated after this commit?

It's still used in memdb. But I think we could consider deprecating the config.

Signed-off-by: ekexium <eke@fastmail.com>

ekexium · 2022-11-23T06:59:19Z

There's a test failed for data race. Let's wait for tikv/client-go#621

Signed-off-by: ekexium <eke@fastmail.com>

ekexium · 2022-11-24T04:31:06Z

PTAL @XuHuaiyu

XuHuaiyu · 2022-11-24T06:10:28Z

/merge

ti-chi-bot · 2022-11-24T06:10:31Z

This pull request has been accepted and is ready to merge.

Details

Commit hash: f1b87fc

ti-chi-bot · 2022-11-24T08:50:10Z

@ekexium: Your PR was out of date, I have automatically updated it for you.

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/run-all-tests

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ekexium · 2022-11-24T10:08:08Z

I changed the email address of my git config and caused the CLA check failure. I've made a new PR #39372

ti-chi-bot added do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. release-note-none Denotes a PR that doesn't merit a release note. size/L Denotes a PR that changes 100-499 lines, ignoring generated files. labels Jun 8, 2022

ekexium force-pushed the memdb-tracker branch 2 times, most recently from bd16bfd to 2bda643 Compare June 8, 2022 08:57

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ekexium marked this pull request as ready for review June 8, 2022 09:27

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ekexium mentioned this pull request Jun 8, 2022

Track the memory footprint of MemDB #35203

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XuHuaiyu requested a review from wshwsh12 June 23, 2022 03:12

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ekexium and others added 5 commits June 24, 2022 16:36

add a memdb memory tracker

e40b5c5

Signed-off-by: ekexium <ekexium@fastmail.com>

update deps

07c297a

fix test

0d8de72

Signed-off-by: ekexium <ekexium@fastmail.com>

remove the fake tracking of memdb in insert

078fa86

Signed-off-by: ekexium <ekexium@fastmail.com>

simplify the signature

7348b60

Signed-off-by: ekexium <ekexium@fastmail.com>

ekexium force-pushed the memdb-tracker branch from 15e96d9 to ce95ccb Compare June 24, 2022 08:38

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ekexium force-pushed the memdb-tracker branch from ce95ccb to fdbcc73 Compare June 24, 2022 08:57

fix conflict

befc8ee

Signed-off-by: ekexium <ekexium@fastmail.com>

ekexium force-pushed the memdb-tracker branch from fdbcc73 to befc8ee Compare June 24, 2022 09:53

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Merge branch 'master' of github.com:pingcap/tidb into memdb-tracker

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ekexium force-pushed the memdb-tracker branch 2 times, most recently from 0b661bd to 30a86ff Compare November 16, 2022 09:38

wshwsh12 approved these changes Nov 21, 2022

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Merge branch 'master' into memdb-tracker

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ekexium added 2 commits November 22, 2022 16:55

refactor: use switch-default

b8b5b89

Signed-off-by: ekexium <eke@fastmail.com>

fix: only reset session tracker when detach SQLText tracker

b01184c

Signed-off-by: ekexium <eke@fastmail.com>

ekexium force-pushed the memdb-tracker branch from 0e38f62 to bde3c82 Compare November 23, 2022 02:40

test: fix TestTiDBTrx

cb76015

Signed-off-by: ekexium <eke@fastmail.com>

ekexium force-pushed the memdb-tracker branch from bde3c82 to cb76015 Compare November 23, 2022 03:01

Merge branch 'master' into memdb-tracker

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ekexium force-pushed the memdb-tracker branch 2 times, most recently from c2e303b to 33122d4 Compare November 23, 2022 12:03

update client-go

f1b87fc

Signed-off-by: ekexium <eke@fastmail.com>

ekexium force-pushed the memdb-tracker branch from 33122d4 to f1b87fc Compare November 24, 2022 03:19

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ti-chi-bot added 4 commits November 24, 2022 14:10

Merge branch 'master' into memdb-tracker

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Merge branch 'master' into memdb-tracker

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Merge branch 'master' into memdb-tracker

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Merge branch 'master' into memdb-tracker

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ekexium mentioned this pull request Nov 24, 2022

*: add a memdb memory tracker #39372

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ekexium closed this Nov 24, 2022

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