Flaky-test: RackAwareTest.testRackUpdate

Flaky-test: org.apache.pulsar.broker.service.RackAwareTest.testRackUpdate
Number of failures: 6

org.apache.pulsar.broker.service.RackAwareTest is flaky. The testRackUpdate test method fails sporadically.

```
org.apache.bookkeeper.client.BKException$BKNotEnoughBookiesException: Not enough non-faulty bookies available
at org.apache.bookkeeper.client.SyncCallbackUtils.finish(SyncCallbackUtils.java:83)
at org.apache.bookkeeper.client.SyncCallbackUtils$SyncCreateCallback.createComplete(SyncCallbackUtils.java:106)
at org.apache.bookkeeper.client.LedgerCreateOp.createComplete(LedgerCreateOp.java:275)
at org.apache.bookkeeper.client.LedgerCreateOp.initiate(LedgerCreateOp.java:168)
at org.apache.bookkeeper.client.BookKeeper.asyncCreateLedger(BookKeeper.java:879)
at org.apache.bookkeeper.client.BookKeeper.createLedger(BookKeeper.java:963)
at org.apache.bookkeeper.client.BookKeeper.createLedger(BookKeeper.java:918)
at org.apache.pulsar.broker.service.RackAwareTest.testRackUpdate(RackAwareTest.java:282)
```

Usage tip: To enable automatic navigation to failure message, open the following links with CTRL/CMD-click.
[example failure 2022-05-31T23:07:39.3281362Z](https://github.com/apache/pulsar/runs/6679957868?check_suite_focus=true#step:9:815)
[example failure 2022-05-31T19:39:37.9073737Z](https://github.com/apache/pulsar/runs/6677421706?check_suite_focus=true#step:10:801)
[example failure 2022-05-31T15:33:11.8958611Z](https://github.com/apache/pulsar/runs/6673760480?check_suite_focus=true#step:10:801)
[example failure 2022-05-27T14:35:50.7384867Z](https://github.com/apache/pulsar/runs/6627110093?check_suite_focus=true#step:9:811)
[example failure 2022-05-27T11:13:02.3203332Z](https://github.com/apache/pulsar/runs/6623892998?check_suite_focus=true#step:10:790)
[example failure 2022-05-27T10:20:41.5351960Z](https://github.com/apache/pulsar/runs/6623845665?check_suite_focus=true#step:10:800)

Full exception stacktrace

org.apache.bookkeeper.client.BKException$BKNotEnoughBookiesException: Not enough non-faulty bookies available

	at org.apache.bookkeeper.client.SyncCallbackUtils.finish(SyncCallbackUtils.java:83)

	at org.apache.bookkeeper.client.SyncCallbackUtils$SyncCreateCallback.createComplete(SyncCallbackUtils.java:106)

	at org.apache.bookkeeper.client.LedgerCreateOp.createComplete(LedgerCreateOp.java:275)

	at org.apache.bookkeeper.client.LedgerCreateOp.initiate(LedgerCreateOp.java:168)

	at org.apache.bookkeeper.client.BookKeeper.asyncCreateLedger(BookKeeper.java:879)

	at org.apache.bookkeeper.client.BookKeeper.createLedger(BookKeeper.java:963)

	at org.apache.bookkeeper.client.BookKeeper.createLedger(BookKeeper.java:918)

	at org.apache.pulsar.broker.service.RackAwareTest.testRackUpdate(RackAwareTest.java:282)

	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)

Start with org.apache.pulsar.broker.service.RackAwareTest.testRackUpdate, especially the failure at line 282, and run that test repeatedly to reproduce the sporadic BKNotEnoughBookiesException. Trace the rack and bookie setup involved in the test. Done means the test no longer fails intermittently and still verifies rack updates.

Written by the indexing model from the issue text.