MAPREDUCE-7334. TestJobEndNotifier fails.

[aajisaka]

Reduced the sleep time from 1000 to 3 seconds to shut down HttpServer2 gracefully.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 55s		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 1 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	35m 7s		trunk passed
+1 💚	compile	0m 37s		trunk passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	compile	0m 31s		trunk passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	checkstyle	0m 31s		trunk passed
+1 💚	mvnsite	0m 40s		trunk passed
+1 💚	javadoc	0m 20s		trunk passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	javadoc	0m 19s		trunk passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	spotbugs	1m 17s		trunk passed
+1 💚	shadedclient	17m 1s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 31s		the patch passed
+1 💚	compile	0m 31s		the patch passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	javac	0m 31s		the patch passed
+1 💚	compile	0m 27s		the patch passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	javac	0m 27s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 24s		the patch passed
+1 💚	mvnsite	0m 30s		the patch passed
+1 💚	javadoc	0m 14s		the patch passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	javadoc	0m 13s		the patch passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	spotbugs	1m 17s		the patch passed
+1 💚	shadedclient	16m 32s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	7m 0s		hadoop-mapreduce-client-core in the patch passed.
+1 💚	asflicense	0m 28s		The patch does not generate ASF License warnings.
		85m 38s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2877/1/artifact/out/Dockerfile
GITHUB PR	#2877
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell
uname	Linux 2ed6c7822299 4.15.0-136-generic #140-Ubuntu SMP Thu Jan 28 05:20:47 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 9e0f08a
Default Java	Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2877/1/testReport/
Max. process+thread count	1086 (vs. ulimit of 5500)
modules	C: hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core U: hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2877/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[aajisaka]

@Jing9 #2145 broke this test. Would you check this?