Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

executor: add the missed runtime stats when the index merge partial task returns 0 row #35297

Merged
merged 9 commits into from
Jun 20, 2022
Merged

executor: add the missed runtime stats when the index merge partial task returns 0 row #35297

merged 9 commits into from
Jun 20, 2022

Conversation

time-and-fate
Copy link
Member

What problem does this PR solve?

Issue Number: close #35296

Problem Summary:

If the there is no more handle, the time for this cop task execution is not recorded.

What is changed and how it works?

Record the missed information.

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

@ti-chi-bot
Copy link
Member

ti-chi-bot commented Jun 10, 2022 •
edited
Loading

[REVIEW NOTIFICATION]

This pull request has been approved by:

  • guo-shaoge
  • wshwsh12

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.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by submitting an approval review.
Reviewer can cancel approval by submitting a request changes review.

@ti-chi-bot ti-chi-bot added release-note-none Denotes a PR that doesn't merit a release note. do-not-merge/needs-triage-completed size/S Denotes a PR that changes 10-29 lines, ignoring generated files. labels Jun 10, 2022
@sre-bot
Copy link
Contributor

sre-bot commented Jun 10, 2022 •
edited
Loading

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/ed39731f531c799b6baad9984d5e72e69a546a3c

@ti-chi-bot ti-chi-bot added the status/LGT1 Indicates that a PR has LGTM 1. label Jun 13, 2022
XuHuaiyu
XuHuaiyu reviewed Jun 13, 2022
View reviewed changes
executor/index_merge_reader.go
@@ -820,6 +820,9 @@ func (w *partialIndexWorker) fetchHandles(
return count, err
}
if len(handles) == 0 {
if basicStats != nil {
basicStats.Record(time.Since(start), chk.NumRows())
Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

What does the chk.NumRows() mean for partialIndexWorker?

Copy link
Member Author

@time-and-fate time-and-fate Jun 13, 2022 •
edited
Loading

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

This line of code is the same as this line in the same function:

tidb/executor/index_merge_reader.go

Line 840 in b91bdd0

basicStats.Record(time.Since(start), chk.NumRows())

I just copied it here.

Copy link
Member Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Theoretically, it should be the actual row count of this operator but in fact, it's useless.
Because the root operator of a partial worker has both root stats and cop stats, and according to getRuntimeInfo(), in this case, the actual row count in the cop stats will be used:

tidb/planner/core/common_plans.go

Lines 1514 to 1528 in b91bdd0

if runtimeStatsColl.ExistsRootStats(explainID) {
rootStats := runtimeStatsColl.GetRootStats(explainID)
analyzeInfo = rootStats.String()
actRows = strconv.FormatInt(rootStats.GetActRows(), 10)
} else {
actRows = "0"
}
if runtimeStatsColl.ExistsCopStats(explainID) {
if len(analyzeInfo) > 0 {
analyzeInfo += ", "
}
copStats := runtimeStatsColl.GetCopStats(explainID)
analyzeInfo += copStats.String()
actRows = strconv.FormatInt(copStats.GetActRows(), 10)
}

wshwsh12
wshwsh12 approved these changes Jun 20, 2022
View reviewed changes
Copy link
Contributor

@wshwsh12 wshwsh12 left a comment

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

LGTM

@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 20, 2022
@time-and-fate
Copy link
Member Author

/merge

@ti-chi-bot
Copy link
Member

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

Commit hash: 97f3394

@ti-chi-bot ti-chi-bot added the status/can-merge Indicates a PR has been approved by a committer. label Jun 20, 2022
@time-and-fate
Copy link
Member Author

/run-unit-test

@hawkingrei
Copy link
Member

/run-mysql-test

@ti-chi-bot ti-chi-bot merged commit fcfa26c into pingcap:master Jun 20, 2022
@sre-bot
Copy link
Contributor

sre-bot commented Jun 20, 2022

TiDB MergeCI notify

✅ Well Done! New fixed [1] after this pr merged.

CI Name Result Duration Compare with Parent commit
idc-jenkins-ci-tidb/integration-common-test ✅ all 11 tests passed 20 min Fixed
idc-jenkins-ci/integration-cdc-test 🟢 all 34 tests passed 25 min Existing passed
idc-jenkins-ci-tidb/common-test 🟢 all 12 tests passed 10 min Existing passed
idc-jenkins-ci-tidb/tics-test 🟢 all 1 tests passed 8 min 50 sec Existing passed
idc-jenkins-ci-tidb/sqllogic-test-2 🟢 all 28 tests passed 8 min 22 sec Existing passed
idc-jenkins-ci-tidb/sqllogic-test-1 🟢 all 26 tests passed 7 min 52 sec Existing passed
idc-jenkins-ci-tidb/integration-ddl-test 🟢 all 6 tests passed 7 min 3 sec Existing passed
idc-jenkins-ci-tidb/integration-compatibility-test 🟢 all 1 tests passed 3 min 35 sec Existing passed
idc-jenkins-ci-tidb/mybatis-test 🟢 all 1 tests passed 3 min 20 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 28, 2022
@morgo
Merge remote-tracking branch 'upstream/master' into kill-ddl
afde8a8 
* upstream/master:
  sessionctx: support encoding and decoding session variables (pingcap#35531)
  planner: add batch_point_get access object (pingcap#35230)
  sessionctx: set skipInit false for TiDBOptProjectionPushDown and TiDBOptAggPushDown (pingcap#35491)
  *: add support for disabling noop variables (pingcap#35496)
  lightning: add store write limiter (pingcap#35193)
  expression: avoid padding 0 when implicitly cast to binary (pingcap#35053)
  types: fix creating partition tables fail in ANSI_QUOTES mode (pingcap#35379)
  executor: add the missed runtime stats when the index merge partial task returns 0 row (pingcap#35297)
  statistics: batch insert topn and bucket when saving table stats (pingcap#35326)
  parser: Add support for INTERVAL expr unit + expr (pingcap#30253) (pingcap#35390)
  config: add missing nodelay example (pingcap#35255)
  *: Introduce `OptimisticTxnContextProvider` for optimistic txn (pingcap#35131)
  statistics: fix panic when using wrong globalStats.Indices key (pingcap#35424)
  *: fix store token is up to the limit in test (pingcap#35374)
  *: enable more flaky and update bazel config (pingcap#35500)
  ddl: expose getPrimaryKey() as a public method of model.TableInfo (pingcap#35512)
  expression, util: add `KeyWithoutTrimRightSpace` for collator (pingcap#35475)
  infoschema: try on each PD member until one succeeds or all fail (pingcap#35285)
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Reviewers

@wshwsh12 wshwsh12 wshwsh12 approved these changes

@guo-shaoge guo-shaoge guo-shaoge approved these changes

@XuHuaiyu XuHuaiyu Awaiting requested review from XuHuaiyu

Assignees
No one assigned
Labels
release-note-none Denotes a PR that doesn't merit a release note. size/S Denotes a PR that changes 10-29 lines, ignoring generated files. status/can-merge Indicates a PR has been approved by a committer. status/LGT2 Indicates that a PR has LGTM 2.
Projects
None yet
Milestone
No milestone
Development

Successfully merging this pull request may close these issues.

runtime stats get lost if the index merge partial task return 0 row
7 participants
@time-and-fate @ti-chi-bot @sre-bot @hawkingrei @guo-shaoge @XuHuaiyu @wshwsh12