executor: Enlarge the timeout for fetching TiFlash system tables (#57967)

[ti-chi-bot]

This is an automated cherry-pick of #57967

What problem does this PR solve?

Issue Number: close #57816

Problem Summary:

The timeout is only 1 second for fetching the system table from tiflash instance. When there are thousand of table with tiflash replica under the disaggregated compute and storage arch, fetching the metadata require accessing files stored on S3. Under that situation, the 1 second is too short for timeout.

tidb/pkg/executor/infoschema_reader.go

Lines 3484 to 3489 in 9812d85

	// send request to tiflash, timeout is 1s
	instanceID := e.instanceIDs[e.instanceIdx]
	resp, err := tikvStore.GetTiKVClient().SendRequest(ctx, instanceID, &request, time.Second)
	if err != nil {
	return nil, errors.Trace(err)
	}

What changed and how does it work?

Fetching the info with about 5000 tables and 10 TiB data under disaggregated arch take about 3 seconds. Enlarge the timeout for fetching data from each tiflash instance to be 5 minutes is long enough.

And I've tested that the query respect max_execution_time.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  Inject an failpoint in TiFlash to stop responsing the system table query and make the tidb query on TIFLASH_TABLES timeout
• No need to test

  • I checked and no code files have been changed.

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

Please refer to Release Notes Language Style Guide to write a quality release note.

Fix an issue that in the disaggregated storage and compute architecture, executing queries on tiflash related system tables might timeout

[JaySon-Huang]

@guo-shaoge @lidezhu PTAL

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.1     #57978   +/-   ##
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Flag	Coverage Δ
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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: guo-shaoge, lidezhu

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-05 02:18:06.515968782 +0000 UTC m=+1294074.135623291: ☑️ agreed by lidezhu.
• 2024-12-05 02:18:23.855166817 +0000 UTC m=+1294091.474821330: ☑️ agreed by guo-shaoge.