HADOOP-19922. Add configurable warn threshold for large IPC RPC request data length

[cxzl25]

Description of PR

The IPC Server currently enforces a hard upper limit on RPC request size via ipc.maximum.data.length (default 128 MB). Requests that exceed this limit are rejected immediately. However, requests that are abnormally large but still within the limit pass through silently, potentially causing GC pressure and cascading failures before any operator is aware.

How was this patch tested?

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• If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

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[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 54s		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.
+0 🆗	xmllint	0m 1s		xmllint 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	47m 43s		trunk passed
+1 💚	compile	17m 18s		trunk passed with JDK Ubuntu-21.0.11+10-1-24.04.2-Ubuntu
+1 💚	compile	17m 59s		trunk passed with JDK Ubuntu-17.0.19+10-1-24.04.2-Ubuntu
+1 💚	checkstyle	1m 30s		trunk passed
+1 💚	mvnsite	1m 59s		trunk passed
+1 💚	javadoc	1m 25s		trunk passed with JDK Ubuntu-21.0.11+10-1-24.04.2-Ubuntu
+1 💚	javadoc	1m 21s		trunk passed with JDK Ubuntu-17.0.19+10-1-24.04.2-Ubuntu
+1 💚	spotbugs	3m 14s		trunk passed
+1 💚	shadedclient	36m 52s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 15s		the patch passed
+1 💚	compile	16m 30s		the patch passed with JDK Ubuntu-21.0.11+10-1-24.04.2-Ubuntu
+1 💚	javac	16m 30s		the patch passed
+1 💚	compile	18m 4s		the patch passed with JDK Ubuntu-17.0.19+10-1-24.04.2-Ubuntu
+1 💚	javac	18m 4s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	1m 27s		the patch passed
+1 💚	mvnsite	1m 59s		the patch passed
+1 💚	javadoc	1m 23s		the patch passed with JDK Ubuntu-21.0.11+10-1-24.04.2-Ubuntu
+1 💚	javadoc	1m 22s		the patch passed with JDK Ubuntu-17.0.19+10-1-24.04.2-Ubuntu
+1 💚	spotbugs	3m 22s		the patch passed
+1 💚	shadedclient	36m 49s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	24m 6s		hadoop-common in the patch passed.
+1 💚	asflicense	1m 12s		The patch does not generate ASF License warnings.
		239m 4s

Subsystem	Report/Notes
Docker	ClientAPI=1.54 ServerAPI=1.54 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8553/1/artifact/out/Dockerfile
GITHUB PR	#8553
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets xmllint
uname	Linux e3c720f6ef2e 5.15.0-174-generic #184-Ubuntu SMP Fri Mar 13 18:41:50 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 0141ddd
Default Java	Ubuntu-17.0.19+10-1-24.04.2-Ubuntu
Multi-JDK versions	/usr/lib/jvm/java-21-openjdk-amd64:Ubuntu-21.0.11+10-1-24.04.2-Ubuntu /usr/lib/jvm/java-17-openjdk-amd64:Ubuntu-17.0.19+10-1-24.04.2-Ubuntu
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8553/1/testReport/
Max. process+thread count	1273 (vs. ulimit of 10000)
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-8553/1/console
versions	git=2.43.0 maven=3.9.15 spotbugs=4.9.7
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