HADOOP-17861. improve YARN Registry DNS Server qps

[eubnara]

Description of PR

There are some points to improve the performance of YARN Registry DNS Server.

• Do not print unnecessary logs (It just needs change log4j.properties)
  • log4j.logger.org.apache.hadoop.registry.server.dns=WARN
• Change some loglevels at points which can affect performance degradation.
• Use "newFixedThreadPool" instead of "newCachedThreadPool" to prevent OOM
• Use Blocking on TCP handler. Using non-blocking and sleeping some time("Thread.sleep(500)") is meaningless.

In our environment, QPS of original yarn dns server is about 5000 (UDP), 100 (TCP).
Now, QPS of our improved yarn dns server is about 47000 (UDP), 500 (TCP).

I will make a pull request at https://github.com/apache/hadoop soon.

How was this patch tested?

Our team members have tested this manually in our cluster.

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?

[eubnara]

If the response of UDP query exceeds limit, TC(truncated) flag should be set in order for the client to request again with TCP query.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 42s		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 doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.
			_ trunk Compile Tests _
+1 💚	mvninstall	21m 36s		trunk passed
+1 💚	compile	9m 2s		trunk passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	compile	8m 45s		trunk passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	checkstyle	0m 21s		trunk passed
+1 💚	mvnsite	0m 25s		trunk passed
+1 💚	javadoc	0m 26s		trunk passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javadoc	0m 27s		trunk passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
-1 ❌	spotbugs	0m 35s	/branch-spotbugs-hadoop-common-project_hadoop-registry-warnings.html	hadoop-common-project/hadoop-registry in trunk has 19 extant spotbugs warnings.
+1 💚	shadedclient	14m 19s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 13s		the patch passed
+1 💚	compile	8m 20s		the patch passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javac	8m 20s		the patch passed
+1 💚	compile	8m 44s		the patch passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	javac	8m 44s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	0m 20s	/results-checkstyle-hadoop-common-project_hadoop-registry.txt	hadoop-common-project/hadoop-registry: The patch generated 1 new + 2 unchanged - 0 fixed = 3 total (was 2)
+1 💚	mvnsite	0m 23s		the patch passed
-1 ❌	javadoc	0m 23s	/results-javadoc-javadoc-hadoop-common-project_hadoop-registry-jdkUbuntu-21.0.7+6-Ubuntu-0ubuntu120.04.txt	hadoop-common-project_hadoop-registry-jdkUbuntu-21.0.7+6-Ubuntu-0ubuntu120.04 with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04 generated 1 new + 136 unchanged - 0 fixed = 137 total (was 136)
-1 ❌	javadoc	0m 22s	/results-javadoc-javadoc-hadoop-common-project_hadoop-registry-jdkUbuntu-17.0.15+6-Ubuntu-0ubuntu120.04.txt	hadoop-common-project_hadoop-registry-jdkUbuntu-17.0.15+6-Ubuntu-0ubuntu120.04 with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04 generated 1 new + 129 unchanged - 0 fixed = 130 total (was 129)
-1 ❌	spotbugs	0m 40s	/new-spotbugs-hadoop-common-project_hadoop-registry.html	hadoop-common-project/hadoop-registry generated 1 new + 19 unchanged - 0 fixed = 20 total (was 19)
+1 💚	shadedclient	14m 32s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	0m 54s		hadoop-registry in the patch passed.
-1 ❌	asflicense	0m 34s	/results-asflicense.txt	The patch generated 1 ASF License warnings.
		95m 0s

Reason	Tests
SpotBugs	module:hadoop-common-project/hadoop-registry
	Exceptional return value of java.util.concurrent.ExecutorService.submit(Callable) ignored in org.apache.hadoop.registry.server.dns.RegistryDNS.serveNIOUDP(DatagramChannel) At RegistryDNS.java:ignored in org.apache.hadoop.registry.server.dns.RegistryDNS.serveNIOUDP(DatagramChannel) At RegistryDNS.java:[line 1027]

Subsystem	Report/Notes
Docker	ClientAPI=1.52 ServerAPI=1.52 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8106/1/artifact/out/Dockerfile
GITHUB PR	#8106
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux b6793247efa2 5.15.0-156-generic #166-Ubuntu SMP Sat Aug 9 00:02:46 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 5d6fa72
Default Java	Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
Multi-JDK versions	/usr/lib/jvm/java-21-openjdk-amd64:Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04 /usr/lib/jvm/java-17-openjdk-amd64:Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8106/1/testReport/
Max. process+thread count	643 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-registry U: hadoop-common-project/hadoop-registry
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8106/1/console
versions	git=2.25.1 maven=3.9.11 spotbugs=4.9.7
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