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optimize memory usage of lock cf #4857

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optimize memory usage of lock cf #4857

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lidezhu
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@lidezhu lidezhu commented May 10, 2022 •
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What problem does this PR solve?

Issue Number: ref #4728

Problem Summary: For lock cf, we store both it's TiKVValue for serialization and DecodedLockCFValue for lock resolve which is redundant and consume a lot of memory.

What is changed and how it works?

Avoid store TiKVValue for lock cf and generating it on the fly.

Check List

Tests

  • Unit test
  • Integration test
  • Manual test (add detailed scripts or steps below)
  1. load tpch50;
  2. run 2. update lineitem set L_SUPPKEY=100000 limit 50000000;

Before optimize:
image
After optimize:
image
The memory consumption peak decreases about 10GB.

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

None

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ti-chi-bot commented May 10, 2022 •
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[REVIEW NOTIFICATION]

This pull request has been approved by:

  • flowbehappy

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 do-not-merge/needs-linked-issue 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 May 10, 2022
@lidezhu lidezhu changed the title Avoid save TiKVValue for lock cf [DNM] Avoid save TiKVValue for lock cf May 10, 2022
@lidezhu lidezhu changed the title [DNM] Avoid save TiKVValue for lock cf [DNM] avoid save TiKVValue for lock cf May 10, 2022
@ti-chi-bot ti-chi-bot added size/XL Denotes a PR that changes 500-999 lines, ignoring generated files. and removed size/L Denotes a PR that changes 100-499 lines, ignoring generated files. labels May 10, 2022
@ti-chi-bot ti-chi-bot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Jun 19, 2022
@ti-chi-bot ti-chi-bot added size/L Denotes a PR that changes 100-499 lines, ignoring generated files. and removed needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. size/XL Denotes a PR that changes 500-999 lines, ignoring generated files. labels Jun 27, 2022
@lidezhu lidezhu force-pushed the optimize-lock-cf branch from 032738e to 50ed174 Compare June 27, 2022 13:51
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lidezhu commented Jun 27, 2022

/run-all-tests

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lidezhu commented Jun 27, 2022

/run-unit-test

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lidezhu commented Jun 27, 2022

/run-unit-test

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lidezhu commented Jun 28, 2022

/run-unit-test

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lidezhu commented Jun 28, 2022

/run-unit-test

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lidezhu commented Jun 28, 2022

/run-unit-test

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lidezhu commented Jun 28, 2022

/run-unit-test

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lidezhu commented Jun 28, 2022

/run-unit-test

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lidezhu commented Jun 28, 2022

/run-unit-test

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sre-bot commented Jun 28, 2022

Coverage for changed files

Filename                          Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
RegionCFDataBase.cpp                  186                23    87.63%          27                 1    96.30%         299                28    90.64%         108                28    74.07%
RegionCFDataBase.h                      1                 0   100.00%           1                 0   100.00%           1                 0   100.00%           0                 0         -
RegionCFDataTrait.h                    12                 2    83.33%           9                 2    77.78%          32                 6    81.25%           2                 0   100.00%
RegionData.cpp                         65                 8    87.69%          20                 2    90.00%         171                18    89.47%          50                16    68.00%
SerializationHelper.h                  32                 5    84.38%           4                 0   100.00%          34                 3    91.18%           8                 4    50.00%
TiKVRecordFormat.h                    105                10    90.48%          37                 1    97.30%         278                18    93.53%          50                 5    90.00%
tests/gtest_tikv_keyvalue.cpp        3015               729    75.82%           9                 4    55.56%         470                44    90.64%         984               519    47.26%
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                                3416               777    77.25%         107                10    90.65%        1285               117    90.89%        1202               572    52.41%

Coverage summary

Functions  MissedFunctions  Executed  Lines   MissedLines  Cover
18388      9658             47.48%    206794  96754        53.21%

full coverage report (for internal network access only)

