Flaky-test: MetadataStoreStatsTest#testBatchMetadataStoreMetrics

[labuladong]

Search before asking

• I searched in the issues and found nothing similar.

Example failure

https://github.com/labuladong/pulsar/actions/runs/3376057575/jobs/5603501145#step:10:1208

Exception stacktrace

Full exception stacktrace

 Error:  Tests run: 7, Failures: 2, Errors: 0, Skipped: 5, Time elapsed: 28.876 s <<< FAILURE! - in org.apache.pulsar.broker.stats.MetadataStoreStatsTest
  Error:  testBatchMetadataStoreMetrics(org.apache.pulsar.broker.stats.MetadataStoreStatsTest)  Time elapsed: 10.577 s  <<< FAILURE!
  java.lang.AssertionError: expected object to not be null
  	at org.testng.Assert.fail(Assert.java:99)
  	at org.testng.Assert.assertNotNull(Assert.java:942)
  	at org.testng.Assert.assertNotNull(Assert.java:926)
  	at org.apache.pulsar.broker.stats.MetadataStoreStatsTest.testBatchMetadataStoreMetrics(MetadataStoreStatsTest.java:185)
  	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
  	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
  	at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
  	at org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
  	at org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
  	at org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
  	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
  	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
  	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
  	at java.base/java.lang.Thread.run(Thread.java:833)

Are you willing to submit a PR?

• I'm willing to submit a PR!

[labuladong]

I notice this test is added in #17072 yesterday.

cc @tjiuming

[poorbarcode]

another one:

• https://github.com/apache/pulsar/actions/runs/3437251092/jobs/5731951247

[tjiuming]

sorry for missed the issue, I'll check it later

[BewareMyPower]

Another one: https://github.com/apache/pulsar/actions/runs/3471025967/jobs/5800196390

[coderzc]

Another one: https://github.com/apache/pulsar/actions/runs/3496355710/jobs/5854319305

[tjiuming]

cannot reproduce the issue on my local.
When MetadataStoreConfig#metadataStoreName is a empty string, this issue happens, but I've checked everywhere, the field must not be empty

[github-actions]

The issue had no activity for 30 days, mark with Stale label.

[lhotari]

Yet another one: https://github.com/apache/pulsar/actions/runs/3995672027/jobs/6855066875#step:11:1233

[lhotari]

cannot reproduce the issue on my local. When MetadataStoreConfig#metadataStoreName is a empty string, this issue happens, but I've checked everywhere, the field must not be empty

@tjiuming This was fairly easy to reproduce with @Test(invocations = 100). I created a fix in #19329. Please review