HDFS-16739. EC: Reconstruction failed when file has specified Storage…

[nauyzz]

…Policy

Description of PR

As mentioned in HDFS-16739, in order to satisfy the storage policy, the length ofchosenTargets may be more than the actual number of blocks that need to be reconstructed. We truncated the chosenTargets array to ensure the reconstruction task could run properly.

How was this patch tested?

It has been running in production for over a year.

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?

AI Tooling

If an AI tool was used:

• The PR includes the phrase "Contains content generated by "
  where is the name of the AI tool used.
• My use of AI contributions follows the ASF legal policy
  https://www.apache.org/legal/generative-tooling.html

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 22s		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 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	26m 28s		trunk passed
+1 💚	compile	0m 53s		trunk passed with JDK Ubuntu-21.0.10+7-Ubuntu-124.04
+1 💚	compile	1m 4s		trunk passed with JDK Ubuntu-17.0.18+8-Ubuntu-124.04.1
+1 💚	checkstyle	1m 5s		trunk passed
+1 💚	mvnsite	1m 7s		trunk passed
+1 💚	javadoc	0m 59s		trunk passed with JDK Ubuntu-21.0.10+7-Ubuntu-124.04
+1 💚	javadoc	0m 56s		trunk passed with JDK Ubuntu-17.0.18+8-Ubuntu-124.04.1
+1 💚	spotbugs	2m 19s		trunk passed
+1 💚	shadedclient	17m 45s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 45s		the patch passed
+1 💚	compile	0m 44s		the patch passed with JDK Ubuntu-21.0.10+7-Ubuntu-124.04
+1 💚	javac	0m 44s		the patch passed
+1 💚	compile	0m 46s		the patch passed with JDK Ubuntu-17.0.18+8-Ubuntu-124.04.1
+1 💚	javac	0m 46s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 42s		the patch passed
+1 💚	mvnsite	0m 46s		the patch passed
+1 💚	javadoc	0m 36s		the patch passed with JDK Ubuntu-21.0.10+7-Ubuntu-124.04
+1 💚	javadoc	0m 38s		the patch passed with JDK Ubuntu-17.0.18+8-Ubuntu-124.04.1
-1 ❌	spotbugs	2m 10s	/new-spotbugs-hadoop-hdfs-project_hadoop-hdfs.html	hadoop-hdfs-project/hadoop-hdfs generated 1 new + 0 unchanged - 0 fixed = 1 total (was 0)
+1 💚	shadedclient	16m 53s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	184m 6s		hadoop-hdfs in the patch passed.
+1 💚	asflicense	0m 31s		The patch does not generate ASF License warnings.
		260m 56s

Reason	Tests
SpotBugs	module:hadoop-hdfs-project/hadoop-hdfs
	Possible null pointer dereference of chosenTargets in org.apache.hadoop.hdfs.server.blockmanagement.ErasureCodingWork.chooseTargets(BlockPlacementPolicy, BlockStoragePolicySuite, Set) Dereferenced at ErasureCodingWork.java:chosenTargets in org.apache.hadoop.hdfs.server.blockmanagement.ErasureCodingWork.chooseTargets(BlockPlacementPolicy, BlockStoragePolicySuite, Set) Dereferenced at ErasureCodingWork.java:[line 78]

Subsystem	Report/Notes
Docker	ClientAPI=1.54 ServerAPI=1.54 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8515/1/artifact/out/Dockerfile
GITHUB PR	#8515
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 19917b3f295c 5.15.0-177-generic #187-Ubuntu SMP Sat Apr 11 22:54:33 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / fddccce
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-8515/1/testReport/
Max. process+thread count	4263 (vs. ulimit of 10000)
modules	C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8515/1/console
versions	git=2.43.0 maven=3.9.15 spotbugs=4.9.7
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