[fix][test] Flaky-test: ManagedLedgerTest.testTimestampOnWorkingLedger

[shibd]

Motivation

#22430

After #22034, When the ledger is closed due to full entry, will trigger create a new ledger, However, since the creation of the ledger is asynchronous, sometimes the last ledger is not created before the function returns.

pulsar/managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java

Lines 1775 to 1778 in 57a616e

	// Use the executor here is to avoid use the Zookeeper thread to create the ledger which will lead
	// to deadlock at the zookeeper client, details to see https://github.com/apache/pulsar/issues/13736
	this.executor.execute(() ->
	asyncCreateLedger(bookKeeper, config, digestType, this, Collections.emptyMap()));

For this test: ml.close(); is no make sure that the currentLedger switch successful, and there are two possible case:

• Case1: [Ledger01{entry1}], [Ledger02{entry1}], [Ledger03{}]
• Case2: [Ledger01{entry1}], [Ledger02{entry1}]

Case 1 will cause the test to fail.

Modifications

When ml.close to reopen a new ManagerLedger that will make sure into Case1, and then to assert timestamp of Ledger02 than 0.

Verifying this change

• Run this test locally 1000 times always successful.

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

Matching PR in forked repository

PR in forked repository:

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.92%. Comparing base (bbc6224) to head (d8cdd6e).
Report is 193 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #22600      +/-   ##
============================================
+ Coverage     73.57%   73.92%   +0.34%     
+ Complexity    32624    32606      -18     
============================================
  Files          1877     1885       +8     
  Lines        139502   140524    +1022     
  Branches      15299    15452     +153     
============================================
+ Hits         102638   103877    +1239     
+ Misses        28908    28600     -308     
- Partials       7956     8047      +91     

Flag	Coverage Δ
inttests	26.99% <ø> (+2.41%)	⬆️
systests	24.39% <ø> (+0.07%)	⬆️
unittests	73.21% <ø> (+0.37%)	⬆️

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