puller/sorter: remove manual GC settings

[overvenus]

What problem does this PR solve?

Do not change default GC settings, it could reduce the minimum mutator utilization and lead to #2202.

Close #2202

Check List

Tests

• Manual test (add detailed scripts or steps below)

Capturing 6k tables.

Related changes

• Need to cherry-pick to the release branch

Release note

Fix gRPC keepalive error when memory pressure is high.

[amyangfei]

The trace result from #2202 shows the GC pause time reduces from 25s to 7s after turning off gc percent adjust. However 7s is still quite a long GC pause time. Is there any more PRs to address this problem.

[overvenus]

The trace result from #2202 shows the GC pause time reduces from 25s to 7s after turning off gc percent adjust. However 7s is still quite a long GC pause time. Is there any more PRs to address this problem.

7s pause is likely caused by memory leak with new ower enabled, here is the issue https://github.com/pingcap/ticdc/issues/2212

[ti-chi-bot]

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[amyangfei]

/hold

[amyangfei]

This pr will be evaluated by more tests

[overvenus]

I am going to merge this PR. Tests (https://github.com/pingcap/ticdc/pull/2699#issue-724007913) show without changing default GC setting, TiCDC can handle 140G incremental data (no OOM).

[overvenus]

/merge

[ti-chi-bot]

@overvenus: /merge in this pull request requires 2 approval(s).

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/merge

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[overvenus]

/merge

[ti-chi-bot]

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

Commit hash: 610833b

[overvenus]

/run-kafka-tests
/run-integration-tests

[codecov-commenter]

Codecov Report

Merging #2214 (6c46ceb) into master (81c22b1) will increase coverage by 5.2245%.
The diff coverage is 68.8027%.

@@               Coverage Diff                @@
##             master      #2214        +/-   ##
================================================
+ Coverage   55.8716%   61.0962%   +5.2245%     
================================================
  Files           169        161         -8     
  Lines         20667      17916      -2751     
================================================
- Hits          11547      10946       -601     
+ Misses         8012       5975      -2037     
+ Partials       1108        995       -113     

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #2718.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #2719.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #2720.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #2721.