cdc: unit test clientSuite.TestStreamSendWithError is unstable

[pingyu]

Bug Report

1. Describe the bug

CDC unit test clientSuite.TestStreamSendWithError is unstable.

[2022-11-05T10:25:30.858Z] ----------------------------------------------------------------------
[2022-11-05T10:25:30.858Z] FAIL: client_test.go:1252: clientSuite.TestStreamSendWithError
[2022-11-05T10:25:30.858Z] 
[2022-11-05T10:25:30.858Z] client_test.go:1341:
[2022-11-05T10:25:30.858Z]     c.Assert(err, check.IsNil)
[2022-11-05T10:25:30.858Z] ... value *errors.Error = &errors.Error{code:0, codeText:"CDC:ErrReachMaxTry", message:"reach maximum try: %d", redactArgsPos:[]int(nil), cause:(*errors.fundamental)(0xc001a78738), args:[]interface {}{10}, file:"/home/jenkins/agent/workspace/ut-check/migration/cdc/pkg/retry/retry_with_opt.go", line:65} ("[CDC:ErrReachMaxTry]reach maximum try: 10: waiting for kv client requests received by server")

CI link: https://ci.pingcap.net/blue/organizations/jenkins/ut-check/detail/ut-check/42327/pipeline/

2. Minimal reproduce step (Required)

Run CI.

3. What did you see instead (Required)

CI pass.

4. What did you expect to see? (Required)

CI failed.

5. What is your migration tool and TiKV version? (Required)

• TiKV: master ([to #295] Speed up cdc integrated tests #294)
• TiKV CDC:
• TiKV BR:
• TiKV Online Bulk Load:

[github-actions]

This issue is stale because it has been open 30 days with no activity.