Revert "tikv_util: introduce future channel (#13407)"

[tabokie]

This reverts commit 7382d4e.

Signed-off-by: tabokie xy.tao@outlook.com

What is changed and how it works?

Issue Number: Ref #13394

What's Changed:

#13407 causes 3%~7% regression to multiple workloads, including update_non_index, oltp_read_write, bank, [...].

Test runs:

• Bank: { 6.3 } = [-10%] { 6.2 }; { 6.3 + patch } = [-3.0%] { 6.2 }
• update_non_index: { 6.2 + 6.3 tikv } = [-4%] { 6.2 }; { 6.2 + patch } = [+1%] { 6.2 }
• update_non_index: { 6.3 } = [-7.5%] { 6.2 }; { 6.3 + patch } = [-2%] { 6.2 }
• oltp_read_write: { 6.3 } = [-0.5%] { 6.2 }; { 6.3 + patch } = [+2%] { 6.2 }
• TPC-C: { 6.3 } = [-6%] { 6.2 }; { 6.3 + patch } = [-4%] { 6.2 }

Related changes

Check List

Tests

• Unit test

Release note

None

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• BusyJay
• sticnarf

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[tabokie]

/run-build

[BusyJay]

Interesting. I also did a benchmark and the difference was within 3%. #13407 (comment).

[BusyJay]

LGTM as we 6.3 doesn't depend on the patch.

[sticnarf]

/merge

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

Commit hash: 5e46160