*: don't use chunk rpc protocol for internal session (#31723)

[ti-srebot]

cherry-pick #31723 to release-5.3
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/32344

After apply modifications, you can push your change to this PR via:

git push [email protected]:ti-srebot/tidb.git pr/32344:release-5.3-acc3ae622926

---

What problem does this PR solve?

Issue Number: close #30880

This is a workaround rather than a direct fix.

Problem Summary:

Chunk RPC protocol have the memory leak problem #30880

Before we figure out how it's happening and fix the bug, we can avoid using it for internal sessions.

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

After avoiding using chunk RPC protocol for internal session, the memory usage is low.

./bin/dumpling  -h "172.16.5.59" -P "4897" -u "root" --output "s3://tmp/dumpling-outputc1144ef2-c669-4aea-8482-87b3ab6efbc2?access-key=XXXXXXX&secret-access-key=XXXXXXXX&endpoint= XXXXXXXX&force-path-style=true" --filetype "csv" --filesize "256M" --rows "200" --threads 4 --params "tidb_enable_chunk_rpc=0"

• 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:

• hawkingrei
• wshwsh12

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[ti-srebot]

/run-all-tests

[ti-srebot]

@tiancaiamao you're already a collaborator in bot's repo.

[tiancaiamao]

/merge

[ti-chi-bot]

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

Commit hash: 2e87255

[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/e9b8ecb3ff3c04f992f0a494e591b80c42ec83ae