MAPREDUCE-7468. [Addendum] Fix TestMapReduceChildJVM unit tests.

[brumi1024]

Description of PR

Addendum commit to fix TestMapReduceChildJVM's UTs that were broken in MAPREDUCE-7468.

How was this patch tested?

For code changes:

• Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
• If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

[tomicooler]

Thanks for the fix. LGTM.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 23s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets 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	34m 32s	/branch-mvninstall-root.txt	root in trunk failed.
+1 💚	compile	0m 18s		trunk passed with JDK Ubuntu-11.0.21+9-post-Ubuntu-0ubuntu120.04
+1 💚	compile	0m 17s		trunk passed with JDK Private Build-1.8.0_392-8u392-ga-1~20.04-b08
+1 💚	checkstyle	0m 19s		trunk passed
+1 💚	mvnsite	0m 21s		trunk passed
+1 💚	javadoc	0m 24s		trunk passed with JDK Ubuntu-11.0.21+9-post-Ubuntu-0ubuntu120.04
+1 💚	javadoc	0m 18s		trunk passed with JDK Private Build-1.8.0_392-8u392-ga-1~20.04-b08
+1 💚	spotbugs	0m 35s		trunk passed
+1 💚	shadedclient	23m 3s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 16s		the patch passed
+1 💚	compile	0m 16s		the patch passed with JDK Ubuntu-11.0.21+9-post-Ubuntu-0ubuntu120.04
+1 💚	javac	0m 16s		the patch passed
+1 💚	compile	0m 14s		the patch passed with JDK Private Build-1.8.0_392-8u392-ga-1~20.04-b08
+1 💚	javac	0m 14s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	0m 11s	/results-checkstyle-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-app.txt	hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app: The patch generated 1 new + 31 unchanged - 1 fixed = 32 total (was 32)
+1 💚	mvnsite	0m 16s		the patch passed
+1 💚	javadoc	0m 12s		the patch passed with JDK Ubuntu-11.0.21+9-post-Ubuntu-0ubuntu120.04
+1 💚	javadoc	0m 13s		the patch passed with JDK Private Build-1.8.0_392-8u392-ga-1~20.04-b08
+1 💚	spotbugs	0m 42s		the patch passed
+1 💚	shadedclient	21m 45s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	6m 27s		hadoop-mapreduce-client-app in the patch passed.
+1 💚	asflicense	0m 22s		The patch does not generate ASF License warnings.
		94m 6s

Subsystem	Report/Notes
Docker	ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6451/1/artifact/out/Dockerfile
GITHUB PR	#6451
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 34de9a77bb74 5.15.0-88-generic #98-Ubuntu SMP Mon Oct 2 15:18:56 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 9653467
Default Java	Private Build-1.8.0_392-8u392-ga-1~20.04-b08
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.21+9-post-Ubuntu-0ubuntu120.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_392-8u392-ga-1~20.04-b08
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6451/1/testReport/
Max. process+thread count	738 (vs. ulimit of 5500)
modules	C: hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app U: hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6451/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[brumi1024]

The mvn issue is unrelated, Apache Hadoop YARN Application Catalog Webapp's build failed with: "Could not extract the Node archive", the archive had some issues. Merging to trunk, as the relevant part of the build succeeded and the UTs are fixed.