Add a metric to statistics expansion or reused.

[jiaqizho]

What problem does this PR solve?

Issue Number: ref #3594

Problem Summary:

What is changed and how it works?

• Add a return value from spacemap after request search which can help to count whether the address is reused.
• also added two metrics in tiflash.

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

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• flowbehappy
• hehechen

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[flowbehappy]

@jiaqizho Please explain about "What is changed and how it works?" of this PR. You can also post a screenshot of the newly added metric panel.

[jiaqizho]

@jiaqizho Please explain about "What is changed and how it works?" of this PR. You can also post a screenshot of the newly added metric panel.

that is the problem, actually, this pr has not been tested in tiup yet. only tested in ut.

[JaySon-Huang]

Code parts LGTM.
But seems we need to create a new panel rather than mixed them in "Disk Write OPS" panel

[jiaqizho]

@JaySon-Huang new pannel looks like.

[jiaqizho]

@JaySon-Huang new pannel looks like.

also changed width 24 to 12.

a

[JaySon-Huang]

some comments about description

[JaySon-Huang]

LGTM

[jiaqizho]

/merge

[ti-chi-bot]

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/run-all-tests

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[ti-chi-bot]

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

Commit hash: 7a88dc7

[sre-bot]

Coverage for changed files

Filename                                         Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Common/ProfileEvents.cpp                             140                 0   100.00%           2                 0   100.00%          11                 0   100.00%           0                 0         -
Storages/Page/V3/BlobStore.cpp                       483               159    67.08%          49                 3    93.88%         995               241    75.78%         302               119    60.60%
Storages/Page/V3/spacemap/SpaceMap.h                   7                 2    71.43%           4                 1    75.00%          18                 5    72.22%           6                 1    83.33%
Storages/Page/V3/spacemap/SpaceMapRBTree.cpp         343                95    72.30%          18                 1    94.44%         568               117    79.40%         200                64    68.00%
Storages/Page/V3/spacemap/SpaceMapRBTree.h             2                 0   100.00%           2                 0   100.00%           5                 0   100.00%           0                 0         -
Storages/Page/V3/spacemap/SpaceMapSTDMap.h           155                19    87.74%          11                 0   100.00%         255                20    92.16%          98                20    79.59%
Storages/Page/V3/tests/gtest_free_map.cpp           2176               357    83.59%          13                 0   100.00%         270                 0   100.00%         712               356    50.00%
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                                               3306               632    80.88%          99                 5    94.95%        2122               383    81.95%        1318               560    57.51%

Coverage summary

Functions  MissedFunctions  Executed  Lines   MissedLines  Cover
18077      10153            43.83%    200553  101020       49.63%

full coverage report (for internal network access only)

[sre-bot]

Coverage for changed files

Filename                                         Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Common/ProfileEvents.cpp                             140                 0   100.00%           2                 0   100.00%          11                 0   100.00%           0                 0         -
Storages/Page/V3/BlobStore.cpp                       489               161    67.08%          49                 3    93.88%        1006               245    75.65%         308               122    60.39%
Storages/Page/V3/spacemap/SpaceMap.h                   7                 2    71.43%           4                 1    75.00%          18                 5    72.22%           6                 1    83.33%
Storages/Page/V3/spacemap/SpaceMapRBTree.cpp         343                95    72.30%          18                 1    94.44%         568               117    79.40%         200                64    68.00%
Storages/Page/V3/spacemap/SpaceMapRBTree.h             2                 0   100.00%           2                 0   100.00%           5                 0   100.00%           0                 0         -
Storages/Page/V3/spacemap/SpaceMapSTDMap.h           155                19    87.74%          11                 0   100.00%         255                20    92.16%          98                20    79.59%
Storages/Page/V3/tests/gtest_free_map.cpp           2176               357    83.59%          13                 0   100.00%         270                 0   100.00%         712               356    50.00%
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                                               3312               634    80.86%          99                 5    94.95%        2133               387    81.86%        1324               563    57.48%

Coverage summary

Functions  MissedFunctions  Executed  Lines   MissedLines  Cover
18091      10149            43.90%    200992  100983       49.76%

full coverage report (for internal network access only)