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Revert "topsql: enable topsql feature by default (#33195)" #33493

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merged 6 commits into from
Mar 28, 2022
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Revert "topsql: enable topsql feature by default (#33195)" #33493

merged 6 commits into from
Mar 28, 2022

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crazycs520
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This reverts commit 44cf398.

What problem does this PR solve?

Issue Number: close #33492

Problem Summary: Disable TopSQL by default since the performance regression is too large

What is changed and how it works?

Check List

Tests

Release note

None

@crazycs520 crazycs520 requested a review from a team as a code owner March 28, 2022 03:19
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ti-chi-bot commented Mar 28, 2022 •
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[REVIEW NOTIFICATION]

This pull request has been approved by:

  • breeswish
  • zhongzc

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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 Mar 28, 2022
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/run-all-tests

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sre-bot commented Mar 28, 2022 •
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Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/81027f2ac6522592592712c2bb459776dbb48ed2

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ngaut commented Mar 28, 2022

I remember someone is try to do more optimizations to fix this issue. Is it works?

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I remember someone is try to do more optimizations to fix this issue. Is it works?

The current optimization effect is not significant for the time being.

@ti-chi-bot ti-chi-bot added the status/LGT1 Indicates that a PR has LGTM 1. label Mar 28, 2022
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mornyx commented Mar 28, 2022

LGTM

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I remember someone is try to do more optimizations to fix this issue. Is it works?

@ngaut The current performance regression for Sysbench PointSelect is still notable (>5%) so that we have decided to not enable it by default for now.

Luckily,

  • In more complicated cases like TPCC and TPCH the regression is small, so that user is likely to not meet such high regressions in real world.
  • Users can enable or disable the Top SQL feature on-demand in the UI or via SQL.
  • For "Windows Task Manager" in Windows and "Monitor" in MacOS, user only calls it out when needed, i.e. the system is slow. So that we think Top SQL can act similarly: enable on-demand when cluster is in high load.

For reasons above, we will use v6.0.0 with default disabled as the first iteration. It will guide us whether we should do further optimizations in future, or just enable it by default later.

@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 Mar 28, 2022
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Please also roll in @bb7133 to review whether this PR rollback is a safe change.

qw4990
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/merge

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/run-all-tests

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/merge

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

Commit hash: a41a11e

@ti-chi-bot ti-chi-bot added the status/can-merge Indicates a PR has been approved by a committer. label Mar 28, 2022
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/test

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/run-unit-test

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/merge

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/run-unit-test

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/merge

@ti-chi-bot ti-chi-bot merged commit 5c931aa into pingcap:master Mar 28, 2022
ti-srebot pushed a commit to ti-srebot/tidb that referenced this pull request Mar 28, 2022
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cherry pick pingcap#33493 to release-6.0
af63eee 
Signed-off-by: ti-srebot <[email protected]>
@ti-srebot ti-srebot mentioned this pull request Mar 28, 2022
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cherry pick to release-6.0 in PR #33522

ti-chi-bot pushed a commit that referenced this pull request Mar 29, 2022
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Revert "topsql: enable topsql feature by default (#33195)" (#33493) (#…
6f28ac4 
…33522)

close #33492
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@zhongzc zhongzc zhongzc approved these changes

@qw4990 qw4990 qw4990 approved these changes

@breezewish breezewish breezewish approved these changes

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Disable TopSQL by default since the performance regression is too large
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@crazycs520 @ti-chi-bot @sre-bot @ngaut @mornyx @breezewish @ti-srebot @qw4990 @zhongzc