MAPREDUCE-7486. Add fast-fail guidance when cluster storage capacity is exceeded.

[deepujain]

Summary

This patch improves the logging path in YarnChild.reportError() when ClusterStorageCapacityExceededException is raised and fast fail is disabled. The task now emits a warning that explains why the job is not failing immediately and points users to the configuration that enables fast fail.

Change

• hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapred/YarnChild.java: add a warning log message for the non-fast-fail capacity-exceeded path.
• hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapred/TestYarnChild.java: extend the unit coverage to assert the warning path and preserve the existing fatal-error behavior checks.

Tests

• JAVA_HOME=/opt/homebrew/opt/openjdk /opt/homebrew/bin/mvn -Dmaven.repo.local=/tmp/codex-m2 test -pl hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app -am -Dtest=TestYarnChild -DskipTests=false

JIRA

Fixes MAPREDUCE-7486

[deepujain]

Added a warning when cluster storage capacity is exceeded but fast fail is disabled, so users get guidance on enabling it. TestYarnChild passes locally with mvn -Dmaven.repo.local=/tmp/codex-m2 test -pl hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app -am -Dtest=TestYarnChild -DskipTests=false. Ready for CI.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 22s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 1s		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 appears to include 1 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	30m 15s		trunk passed
+1 💚	compile	0m 28s		trunk passed with JDK Ubuntu-21.0.10+7-Ubuntu-124.04
+1 💚	compile	0m 29s		trunk passed with JDK Ubuntu-17.0.18+8-Ubuntu-124.04.1
+1 💚	checkstyle	0m 30s		trunk passed
+1 💚	mvnsite	0m 32s		trunk passed
+1 💚	javadoc	0m 28s		trunk passed with JDK Ubuntu-21.0.10+7-Ubuntu-124.04
+1 💚	javadoc	0m 26s		trunk passed with JDK Ubuntu-17.0.18+8-Ubuntu-124.04.1
+1 💚	spotbugs	0m 47s		trunk passed
+1 💚	shadedclient	20m 0s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 17s		the patch passed
+1 💚	compile	0m 19s		the patch passed with JDK Ubuntu-21.0.10+7-Ubuntu-124.04
+1 💚	javac	0m 19s		the patch passed
+1 💚	compile	0m 22s		the patch passed with JDK Ubuntu-17.0.18+8-Ubuntu-124.04.1
+1 💚	javac	0m 22s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 14s		the patch passed
+1 💚	mvnsite	0m 17s		the patch passed
+1 💚	javadoc	0m 15s		the patch passed with JDK Ubuntu-21.0.10+7-Ubuntu-124.04
+1 💚	javadoc	0m 19s		the patch passed with JDK Ubuntu-17.0.18+8-Ubuntu-124.04.1
+1 💚	spotbugs	0m 46s		the patch passed
+1 💚	shadedclient	19m 32s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	6m 27s		hadoop-mapreduce-client-app in the patch passed.
+1 💚	asflicense	0m 20s		The patch does not generate ASF License warnings.
		84m 55s

Subsystem	Report/Notes
Docker	ClientAPI=1.54 ServerAPI=1.54 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8388/1/artifact/out/Dockerfile
GITHUB PR	#8388
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 39900e9a0038 5.15.0-171-generic #181-Ubuntu SMP Fri Feb 6 22:44:50 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / a8e254c
Default Java	Ubuntu-17.0.18+8-Ubuntu-124.04.1
Multi-JDK versions	/usr/lib/jvm/java-21-openjdk-amd64:Ubuntu-21.0.10+7-Ubuntu-124.04 /usr/lib/jvm/java-17-openjdk-amd64:Ubuntu-17.0.18+8-Ubuntu-124.04.1
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8388/1/testReport/
Max. process+thread count	718 (vs. ulimit of 10000)
modules	C: hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app U: hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8388/1/console
versions	git=2.43.0 maven=3.9.11 spotbugs=4.9.7
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