Flaky-test: PersistentSubscriptionMessageDispatchStreamingDispatcherThrottlingTest.testMultiLevelDispatch

[HQebupt]

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PersistentSubscriptionMessageDispatchStreamingDispatcherThrottlingTest.testMultiLevelDispatch is flaky. It fails sporadically.

Example failure

Example failure

Exception stacktrace

Error:  Failures: 
[2359](https://github.com/apache/pulsar/runs/8115929202?check_suite_focus=true#step:10:2361)
  Error:  org.apache.pulsar.broker.service.persistent.PersistentSubscriptionMessageDispatchStreamingDispatcherThrottlingTest.testMultiLevelDispatch(org.apache.pulsar.broker.service.persistent.PersistentSubscriptionMessageDispatchStreamingDispatcherThrottlingTest)
[2360](https://github.com/apache/pulsar/runs/8115929202?check_suite_focus=true#step:10:2362)
  [INFO]   Run 1: PASS
[2361](https://github.com/apache/pulsar/runs/8115929202?check_suite_focus=true#step:10:2363)
  Error:    Run 2: PersistentSubscriptionMessageDispatchStreamingDispatcherThrottlingTest>SubscriptionMessageDispatchThrottlingTest.testMultiLevelDispatch:503->SubscriptionMessageDispatchThrottlingTest.testDispatchRate:478 expected [true] but found [false]
[2362](https://github.com/apache/pulsar/runs/8115929202?check_suite_focus=true#step:10:2364)
  [INFO]   Run 3: PASS

Are you willing to submit a PR?

• I'm willing to submit a PR!

[tisonkun]

Can be a duplicate of #17225.

[mattisonchao]

same with #17225

[tisonkun]

@mattisonchao you may try to close it as a duplicate following this instruction, instead of closed as completed. This can build a more precise and structural dev events.

[mattisonchao]

Got it, thanks a lot! @tisonkun