HBASE-24368 Let HBCKSCP clear 'Unknown Servers', even if RegionStateN…

[saintstack]

…ode has RegionLocation == null

hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/GCMultipleMergedRegionsProcedure.java
Edit a log.

hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/HBCKServerCrashProcedure.java
Add override of isMatchingRegionLocation. Allow 'null' as a pass in
HBCKSCP.

hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/ServerCrashProcedure.java
Add a method for HBCKSCP to override and be less strict filtering
assigns.

hbase-server/src/main/resources/hbase-webapps/master/hbck.jsp
Some doc on what 'Unknown Servers' are.

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	3m 38s	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 1s	The patch does not contain any @author tags.
		_ branch-2 Compile Tests _
+1 💚	mvninstall	3m 59s	branch-2 passed
+1 💚	checkstyle	1m 15s	branch-2 passed
+1 💚	spotbugs	2m 4s	branch-2 passed
		_ Patch Compile Tests _
+1 💚	mvninstall	3m 38s	the patch passed
-0 ⚠️	checkstyle	1m 16s	hbase-server: The patch generated 1 new + 4 unchanged - 0 fixed = 5 total (was 4)
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	hadoopcheck	12m 49s	Patch does not cause any errors with Hadoop 3.1.2 3.2.1.
+1 💚	spotbugs	2m 16s	the patch passed
		_ Other Tests _
+1 💚	asflicense	0m 14s	The patch does not generate ASF License warnings.
		38m 56s

Subsystem	Report/Notes
Docker	Client=19.03.8 Server=19.03.8 base: https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-1709/1/artifact/yetus-general-check/output/Dockerfile
GITHUB PR	#1709
Optional Tests	dupname asflicense spotbugs hadoopcheck hbaseanti checkstyle
uname	Linux 70dec246a5ac 4.15.0-74-generic #84-Ubuntu SMP Thu Dec 19 08:06:28 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
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versions	git=2.17.1 maven=(cecedd343002696d0abb50b32b541b8a6ba2883f) spotbugs=3.1.12
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[Apache-HBase]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	0m 49s	Docker mode activated.
-0 ⚠️	yetus	0m 6s	Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --whitespace-eol-ignore-list --whitespace-tabs-ignore-list --quick-hadoopcheck
		_ Prechecks _
		_ branch-2 Compile Tests _
+1 💚	mvninstall	4m 30s	branch-2 passed
+1 💚	compile	1m 6s	branch-2 passed
+1 💚	shadedjars	6m 4s	branch has no errors when building our shaded downstream artifacts.
-0 ⚠️	javadoc	0m 41s	hbase-server in branch-2 failed.
		_ Patch Compile Tests _
+1 💚	mvninstall	4m 8s	the patch passed
+1 💚	compile	1m 4s	the patch passed
+1 💚	javac	1m 4s	the patch passed
+1 💚	shadedjars	6m 57s	patch has no errors when building our shaded downstream artifacts.
-0 ⚠️	javadoc	0m 49s	hbase-server in the patch failed.
		_ Other Tests _
-1 ❌	unit	139m 39s	hbase-server in the patch failed.
		167m 50s

Subsystem	Report/Notes
Docker	Client=19.03.8 Server=19.03.8 base: https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-1709/1/artifact/yetus-jdk11-hadoop3-check/output/Dockerfile
GITHUB PR	#1709
Optional Tests	javac javadoc unit shadedjars compile
uname	Linux 20424689c7ac 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	branch-2 / 8d4cb77
Default Java	2020-01-14
javadoc	https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-1709/1/artifact/yetus-jdk11-hadoop3-check/output/branch-javadoc-hbase-server.txt
javadoc	https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-1709/1/artifact/yetus-jdk11-hadoop3-check/output/patch-javadoc-hbase-server.txt
unit	https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-1709/1/artifact/yetus-jdk11-hadoop3-check/output/patch-unit-hbase-server.txt
Test Results	https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-1709/1/testReport/
Max. process+thread count	3575 (vs. ulimit of 12500)
modules	C: hbase-server U: hbase-server
Console output	https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-1709/1/console
versions	git=2.17.1 maven=(cecedd343002696d0abb50b32b541b8a6ba2883f)
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[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	0m 49s	Docker mode activated.
-0 ⚠️	yetus	0m 6s	Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --whitespace-eol-ignore-list --whitespace-tabs-ignore-list --quick-hadoopcheck
		_ Prechecks _
		_ branch-2 Compile Tests _
+1 💚	mvninstall	3m 46s	branch-2 passed
+1 💚	compile	0m 55s	branch-2 passed
+1 💚	shadedjars	5m 2s	branch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 37s	branch-2 passed
		_ Patch Compile Tests _
+1 💚	mvninstall	3m 22s	the patch passed
+1 💚	compile	0m 54s	the patch passed
+1 💚	javac	0m 54s	the patch passed
+1 💚	shadedjars	5m 7s	patch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 36s	the patch passed
		_ Other Tests _
+1 💚	unit	148m 25s	hbase-server in the patch passed.
		171m 49s

Subsystem	Report/Notes
Docker	Client=19.03.8 Server=19.03.8 base: https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-1709/1/artifact/yetus-jdk8-hadoop2-check/output/Dockerfile
GITHUB PR	#1709
Optional Tests	javac javadoc unit shadedjars compile
uname	Linux f0a6a521d597 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	branch-2 / 8d4cb77
Default Java	1.8.0_232
Test Results	https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-1709/1/testReport/
Max. process+thread count	3193 (vs. ulimit of 12500)
modules	C: hbase-server U: hbase-server
Console output	https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-1709/1/console
versions	git=2.17.1 maven=(cecedd343002696d0abb50b32b541b8a6ba2883f)
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[huaxiangsun]

Looks good, +1.

[saintstack]

Merged by hand.