HADOOP-19655: Add a RISC-V Zbc (CLMUL) hardware-accelerated path for CRC32/CRC32C in hadoop-common native.

[PeterPtroc]

Description of PR

• Implements a CLMUL-based 16B fold + Barrett reduction algorithm, adapted from riscv-crc32-clmul.
• True interleaved (round-robin) multi-block pipeline (1–3 blocks) to increase ILP.
• Small buffers and tails fall back to the existing table-based software path.
• Runtime gating:
  • Double-checked detection: “zbc” in /proc/cpuinfo AND a SIGILL-safe CLMUL probe.

How was this patch tested?

• Build (native profile):
  • mvn -pl hadoop-common-project/hadoop-common -am -Pnative -DskipTests clean install
• Run benchmark:
  • mvn -Pnative -DskipTests -Dexec.classpathScope=test -Dexec.mainClass=org.apache.hadoop.util.Crc32PerformanceTest

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	27m 44s		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	44m 27s		trunk passed
+1 💚	compile	18m 7s		trunk passed
-1 ❌	mvnsite	1m 45s	/branch-mvnsite-hadoop-common-project_hadoop-common.txt	hadoop-common in trunk failed.
+1 💚	shadedclient	105m 59s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 10s		the patch passed
+1 💚	compile	16m 23s		the patch passed
+1 💚	cc	16m 23s		the patch passed
+1 💚	golang	16m 23s		the patch passed
+1 💚	javac	16m 23s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-1 ❌	mvnsite	1m 47s	/patch-mvnsite-hadoop-common-project_hadoop-common.txt	hadoop-common in the patch failed.
+1 💚	shadedclient	43m 12s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	24m 53s		hadoop-common in the patch passed.
+1 💚	asflicense	1m 47s		The patch does not generate ASF License warnings.
		223m 28s

Subsystem	Report/Notes
Docker	ClientAPI=1.51 ServerAPI=1.51 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7896/2/artifact/out/Dockerfile
GITHUB PR	#7896
Optional Tests	dupname asflicense compile cc mvnsite javac unit codespell detsecrets golang
uname	Linux 4727479d09e6 5.15.0-144-generic #157-Ubuntu SMP Mon Jun 16 07:33:10 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 58baa6e
Default Java	Red Hat, Inc.-1.8.0_312-b07
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7896/2/testReport/
Max. process+thread count	3133 (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-7896/2/console
versions	git=2.27.0 maven=3.6.3
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[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	29m 24s		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	46m 46s		trunk passed
+1 💚	compile	17m 41s		trunk passed
-1 ❌	mvnsite	1m 45s	/branch-mvnsite-hadoop-common-project_hadoop-common.txt	hadoop-common in trunk failed.
+1 💚	shadedclient	107m 55s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 12s		the patch passed
+1 💚	compile	16m 38s		the patch passed
+1 💚	cc	16m 38s		the patch passed
+1 💚	golang	16m 38s		the patch passed
+1 💚	javac	16m 38s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-1 ❌	mvnsite	1m 43s	/patch-mvnsite-hadoop-common-project_hadoop-common.txt	hadoop-common in the patch failed.
+1 💚	shadedclient	42m 59s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	24m 53s		hadoop-common in the patch passed.
+1 💚	asflicense	1m 54s		The patch does not generate ASF License warnings.
		227m 14s

Subsystem	Report/Notes
Docker	ClientAPI=1.51 ServerAPI=1.51 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7896/1/artifact/out/Dockerfile
GITHUB PR	#7896
Optional Tests	dupname asflicense compile cc mvnsite javac unit codespell detsecrets golang
uname	Linux 262a84b27cca 5.15.0-144-generic #157-Ubuntu SMP Mon Jun 16 07:33:10 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 58baa6e
Default Java	Red Hat, Inc.-1.8.0_312-b07
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7896/1/testReport/
Max. process+thread count	3133 (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-7896/1/console
versions	git=2.27.0 maven=3.6.3
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

This message was automatically generated.