@lidezhu lidezhu force-pushed the optimize-lock-cf branch from b556676 to b273666 Compare June 28, 2022 10:02
@lidezhu lidezhu force-pushed the optimize-lock-cf branch from b273666 to 504b39a Compare June 28, 2022 10:07
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lidezhu commented Jun 28, 2022

/run-all-tests

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sre-bot commented Jun 28, 2022

Coverage for changed files

Filename                          Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
RegionCFDataBase.cpp                  114                15    86.84%          27                 1    96.30%         292                28    90.41%          84                16    80.95%
RegionCFDataBase.h                      1                 0   100.00%           1                 0   100.00%           1                 0   100.00%           0                 0         -
RegionCFDataTrait.h                    12                 2    83.33%           9                 2    77.78%          32                 6    81.25%           2                 0   100.00%
RegionData.cpp                         65                 8    87.69%          20                 2    90.00%         171                18    89.47%          50                16    68.00%
TiKVRecordFormat.h                    105                10    90.48%          37                 1    97.30%         278                18    93.53%          50                 5    90.00%
tests/gtest_tikv_keyvalue.cpp        3015               729    75.82%           9                 4    55.56%         470                44    90.64%         984               519    47.26%
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                                3312               764    76.93%         103                10    90.29%        1244               114    90.84%        1170               556    52.48%

Coverage summary

Functions  MissedFunctions  Executed  Lines   MissedLines  Cover
18388      9659             47.47%    206785  96749        53.21%

full coverage report (for internal network access only)

@lidezhu lidezhu changed the title [DNM] avoid save TiKVValue for lock cf optimize the memory usage of lock cf Jun 28, 2022
@lidezhu lidezhu changed the title optimize the memory usage of lock cf optimize memory usage of lock cf Jun 28, 2022
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lidezhu commented Jun 29, 2022

/run-all-tests

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sre-bot commented Jun 29, 2022

Coverage for changed files

Filename                          Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
RegionCFDataBase.cpp                  114                15    86.84%          27                 1    96.30%         292                28    90.41%          84                16    80.95%
RegionCFDataBase.h                      1                 0   100.00%           1                 0   100.00%           1                 0   100.00%           0                 0         -
RegionCFDataTrait.h                    12                 2    83.33%           9                 2    77.78%          32                 6    81.25%           2                 0   100.00%
RegionData.cpp                         65                 8    87.69%          20                 2    90.00%         171                18    89.47%          50                16    68.00%
TiKVRecordFormat.h                    105                10    90.48%          37                 1    97.30%         278                18    93.53%          50                 5    90.00%
tests/gtest_tikv_keyvalue.cpp        3015               729    75.82%           9                 4    55.56%         470                44    90.64%         984               519    47.26%
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                                3312               764    76.93%         103                10    90.29%        1244               114    90.84%        1170               556    52.48%

Coverage summary

Functions  MissedFunctions  Executed  Lines   MissedLines  Cover
18402      9635             47.64%    207064  96430        53.43%

full coverage report (for internal network access only)

@lidezhu lidezhu requested a review from flowbehappy June 29, 2022 08:33
@lidezhu lidezhu requested a review from CalvinNeo June 29, 2022 08:34
@lidezhu lidezhu requested a review from JaySon-Huang June 29, 2022 08:34
@ti-chi-bot ti-chi-bot added the status/LGT1 Indicates that a PR has LGTM 1. label Jul 9, 2022
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/hold

@ti-chi-bot ti-chi-bot added the do-not-merge/hold Indicates that a PR should not merge because someone has issued a /hold command. label Jul 11, 2022
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lidezhu commented Jul 11, 2022

The short value in lock cf may be used when adapting to cloud engine. So this optimization may be not applicable.

@flowbehappy flowbehappy mentioned this pull request Jul 25, 2022
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@ti-chi-bot ti-chi-bot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Nov 6, 2022
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@lidezhu: PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

@lidezhu lidezhu closed this Mar 31, 2023
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@flowbehappy flowbehappy flowbehappy approved these changes

@CalvinNeo CalvinNeo Awaiting requested review from CalvinNeo

@JaySon-Huang JaySon-Huang Awaiting requested review from JaySon-Huang

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