TEZ-4394: Netty4 ShuffleHandler: should use 1 boss thread

[abstractdog]

No description provided.

[tez-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	31m 59s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+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.
		_ master Compile Tests _
+1 💚	mvninstall	15m 47s	master passed
+1 💚	compile	0m 31s	master passed with JDK Ubuntu-11.0.17+8-post-Ubuntu-1ubuntu220.04
+1 💚	compile	0m 29s	master passed with JDK Private Build-1.8.0_352-8u352-ga-1~20.04-b08
+1 💚	checkstyle	1m 6s	master passed
+1 💚	javadoc	0m 36s	master passed with JDK Ubuntu-11.0.17+8-post-Ubuntu-1ubuntu220.04
+1 💚	javadoc	0m 26s	master passed with JDK Private Build-1.8.0_352-8u352-ga-1~20.04-b08
+0 🆗	spotbugs	1m 5s	Used deprecated FindBugs config; considering switching to SpotBugs.
+1 💚	findbugs	1m 3s	master passed
		_ Patch Compile Tests _
+1 💚	mvninstall	0m 25s	the patch passed
+1 💚	compile	0m 16s	the patch passed with JDK Ubuntu-11.0.17+8-post-Ubuntu-1ubuntu220.04
+1 💚	javac	0m 16s	the patch passed
+1 💚	compile	0m 15s	the patch passed with JDK Private Build-1.8.0_352-8u352-ga-1~20.04-b08
+1 💚	javac	0m 15s	the patch passed
+1 💚	checkstyle	0m 9s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	javadoc	0m 12s	the patch passed with JDK Ubuntu-11.0.17+8-post-Ubuntu-1ubuntu220.04
+1 💚	javadoc	0m 11s	the patch passed with JDK Private Build-1.8.0_352-8u352-ga-1~20.04-b08
+1 💚	findbugs	0m 34s	the patch passed
		_ Other Tests _
+1 💚	unit	2m 46s	tez-aux-services in the patch passed.
+1 💚	asflicense	0m 14s	The patch does not generate ASF License warnings.
		57m 57s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-256/1/artifact/out/Dockerfile
GITHUB PR	#256
JIRA Issue	TEZ-4394
Optional Tests	dupname asflicense javac javadoc unit spotbugs findbugs checkstyle compile
uname	Linux acf61d876684 4.15.0-200-generic #211-Ubuntu SMP Thu Nov 24 18:16:04 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/tez.sh
git revision	master / 34d6810
Default Java	Private Build-1.8.0_352-8u352-ga-1~20.04-b08
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.17+8-post-Ubuntu-1ubuntu220.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_352-8u352-ga-1~20.04-b08
Test Results	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-256/1/testReport/
Max. process+thread count	1472 (vs. ulimit of 5500)
modules	C: tez-plugins/tez-aux-services U: tez-plugins/tez-aux-services
Console output	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-256/1/console
versions	git=2.25.1 maven=3.6.3 findbugs=3.0.1
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[abstractdog]

btw: hadoop already uses 1 boss thread as expected: https://github.com/apache/hadoop/blob/7a0903b7436e7f3fb4f07c40bed2218a2653ba38/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-shuffle/src/main/java/org/apache/hadoop/mapred/ShuffleHandler.java#L353

[rbalamohan]

LGTM