HDFS-16171. De-flake testDecommissionStatus (#3280)

[virajjasani]

Description of PR

testDecommissionStatus keeps failing intermittently.

[ERROR] testDecommissionStatus(org.apache.hadoop.hdfs.server.namenode.TestDecommissioningStatusWithBackoffMonitor)  Time elapsed: 3.299 s  <<< FAILURE!
java.lang.AssertionError: Unexpected num under-replicated blocks expected:<4> but was:<3>
	at org.junit.Assert.fail(Assert.java:89)
	at org.junit.Assert.failNotEquals(Assert.java:835)
	at org.junit.Assert.assertEquals(Assert.java:647)
	at org.apache.hadoop.hdfs.server.namenode.TestDecommissioningStatus.checkDecommissionStatus(TestDecommissioningStatus.java:169)
	at org.apache.hadoop.hdfs.server.namenode.TestDecommissioningStatusWithBackoffMonitor.testDecommissionStatus(TestDecommissioningStatusWithBackoffMonitor.java:136)

How was this patch tested?

Local run of unit test

For code changes:

• Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?

[aajisaka]

+1 pending Jenkins. Thank you @virajjasani

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	9m 4s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 2 new or modified test files.
			_ branch-3.2 Compile Tests _
+0 🆗	mvndep	3m 32s		Maven dependency ordering for branch
+1 💚	mvninstall	25m 12s		branch-3.2 passed
+1 💚	compile	16m 52s		branch-3.2 passed
+1 💚	checkstyle	2m 41s		branch-3.2 passed
+1 💚	mvnsite	2m 59s		branch-3.2 passed
+1 💚	javadoc	2m 25s		branch-3.2 passed
+1 💚	spotbugs	5m 35s		branch-3.2 passed
+1 💚	shadedclient	16m 21s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 26s		Maven dependency ordering for patch
+1 💚	mvninstall	2m 5s		the patch passed
+1 💚	compile	16m 12s		the patch passed
+1 💚	javac	16m 12s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	2m 39s		root: The patch generated 0 new + 19 unchanged - 1 fixed = 19 total (was 20)
+1 💚	mvnsite	2m 57s		the patch passed
+1 💚	javadoc	2m 26s		the patch passed
+1 💚	spotbugs	6m 1s		the patch passed
+1 💚	shadedclient	17m 18s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	16m 46s		hadoop-common in the patch passed.
-1 ❌	unit	193m 37s	/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt	hadoop-hdfs in the patch failed.
+1 💚	asflicense	1m 6s		The patch does not generate ASF License warnings.
		344m 35s

Reason	Tests
Failed junit tests	hadoop.hdfs.server.namenode.TestFsck
	hadoop.hdfs.TestReconstructStripedFile
	hadoop.hdfs.TestDatanodeRegistration
	hadoop.hdfs.TestBlockStoragePolicy
	hadoop.hdfs.server.namenode.ha.TestRetryCacheWithHA
	hadoop.hdfs.TestDFSInotifyEventInputStreamKerberized
	hadoop.hdfs.server.namenode.ha.TestHAAppend

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3720/1/artifact/out/Dockerfile
GITHUB PR	#3720
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell
uname	Linux bd0dac9b3486 4.15.0-156-generic #163-Ubuntu SMP Thu Aug 19 23:31:58 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	branch-3.2 / d8c0b5b
Default Java	Private Build-1.8.0_292-8u292-b10-0ubuntu1~18.04-b10
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3720/1/testReport/
Max. process+thread count	3393 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common hadoop-hdfs-project/hadoop-hdfs U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3720/1/console
versions	git=2.17.1 maven=3.6.0 spotbugs=4.2.2
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[aajisaka]

The test failures are unrelated. I'll merge this.