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planner: introduce new cost formula for MPPAggs #35436

Merged
merged 7 commits into from
Jun 21, 2022
Merged

planner: introduce new cost formula for MPPAggs #35436

merged 7 commits into from
Jun 21, 2022

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qw4990
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@qw4990 qw4990 commented Jun 16, 2022 •
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What problem does this PR solve?

Issue Number: ref #35240

Problem Summary: introduce new cost formula for MPPAggs

What is changed and how it works?

On modelVer2: Hash/StreamAgg: use the dedicated TiFlash CPU Factor when calculating CPU costs;

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

  • Affects user behaviors
  • Contains syntax changes
  • Contains variable changes
  • Contains experimental features
  • Changes MySQL compatibility

Release note

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

None

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ti-chi-bot commented Jun 16, 2022 •
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[REVIEW NOTIFICATION]

This pull request has been approved by:

  • Reminiscent
  • time-and-fate

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

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@ti-chi-bot ti-chi-bot added release-note-none Denotes a PR that doesn't merit a release note. size/M Denotes a PR that changes 30-99 lines, ignoring generated files. labels Jun 16, 2022
@qw4990 qw4990 added type/enhancement The issue or PR belongs to an enhancement. sig/planner SIG: Planner labels Jun 16, 2022
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sre-bot commented Jun 16, 2022 •
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Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/7988c1245e8b2b9da82e05712302febbe2cedc68

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qw4990 commented Jun 16, 2022

wait for #35438

qw4990
qw4990 commented Jun 17, 2022
View reviewed changes
planner/core/plan_cost.go
@@ -1144,6 +1164,9 @@ func (p *PhysicalExchangeReceiver) GetPlanCost(taskType property.TaskType, costF
}

func getOperatorActRows(operator PhysicalPlan) float64 {
if operator == nil {
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It can be nil in some update-statements.

@qw4990 qw4990 changed the title planner: introduce new cost formula for MPPAggs/MPPExchanger planner: introduce new cost formula for MPPAggs Jun 17, 2022
@ti-chi-bot ti-chi-bot added the status/LGT1 Indicates that a PR has LGTM 1. label Jun 20, 2022
Reminiscent
Reminiscent reviewed Jun 21, 2022
View reviewed changes
planner/core/plan_cost.go
@@ -326,7 +331,8 @@ func (p *PhysicalTableReader) GetPlanCost(taskType property.TaskType, costFlag u
// consider concurrency
p.planCost /= concurrency
// consider tidb_enforce_mpp
if isMPP && p.ctx.GetSessionVars().IsMPPEnforced() {
if isMPP && p.ctx.GetSessionVars().IsMPPEnforced() &&
!hasCostFlag(costFlag, CostFlagRecalculate) { // show the real cost in explain-statements
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Will this make a different plan when we use explain or not?

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Yes, but I think it's expected. Currently, if we enable enforce_mpp, all plan costs will be zero, which is weird.

@ti-chi-bot ti-chi-bot added status/LGT2 Indicates that a PR has LGTM 2. and removed status/LGT1 Indicates that a PR has LGTM 1. labels Jun 21, 2022
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/merge

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

Commit hash: 7988c12

@ti-chi-bot ti-chi-bot added the status/can-merge Indicates a PR has been approved by a committer. label Jun 21, 2022
@ti-chi-bot ti-chi-bot merged commit 97ac647 into pingcap:master Jun 21, 2022
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sre-bot commented Jun 21, 2022

TiDB MergeCI notify

CI Name Result Duration Compare with Parent commit
idc-jenkins-ci/integration-cdc-test 🟢 all 35 tests passed 25 min Existing passed
idc-jenkins-ci-tidb/integration-common-test 🟢 all 11 tests passed 18 min Existing passed
idc-jenkins-ci-tidb/common-test 🟢 all 12 tests passed 11 min Existing passed
idc-jenkins-ci-tidb/integration-ddl-test 🟢 all 6 tests passed 6 min 37 sec Existing passed
idc-jenkins-ci-tidb/sqllogic-test-2 🟢 all 28 tests passed 5 min 19 sec Existing passed
idc-jenkins-ci-tidb/tics-test 🟢 all 1 tests passed 4 min 58 sec Existing passed
idc-jenkins-ci-tidb/sqllogic-test-1 🟢 all 26 tests passed 4 min 45 sec Existing passed
idc-jenkins-ci-tidb/integration-compatibility-test 🟢 all 1 tests passed 3 min 9 sec Existing passed
idc-jenkins-ci-tidb/mybatis-test 🟢 all 1 tests passed 2 min 57 sec Existing passed
idc-jenkins-ci-tidb/plugin-test 🟢 build success, plugin test success 4min Existing passed

morgo added a commit to morgo/tidb that referenced this pull request Jun 21, 2022
@morgo
Merge remote-tracking branch 'upstream/master' into add-bootstrap-sql
d5c463f 
* upstream/master:
  planner: make some `show stmt` more fine-grained privilege check (pingcap#35493)
  session: improve bootstrap code (pingcap#34755)
  *: upgrade go-proxyprotocol version (pingcap#35560)
  planner: introduce new cost formula for MPPAggs (pingcap#35436)
qw4990 added a commit to qw4990/tidb that referenced this pull request Jul 12, 2022
@qw4990
planner: introduce new cost formula for MPPAggs (pingcap#35436)
1a876c9 
ref pingcap#35240
@qw4990 qw4990 mentioned this pull request Jul 12, 2022
Merged
qw4990 added a commit that referenced this pull request Jul 12, 2022
@qw4990
planner: introduce new cost formula for MPPAggs (#35436) (#36133)
a65753d
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@time-and-fate time-and-fate time-and-fate approved these changes

@Reminiscent Reminiscent Reminiscent approved these changes

@xuyifangreeneyes xuyifangreeneyes Awaiting requested review from xuyifangreeneyes

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