MAPREDUCE-7531. TestMRJobs.testThreadDumpOnTaskTimeout flaky due to thread dump delayed write.

[slfan1989]

Description of PR

How was this patch tested?

MAPREDUCE-7531. TestMRJobs.testThreadDumpOnTaskTimeout flaky due to thread dump delayed write.

[INFO] 
[INFO] -------------------------------------------------------
[INFO]  T E S T S
[INFO] -------------------------------------------------------
[INFO] Running org.apache.hadoop.mapreduce.v2.TestUberAM
[INFO] Tests run: 21, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 773.2 s -- in org.apache.hadoop.mapreduce.v2.TestUberAM
[INFO] 
[INFO] Results:
[INFO] 
[INFO] Tests run: 21, Failures: 0, Errors: 0, Skipped: 0
[INFO] 
[INFO] ------------------------------------------------------------------------

For code changes:

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• Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
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[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	1m 0s		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 2 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	49m 54s		trunk passed
+1 💚	compile	0m 57s		trunk passed with JDK Ubuntu-21.0.10+7-Ubuntu-124.04
+1 💚	compile	0m 58s		trunk passed with JDK Ubuntu-17.0.18+8-Ubuntu-124.04.1
+1 💚	checkstyle	0m 57s		trunk passed
+1 💚	mvnsite	1m 0s		trunk passed
+1 💚	javadoc	0m 52s		trunk passed with JDK Ubuntu-21.0.10+7-Ubuntu-124.04
+1 💚	javadoc	0m 50s		trunk passed with JDK Ubuntu-17.0.18+8-Ubuntu-124.04.1
+1 💚	spotbugs	1m 17s		trunk passed
+1 💚	shadedclient	33m 18s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 32s		the patch passed
+1 💚	compile	0m 28s		the patch passed with JDK Ubuntu-21.0.10+7-Ubuntu-124.04
+1 💚	javac	0m 28s		the patch passed
+1 💚	compile	0m 30s		the patch passed with JDK Ubuntu-17.0.18+8-Ubuntu-124.04.1
+1 💚	javac	0m 30s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	0m 27s	/results-checkstyle-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-jobclient.txt	hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient: The patch generated 3 new + 36 unchanged - 2 fixed = 39 total (was 38)
+1 💚	mvnsite	0m 34s		the patch passed
+1 💚	javadoc	0m 23s		the patch passed with JDK Ubuntu-21.0.10+7-Ubuntu-124.04
+1 💚	javadoc	0m 21s		the patch passed with JDK Ubuntu-17.0.18+8-Ubuntu-124.04.1
+1 💚	spotbugs	0m 56s		the patch passed
+1 💚	shadedclient	32m 51s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	113m 11s		hadoop-mapreduce-client-jobclient in the patch passed.
+1 💚	asflicense	0m 45s		The patch does not generate ASF License warnings.
		244m 54s

Subsystem	Report/Notes
Docker	ClientAPI=1.53 ServerAPI=1.53 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8263/1/artifact/out/Dockerfile
GITHUB PR	#8263
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux fad47d7cc158 5.15.0-164-generic #174-Ubuntu SMP Fri Nov 14 20:25:16 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 1df2503
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-8263/1/testReport/
Max. process+thread count	1173 (vs. ulimit of 5500)
modules	C: hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient U: hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8263/1/console
versions	git=2.43.0 maven=3.9.11 spotbugs=4.9.7
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