schedulers: reduce the batch size to avoid discarding

[ethercflow]

ref #5638

Signed-off-by: Wenbo Zhang ethercflow@gmail.com

What problem does this PR solve?

Issue Number: Close #5638

What is changed and how does it work?

- Reduce the batch size to avoid discarding if it exceeds MaxWaitingOperator
- Increase the channel capacity to avoid discarding when the capacity is full

Check List

Tests

• No code

Code changes

• None

Side effects

• None

Related changes

• None

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• JmPotato
• rleungx

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[codecov]

Codecov Report

Base: 75.51% // Head: 75.47% // Decreases project coverage by -0.04% ⚠️

Coverage data is based on head (e400501) compared to base (2a7c8d4).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5918      +/-   ##
==========================================
- Coverage   75.51%   75.47%   -0.04%     
==========================================
  Files         345      345              
  Lines       35126    35126              
==========================================
- Hits        26525    26511      -14     
- Misses       6309     6320      +11     
- Partials     2292     2295       +3     

Flag	Coverage Δ
unittests	75.47% <ø> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
server/schedulers/transfer_witness_leader.go	81.39% <ø> (ø)
pkg/errs/errs.go	75.00% <0.00%> (-25.00%)	⬇️
...erver/config/service_middleware_persist_options.go	91.66% <0.00%> (-8.34%)	⬇️
pkg/utils/etcdutil/etcdutil.go	84.88% <0.00%> (-3.49%)	⬇️
pkg/encryption/key_manager.go	70.11% <0.00%> (-1.60%)	⬇️
server/server.go	74.52% <0.00%> (-1.27%)	⬇️
pkg/tso/allocator_manager.go	63.54% <0.00%> (-1.13%)	⬇️
server/storage/hot_region_storage.go	78.14% <0.00%> (-1.10%)	⬇️
pkg/btree/btree_generic.go	86.34% <0.00%> (-0.93%)	⬇️
server/schedule/operator_controller.go	85.97% <0.00%> (-0.91%)	⬇️
... and 12 more

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[JmPotato]

/merge

[ti-chi-bot]

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[ti-chi-bot]

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

Commit hash: e400501