HDFS-16299. Fix bug for TestDataNodeVolumeMetrics#verifyDataNodeVolum…

[tomscut]

JIRA: HDFS-16299

Fix bug for TestDataNodeVolumeMetrics#verifyDataNodeVolumeMetrics.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	1m 5s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 1s		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 1 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	36m 8s		trunk passed
+1 💚	compile	1m 33s		trunk passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	compile	1m 23s		trunk passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	checkstyle	1m 3s		trunk passed
+1 💚	mvnsite	1m 32s		trunk passed
+1 💚	javadoc	1m 4s		trunk passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javadoc	1m 31s		trunk passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	spotbugs	3m 37s		trunk passed
+1 💚	shadedclient	26m 22s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 20s		the patch passed
+1 💚	compile	1m 28s		the patch passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javac	1m 28s		the patch passed
+1 💚	compile	1m 19s		the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	javac	1m 19s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 55s		the patch passed
+1 💚	mvnsite	1m 23s		the patch passed
+1 💚	javadoc	0m 54s		the patch passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javadoc	1m 27s		the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	spotbugs	3m 39s		the patch passed
+1 💚	shadedclient	25m 46s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
-1 ❌	unit	365m 16s	/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt	hadoop-hdfs in the patch passed.
+1 💚	asflicense	0m 45s		The patch does not generate ASF License warnings.
		476m 37s

Reason	Tests
Failed junit tests	hadoop.hdfs.TestHDFSFileSystemContract

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3616/1/artifact/out/Dockerfile
GITHUB PR	#3616
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell
uname	Linux 3f4f76aa05f7 4.15.0-143-generic #147-Ubuntu SMP Wed Apr 14 16:10:11 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 9aaad95
Default Java	Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3616/1/testReport/
Max. process+thread count	2011 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3616/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[tomscut]

Thanks @goiri for the review.

[tomscut]

Hi @tasanuma @ferhui , could you also help review this. Thanks a lot.

[ayushtkn]

LGTM

[tasanuma]

Merged. Thanks for your contribution, @tomscut. Thanks for your review, @goiri and @ayushtkn.

[tomscut]

Thanks @ayushtkn @tasanuma for your review and merge.