HBASE-25528: Dedicated merge dispatch threadpool on master

[bharathv]

Adds "hbase.master.executor.merge.dispatch.threads" and defaults to 2.

Also adds additional logging that includes the number of split plans
and merge plans computed for each normalizer run.

(cherry picked from commit 36b4698)

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	1m 31s	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 Compile Tests _
+0 🆗	mvndep	0m 17s	Maven dependency ordering for branch
+1 💚	mvninstall	4m 1s	branch-2 passed
+1 💚	compile	4m 18s	branch-2 passed
+1 💚	checkstyle	1m 46s	branch-2 passed
+1 💚	spotbugs	2m 58s	branch-2 passed
		_ Patch Compile Tests _
+0 🆗	mvndep	0m 12s	Maven dependency ordering for patch
+1 💚	mvninstall	3m 26s	the patch passed
+1 💚	compile	4m 22s	the patch passed
+1 💚	javac	4m 22s	the patch passed
-0 ⚠️	checkstyle	1m 17s	hbase-server: The patch generated 2 new + 149 unchanged - 1 fixed = 151 total (was 150)
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	hadoopcheck	13m 39s	Patch does not cause any errors with Hadoop 3.1.2 3.2.1.
+1 💚	spotbugs	3m 17s	the patch passed
		_ Other Tests _
+1 💚	asflicense	0m 26s	The patch does not generate ASF License warnings.
		50m 38s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2910/1/artifact/yetus-general-check/output/Dockerfile
GITHUB PR	#2910
JIRA Issue	HBASE-25528
Optional Tests	dupname asflicense javac spotbugs hadoopcheck hbaseanti checkstyle compile
uname	Linux 8b731bf65a05 4.15.0-65-generic #74-Ubuntu SMP Tue Sep 17 17:06:04 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	branch-2 / 818000d
Default Java	AdoptOpenJDK-1.8.0_232-b09
checkstyle	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2910/1/artifact/yetus-general-check/output/diff-checkstyle-hbase-server.txt
Max. process+thread count	96 (vs. ulimit of 12500)
modules	C: hbase-common hbase-server U: .
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2910/1/console
versions	git=2.17.1 maven=3.6.3 spotbugs=3.1.12
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[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	0m 39s	Docker mode activated.
-0 ⚠️	yetus	0m 8s	Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --whitespace-eol-ignore-list --whitespace-tabs-ignore-list --quick-hadoopcheck
		_ Prechecks _
		_ branch-2 Compile Tests _
+0 🆗	mvndep	0m 16s	Maven dependency ordering for branch
+1 💚	mvninstall	4m 13s	branch-2 passed
+1 💚	compile	1m 33s	branch-2 passed
+1 💚	shadedjars	6m 41s	branch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	1m 5s	branch-2 passed
		_ Patch Compile Tests _
+0 🆗	mvndep	0m 21s	Maven dependency ordering for patch
+1 💚	mvninstall	3m 59s	the patch passed
+1 💚	compile	1m 30s	the patch passed
+1 💚	javac	1m 30s	the patch passed
+1 💚	shadedjars	6m 47s	patch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	1m 5s	the patch passed
		_ Other Tests _
+1 💚	unit	1m 38s	hbase-common in the patch passed.
+1 💚	unit	130m 43s	hbase-server in the patch passed.
		163m 10s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2910/1/artifact/yetus-jdk11-hadoop3-check/output/Dockerfile
GITHUB PR	#2910
JIRA Issue	HBASE-25528
Optional Tests	javac javadoc unit shadedjars compile
uname	Linux d03208fbcec0 4.15.0-60-generic #67-Ubuntu SMP Thu Aug 22 16:55:30 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	branch-2 / 818000d
Default Java	AdoptOpenJDK-11.0.6+10
Test Results	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2910/1/testReport/
Max. process+thread count	3877 (vs. ulimit of 12500)
modules	C: hbase-common hbase-server U: .
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2910/1/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 3s	Docker mode activated.
-0 ⚠️	yetus	0m 8s	Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --whitespace-eol-ignore-list --whitespace-tabs-ignore-list --quick-hadoopcheck
		_ Prechecks _
		_ branch-2 Compile Tests _
+0 🆗	mvndep	0m 17s	Maven dependency ordering for branch
+1 💚	mvninstall	4m 43s	branch-2 passed
+1 💚	compile	1m 42s	branch-2 passed
+1 💚	shadedjars	8m 19s	branch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	1m 14s	branch-2 passed
		_ Patch Compile Tests _
+0 🆗	mvndep	0m 17s	Maven dependency ordering for patch
+1 💚	mvninstall	4m 19s	the patch passed
+1 💚	compile	1m 40s	the patch passed
+1 💚	javac	1m 40s	the patch passed
+1 💚	shadedjars	7m 51s	patch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	1m 16s	the patch passed
		_ Other Tests _
+1 💚	unit	2m 5s	hbase-common in the patch passed.
+1 💚	unit	226m 13s	hbase-server in the patch passed.
		264m 25s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2910/1/artifact/yetus-jdk8-hadoop2-check/output/Dockerfile
GITHUB PR	#2910
JIRA Issue	HBASE-25528
Optional Tests	javac javadoc unit shadedjars compile
uname	Linux e6858f683c4e 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	branch-2 / 818000d
Default Java	AdoptOpenJDK-1.8.0_232-b09
Test Results	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2910/1/testReport/
Max. process+thread count	2607 (vs. ulimit of 12500)
modules	C: hbase-common hbase-server U: .
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2910/1/console
versions	git=2.17.1 maven=3.6.3
Powered by	Apache Yetus 0.12.0 https://yetus.apache.org

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