Avoid initializing useless HashMap in protocolImplMapArray.

[hfutatzhanghb]

Description of PR

Avoid initializing useless HashMap in protocolImplMapArray.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	6m 55s		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	32m 30s		trunk passed
+1 💚	compile	9m 14s		trunk passed with JDK Ubuntu-11.0.23+9-post-Ubuntu-1ubuntu120.04.2
+1 💚	compile	8m 6s		trunk passed with JDK Private Build-1.8.0_412-8u412-ga-1~20.04.1-b08
+1 💚	checkstyle	0m 43s		trunk passed
+1 💚	mvnsite	0m 59s		trunk passed
+1 💚	javadoc	0m 44s		trunk passed with JDK Ubuntu-11.0.23+9-post-Ubuntu-1ubuntu120.04.2
+1 💚	javadoc	0m 31s		trunk passed with JDK Private Build-1.8.0_412-8u412-ga-1~20.04.1-b08
+1 💚	spotbugs	1m 27s		trunk passed
+1 💚	shadedclient	21m 12s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 31s		the patch passed
+1 💚	compile	8m 27s		the patch passed with JDK Ubuntu-11.0.23+9-post-Ubuntu-1ubuntu120.04.2
+1 💚	javac	8m 27s		the patch passed
+1 💚	compile	8m 10s		the patch passed with JDK Private Build-1.8.0_412-8u412-ga-1~20.04.1-b08
+1 💚	javac	8m 10s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	0m 38s	/results-checkstyle-hadoop-common-project_hadoop-common.txt	hadoop-common-project/hadoop-common: The patch generated 1 new + 151 unchanged - 1 fixed = 152 total (was 152)
+1 💚	mvnsite	0m 53s		the patch passed
+1 💚	javadoc	0m 44s		the patch passed with JDK Ubuntu-11.0.23+9-post-Ubuntu-1ubuntu120.04.2
+1 💚	javadoc	0m 35s		the patch passed with JDK Private Build-1.8.0_412-8u412-ga-1~20.04.1-b08
+1 💚	spotbugs	1m 34s		the patch passed
+1 💚	shadedclient	20m 53s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	16m 33s		hadoop-common in the patch passed.
+1 💚	asflicense	0m 41s		The patch does not generate ASF License warnings.
		142m 43s

Subsystem	Report/Notes
Docker	ClientAPI=1.46 ServerAPI=1.46 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6927/1/artifact/out/Dockerfile
GITHUB PR	#6927
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 001731ace016 5.15.0-106-generic #116-Ubuntu SMP Wed Apr 17 09:17:56 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / b5d4b0d
Default Java	Private Build-1.8.0_412-8u412-ga-1~20.04.1-b08
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.23+9-post-Ubuntu-1ubuntu120.04.2 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_412-8u412-ga-1~20.04.1-b08
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6927/1/testReport/
Max. process+thread count	1721 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common U: hadoop-common-project/hadoop-common
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6927/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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