HADOOP-19622: [3.4 Backport][ABFS][ReadAheadV2] Implement Read Buffer Manager V2 with improved aggressiveness

[anujmodi2021]

Backport PR for following commits in trunk:
1566613
2e9ef96

JIRA: https://issues.apache.org/jira/browse/HADOOP-19650

Description of Original PR

Implementing ReadBufferManagerV2 as per the new design document.
Following capabilities are added to ReadBufferManager:

Configurable minimum and maximum number of prefetch threads.
Configurable minimum and maximum size of cached buffer pool
Dynamically adjusting thread pool size and buffer pool size based on workload requirement and resource utilization but within the limits defined by user.
Mapping prefetched data to file ETag so that multiple streams reading same file can share the cache and save TPS.
For more details on design doc please refer to the design doc attached to parent JIRA: https://issues.apache.org/jira/browse/HADOOP-19596

How was this patch tested?

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	20m 35s		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 10 new or modified test files.
			_ branch-3.4 Compile Tests _
-1 ❌	mvninstall	8m 23s	/branch-mvninstall-root.txt	root in branch-3.4 failed.
-1 ❌	compile	0m 27s	/branch-compile-hadoop-tools_hadoop-azure-jdkUbuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04.txt	hadoop-azure in branch-3.4 failed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04.
-1 ❌	compile	0m 15s	/branch-compile-hadoop-tools_hadoop-azure-jdkPrivateBuild-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09.txt	hadoop-azure in branch-3.4 failed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09.
-0 ⚠️	checkstyle	0m 14s	/buildtool-branch-checkstyle-hadoop-tools_hadoop-azure.txt	The patch fails to run checkstyle in hadoop-azure
-1 ❌	mvnsite	0m 15s	/branch-mvnsite-hadoop-tools_hadoop-azure.txt	hadoop-azure in branch-3.4 failed.
-1 ❌	javadoc	0m 17s	/branch-javadoc-hadoop-tools_hadoop-azure-jdkUbuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04.txt	hadoop-azure in branch-3.4 failed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04.
-1 ❌	javadoc	0m 15s	/branch-javadoc-hadoop-tools_hadoop-azure-jdkPrivateBuild-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09.txt	hadoop-azure in branch-3.4 failed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09.
-1 ❌	spotbugs	0m 14s	/branch-spotbugs-hadoop-tools_hadoop-azure.txt	hadoop-azure in branch-3.4 failed.
-1 ❌	shadedclient	9m 15s		branch has errors when building and testing our client artifacts.
			_ Patch Compile Tests _
-1 ❌	mvninstall	0m 12s	/patch-mvninstall-hadoop-tools_hadoop-azure.txt	hadoop-azure in the patch failed.
-1 ❌	compile	0m 12s	/patch-compile-hadoop-tools_hadoop-azure-jdkUbuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04.txt	hadoop-azure in the patch failed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04.
-1 ❌	javac	0m 12s	/patch-compile-hadoop-tools_hadoop-azure-jdkUbuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04.txt	hadoop-azure in the patch failed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04.
-1 ❌	compile	0m 12s	/patch-compile-hadoop-tools_hadoop-azure-jdkPrivateBuild-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09.txt	hadoop-azure in the patch failed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09.
-1 ❌	javac	0m 12s	/patch-compile-hadoop-tools_hadoop-azure-jdkPrivateBuild-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09.txt	hadoop-azure in the patch failed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09.
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	0m 10s	/buildtool-patch-checkstyle-hadoop-tools_hadoop-azure.txt	The patch fails to run checkstyle in hadoop-azure
-1 ❌	mvnsite	0m 12s	/patch-mvnsite-hadoop-tools_hadoop-azure.txt	hadoop-azure in the patch failed.
-1 ❌	javadoc	0m 12s	/patch-javadoc-hadoop-tools_hadoop-azure-jdkUbuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04.txt	hadoop-azure in the patch failed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04.
-1 ❌	javadoc	0m 13s	/patch-javadoc-hadoop-tools_hadoop-azure-jdkPrivateBuild-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09.txt	hadoop-azure in the patch failed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09.
-1 ❌	spotbugs	0m 12s	/patch-spotbugs-hadoop-tools_hadoop-azure.txt	hadoop-azure in the patch failed.
-1 ❌	shadedclient	9m 55s		patch has errors when building and testing our client artifacts.
			_ Other Tests _
-1 ❌	unit	0m 14s	/patch-unit-hadoop-tools_hadoop-azure.txt	hadoop-azure in the patch failed.
+1 💚	asflicense	0m 34s		The patch does not generate ASF License warnings.
		53m 19s

Subsystem	Report/Notes
Docker	ClientAPI=1.52 ServerAPI=1.52 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8168/1/artifact/out/Dockerfile
GITHUB PR	#8168
JIRA Issue	HADOOP-19622
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 51eb785e4b52 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	branch-3.4 / 7c0afdc
Default Java	Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8168/1/testReport/
Max. process+thread count	63 (vs. ulimit of 5500)
modules	C: hadoop-tools/hadoop-azure U: hadoop-tools/hadoop-azure
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8168/1/console
versions	git=2.25.1 maven=3.6.3
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