MAPREDUCE-7524 Addressed indeterminism in TestCombineFileInputFormat

[18chanp1]

…by removing assertions based on the internal implementation of HDFS.

Description of PR

org.apache.hadoop.mapreduce.lib.input.TestCombineFileInputFormat.testSplitPlacementForCompressedFiles makes a number of assertions that are not guaranteed by internal implementation.

For example, the test makes assumptions on the order in which racks are processed. Splits in the HDFS can appear in a different order depending on the internal state / implementation / metadata which is not guaranteed by the interface.

For example, there are assertions such as split.equals(splits.get(0)), which assumes a specific ordering of InputSplit objects that may vary depending on internal implementation.

This can be addressed by eliminating assertions based on the internal implementation / ways that the racks are split.

How was this patch tested?

existing tests that pass continue to pass and tests that fail continue to fail. The tests were inspected closely to ensure that the original assertions were followed while maintaining deterministic ordering

For code changes:

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

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	1m 32s		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	36m 36s		trunk passed
+1 💚	compile	0m 40s		trunk passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	compile	0m 39s		trunk passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	checkstyle	0m 34s		trunk passed
+1 💚	mvnsite	0m 44s		trunk passed
+1 💚	javadoc	0m 37s		trunk passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javadoc	0m 33s		trunk passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	spotbugs	0m 58s		trunk passed
+1 💚	shadedclient	25m 25s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 31s		the patch passed
+1 💚	compile	0m 32s		the patch passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javac	0m 32s		the patch passed
+1 💚	compile	0m 32s		the patch passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	javac	0m 32s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	0m 21s	/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 2 new + 57 unchanged - 1 fixed = 59 total (was 58)
+1 💚	mvnsite	0m 33s		the patch passed
+1 💚	javadoc	0m 23s		the patch passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javadoc	0m 23s		the patch passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	spotbugs	0m 55s		the patch passed
+1 💚	shadedclient	25m 41s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	112m 25s		hadoop-mapreduce-client-jobclient in the patch passed.
+1 💚	asflicense	0m 41s		The patch does not generate ASF License warnings.
		213m 57s

Subsystem	Report/Notes
Docker	ClientAPI=1.52 ServerAPI=1.52 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8134/1/artifact/out/Dockerfile
GITHUB PR	#8134
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 3df8f4015170 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 / 7bdf8f9
Default Java	Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
Multi-JDK versions	/usr/lib/jvm/java-21-openjdk-amd64:Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04 /usr/lib/jvm/java-17-openjdk-amd64:Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8134/1/testReport/
Max. process+thread count	1275 (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-8134/1/console
versions	git=2.25.1 maven=3.9.11 spotbugs=4.9.7
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