YARN-10720. (branch-2.10) YARN WebAppProxyServlet should support connection timeout…

[aajisaka]

… to prevent proxy server from hanging. Contributed by Qi Zhu.

(cherry picked from commit a0deda1)

Conflicts:
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-web-proxy/src/main/java/org/apache/hadoop/yarn/server/webproxy/WebAppProxyServlet.java
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-web-proxy/src/test/java/org/apache/hadoop/yarn/server/webproxy/TestWebAppProxyServlet.java

(cherry picked from commit dbeb41b)

Conflicts:
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-web-proxy/src/test/java/org/apache/hadoop/yarn/server/webproxy/TestWebAppProxyServlet.java

Description of PR

Backport YARN-10720 to branch-2.10. This PR is to run the precommit job for this backport. I also opened #4102 to backport to branch-3.2.

How was this patch tested?

Ran TestWebAppProxyServlet locally.

For code changes:

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

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	11m 33s		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.
			_ branch-2.10 Compile Tests _
+0 🆗	mvndep	2m 14s		Maven dependency ordering for branch
+1 💚	mvninstall	12m 43s		branch-2.10 passed
+1 💚	compile	8m 19s		branch-2.10 passed with JDK Azul Systems, Inc.-1.7.0_262-b10
+1 💚	compile	6m 55s		branch-2.10 passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~18.04-b07
+1 💚	checkstyle	0m 57s		branch-2.10 passed
+1 💚	mvnsite	1m 57s		branch-2.10 passed
+1 💚	javadoc	1m 54s		branch-2.10 passed with JDK Azul Systems, Inc.-1.7.0_262-b10
+1 💚	javadoc	1m 33s		branch-2.10 passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~18.04-b07
+1 💚	spotbugs	3m 54s		branch-2.10 passed
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 19s		Maven dependency ordering for patch
+1 💚	mvninstall	1m 25s		the patch passed
+1 💚	compile	7m 53s		the patch passed with JDK Azul Systems, Inc.-1.7.0_262-b10
+1 💚	javac	7m 53s		hadoop-yarn-project_hadoop-yarn-jdkAzulSystems,Inc.-1.7.0_262-b10 with JDK Azul Systems, Inc.-1.7.0_262-b10 generated 0 new + 138 unchanged - 10 fixed = 138 total (was 148)
+1 💚	compile	6m 39s		the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~18.04-b07
+1 💚	javac	6m 39s		hadoop-yarn-project_hadoop-yarn-jdkPrivateBuild-1.8.0_312-8u312-b07-0ubuntu118.04-b07 with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu118.04-b07 generated 0 new + 128 unchanged - 10 fixed = 128 total (was 138)
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	0m 54s	/results-checkstyle-hadoop-yarn-project_hadoop-yarn.txt	hadoop-yarn-project/hadoop-yarn: The patch generated 1 new + 231 unchanged - 0 fixed = 232 total (was 231)
+1 💚	mvnsite	1m 48s		the patch passed
+1 💚	xml	0m 1s		The patch has no ill-formed XML file.
+1 💚	javadoc	1m 45s		the patch passed with JDK Azul Systems, Inc.-1.7.0_262-b10
+1 💚	javadoc	1m 27s		the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~18.04-b07
+1 💚	spotbugs	4m 18s		the patch passed
			_ Other Tests _
+1 💚	unit	0m 42s		hadoop-yarn-api in the patch passed.
+1 💚	unit	3m 14s		hadoop-yarn-common in the patch passed.
+1 💚	unit	0m 36s		hadoop-yarn-server-web-proxy in the patch passed.
+1 💚	asflicense	0m 38s		The patch does not generate ASF License warnings.
		88m 45s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4103/1/artifact/out/Dockerfile
GITHUB PR	#4103
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell xml
uname	Linux cd09d98a63a0 4.15.0-163-generic #171-Ubuntu SMP Fri Nov 5 11:55:11 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	branch-2.10 / bbf1250
Default Java	Private Build-1.8.0_312-8u312-b07-0ubuntu1~18.04-b07
Multi-JDK versions	/usr/lib/jvm/zulu-7-amd64:Azul Systems, Inc.-1.7.0_262-b10 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_312-8u312-b07-0ubuntu1~18.04-b07
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4103/1/testReport/
Max. process+thread count	111 (vs. ulimit of 5500)
modules	C: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-web-proxy U: hadoop-yarn-project/hadoop-yarn
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4103/1/console
versions	git=2.17.1 maven=3.6.0 spotbugs=4.2.2
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