Backport "HBASE-26765 Minor refactor of async scanning code (#4121)" to branch-2.5

[ndimiduk]

Signed-off-by: Duo Zhang [email protected]

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	0m 56s	Docker mode activated.
-0 ⚠️	yetus	0m 5s	Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --whitespace-eol-ignore-list --whitespace-tabs-ignore-list --quick-hadoopcheck
		_ Prechecks _
		_ branch-2.5 Compile Tests _
+1 💚	mvninstall	2m 53s	branch-2.5 passed
+1 💚	compile	0m 17s	branch-2.5 passed
+1 💚	shadedjars	3m 56s	branch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 16s	branch-2.5 passed
		_ Patch Compile Tests _
+1 💚	mvninstall	2m 14s	the patch passed
+1 💚	compile	0m 16s	the patch passed
+1 💚	javac	0m 16s	the patch passed
+1 💚	shadedjars	3m 55s	patch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 14s	the patch passed
		_ Other Tests _
+1 💚	unit	3m 12s	hbase-client in the patch passed.
		19m 17s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4135/1/artifact/yetus-jdk8-hadoop2-check/output/Dockerfile
GITHUB PR	#4135
Optional Tests	javac javadoc unit shadedjars compile
uname	Linux af585a3845dc 5.4.0-1025-aws #25~18.04.1-Ubuntu SMP Fri Sep 11 12:03:04 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	branch-2.5 / d13cc38
Default Java	AdoptOpenJDK-1.8.0_282-b08
Test Results	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4135/1/testReport/
Max. process+thread count	140 (vs. ulimit of 12500)
modules	C: hbase-client U: hbase-client
Console output	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4135/1/console
versions	git=2.17.1 maven=3.6.3
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[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	2m 30s	Docker mode activated.
-0 ⚠️	yetus	0m 4s	Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --whitespace-eol-ignore-list --whitespace-tabs-ignore-list --quick-hadoopcheck
		_ Prechecks _
		_ branch-2.5 Compile Tests _
+1 💚	mvninstall	3m 5s	branch-2.5 passed
+1 💚	compile	0m 21s	branch-2.5 passed
+1 💚	shadedjars	4m 11s	branch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 20s	branch-2.5 passed
		_ Patch Compile Tests _
+1 💚	mvninstall	2m 46s	the patch passed
+1 💚	compile	0m 22s	the patch passed
+1 💚	javac	0m 22s	the patch passed
+1 💚	shadedjars	4m 5s	patch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 18s	the patch passed
		_ Other Tests _
+1 💚	unit	3m 25s	hbase-client in the patch passed.
		22m 32s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4135/1/artifact/yetus-jdk11-hadoop3-check/output/Dockerfile
GITHUB PR	#4135
Optional Tests	javac javadoc unit shadedjars compile
uname	Linux 400748386d8f 5.4.0-90-generic #101-Ubuntu SMP Fri Oct 15 20:00:55 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	branch-2.5 / d13cc38
Default Java	AdoptOpenJDK-11.0.10+9
Test Results	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4135/1/testReport/
Max. process+thread count	158 (vs. ulimit of 12500)
modules	C: hbase-client U: hbase-client
Console output	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4135/1/console
versions	git=2.17.1 maven=3.6.3
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[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	0m 54s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+1 💚	hbaseanti	0m 0s	Patch does not have any anti-patterns.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
		_ branch-2.5 Compile Tests _
+1 💚	mvninstall	2m 52s	branch-2.5 passed
+1 💚	compile	0m 37s	branch-2.5 passed
+1 💚	checkstyle	0m 19s	branch-2.5 passed
+1 💚	spotbugs	0m 44s	branch-2.5 passed
		_ Patch Compile Tests _
+1 💚	mvninstall	2m 13s	the patch passed
+1 💚	compile	0m 36s	the patch passed
+1 💚	javac	0m 36s	the patch passed
+1 💚	checkstyle	0m 17s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	hadoopcheck	11m 4s	Patch does not cause any errors with Hadoop 2.10.0 or 3.1.2 3.2.1.
+1 💚	spotbugs	0m 48s	the patch passed
		_ Other Tests _
+1 💚	asflicense	0m 8s	The patch does not generate ASF License warnings.
		25m 42s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4135/1/artifact/yetus-general-check/output/Dockerfile
GITHUB PR	#4135
Optional Tests	dupname asflicense javac spotbugs hadoopcheck hbaseanti checkstyle compile
uname	Linux 0b38cb55ac14 5.4.0-1047-aws #49~18.04.1-Ubuntu SMP Wed Apr 28 23:08:58 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	branch-2.5 / d13cc38
Default Java	AdoptOpenJDK-1.8.0_282-b08
Max. process+thread count	60 (vs. ulimit of 12500)
modules	C: hbase-client U: hbase-client
Console output	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4135/1/console
versions	git=2.17.1 maven=3.6.3 spotbugs=4.2.2
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