HADOOP-17629. TestRPC#testAuthorization fails.

[szetszwo]

Description of PR

TestRPC#testAuthorization fails with below IOException. It was using WritableRpcEngine to run TestProtobufRpcProto.

java.io.IOException: protocolClass interface org.apache.hadoop.ipc.TestRpcBase$TestRpcService is not implemented by protocolImpl which is of class class org.apache.hadoop.ipc.protobuf.TestRpcServiceProtos$TestProtobufRpcProto$2

	at org.apache.hadoop.ipc.WritableRpcEngine$Server.<init>(WritableRpcEngine.java:523)
	at org.apache.hadoop.ipc.WritableRpcEngine.getServer(WritableRpcEngine.java:379)
	at org.apache.hadoop.ipc.RPC$Builder.build(RPC.java:986)
	at org.apache.hadoop.ipc.TestRpcBase.setupTestServer(TestRpcBase.java:124)
	at org.apache.hadoop.ipc.TestRpcBase.setupTestServer(TestRpcBase.java:119)
	at org.apache.hadoop.ipc.TestRpcBase.setupTestServer(TestRpcBase.java:102)
	at org.apache.hadoop.ipc.TestRPC.doRPCs(TestRPC.java:646)
	at org.apache.hadoop.ipc.TestRPC.testAuthorization(TestRPC.java:705)
	...

How was this patch tested?

This is fixing a test failure.

For code changes:

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

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 37s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 1s		codespell was not available.
+0 🆗	detsecrets	0m 1s		detect-secrets 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	48m 13s		trunk passed
+1 💚	compile	16m 20s		trunk passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	compile	13m 37s		trunk passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	checkstyle	1m 3s		trunk passed
+1 💚	mvnsite	1m 41s		trunk passed
+1 💚	javadoc	1m 17s		trunk passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	javadoc	0m 56s		trunk passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	spotbugs	2m 39s		trunk passed
+1 💚	shadedclient	36m 34s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 57s		the patch passed
+1 💚	compile	15m 6s		the patch passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	javac	15m 6s		the patch passed
+1 💚	compile	13m 58s		the patch passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	javac	13m 58s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 54s		the patch passed
+1 💚	mvnsite	1m 40s		the patch passed
+1 💚	javadoc	1m 15s		the patch passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	javadoc	0m 55s		the patch passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	spotbugs	2m 43s		the patch passed
+1 💚	shadedclient	36m 22s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	22m 42s		hadoop-common in the patch passed.
+1 💚	asflicense	1m 6s		The patch does not generate ASF License warnings.
		221m 55s

Subsystem	Report/Notes
Docker	ClientAPI=1.51 ServerAPI=1.51 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8004/1/artifact/out/Dockerfile
GITHUB PR	#8004
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 4a8480643114 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 / 5d8f79a
Default Java	Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8004/1/testReport/
Max. process+thread count	3152 (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-8004/1/console
versions	git=2.25.1 maven=3.9.11 spotbugs=4.2.2
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[szetszwo]

@slfan1989 , thanks a lot for reviewing this!