HADOOP-19863. Incorrect Vectored IO metrics from Local Filesystem. (#8447)

[steveloughran]

…

Contributed by Steve Loughran.

For code changes:

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[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	1m 1s		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 appears to include 2 new or modified test files.
			_ branch-3.5 Compile Tests _
+1 💚	mvninstall	42m 58s		branch-3.5 passed
+1 💚	compile	15m 55s		branch-3.5 passed with JDK Ubuntu-21.0.10+7-Ubuntu-124.04
+1 💚	compile	16m 14s		branch-3.5 passed with JDK Ubuntu-17.0.18+8-Ubuntu-124.04.1
+1 💚	checkstyle	1m 30s		branch-3.5 passed
+1 💚	mvnsite	1m 56s		branch-3.5 passed
+1 💚	javadoc	1m 30s		branch-3.5 passed with JDK Ubuntu-21.0.10+7-Ubuntu-124.04
+1 💚	javadoc	1m 26s		branch-3.5 passed with JDK Ubuntu-17.0.18+8-Ubuntu-124.04.1
+1 💚	spotbugs	3m 10s		branch-3.5 passed
+1 💚	shadedclient	30m 49s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 11s		the patch passed
+1 💚	compile	15m 19s		the patch passed with JDK Ubuntu-21.0.10+7-Ubuntu-124.04
+1 💚	javac	15m 19s		the patch passed
+1 💚	compile	16m 25s		the patch passed with JDK Ubuntu-17.0.18+8-Ubuntu-124.04.1
+1 💚	javac	16m 25s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	1m 26s		the patch passed
+1 💚	mvnsite	1m 55s		the patch passed
+1 💚	javadoc	1m 28s		the patch passed with JDK Ubuntu-21.0.10+7-Ubuntu-124.04
+1 💚	javadoc	1m 28s		the patch passed with JDK Ubuntu-17.0.18+8-Ubuntu-124.04.1
+1 💚	spotbugs	3m 22s		the patch passed
+1 💚	shadedclient	30m 51s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	22m 58s		hadoop-common in the patch passed.
+1 💚	asflicense	1m 16s		The patch does not generate ASF License warnings.
		215m 24s

Subsystem	Report/Notes
Docker	ClientAPI=1.54 ServerAPI=1.54 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8496/1/artifact/out/Dockerfile
GITHUB PR	#8496
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 775a870acedd 5.15.0-173-generic #183-Ubuntu SMP Fri Mar 6 13:29:34 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	branch-3.5 / aa7c7f7
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-8496/1/testReport/
Max. process+thread count	1285 (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-8496/1/console
versions	git=2.43.0 maven=3.9.15 spotbugs=4.9.7
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