HDFS-16706. ViewFS doc points to wrong mount table name

[Samrat002]

Description of PR

HDFS-16706

How was this patch tested?

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	0m 44s		Docker mode activated.
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+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+0 🆗	markdownlint	0m 0s		markdownlint was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
+1 💚	mvninstall	38m 19s		trunk passed
+1 💚	mvnsite	1m 35s		trunk passed
-1 ❌	shadedclient	41m 32s		branch has errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 21s		the patch passed
+1 💚	blanks	0m 1s		The patch has no blanks issues.
+1 💚	mvnsite	1m 20s		the patch passed
-1 ❌	shadedclient	2m 21s		patch has errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 42s		The patch does not generate ASF License warnings.
		48m 18s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4803/2/artifact/out/Dockerfile
GITHUB PR	#4803
Optional Tests	dupname asflicense mvnsite codespell detsecrets markdownlint
uname	Linux 405912e6721d 4.15.0-191-generic #202-Ubuntu SMP Thu Aug 4 01:49:29 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / f143e86
Max. process+thread count	93 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4803/2/console
versions	git=2.25.1 maven=3.6.3
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[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 57s		Docker mode activated.
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+1 💚	dupname	0m 0s		No case conflicting files found.
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+0 🆗	markdownlint	0m 0s		markdownlint was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
+1 💚	mvninstall	41m 32s		trunk passed
+1 💚	mvnsite	1m 36s		trunk passed
-1 ❌	shadedclient	44m 34s		branch has errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 21s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	1m 23s		the patch passed
-1 ❌	shadedclient	2m 16s		patch has errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 33s		The patch does not generate ASF License warnings.
		51m 33s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4803/1/artifact/out/Dockerfile
GITHUB PR	#4803
Optional Tests	dupname asflicense mvnsite codespell detsecrets markdownlint
uname	Linux 4cc44fdd5f2b 4.15.0-191-generic #202-Ubuntu SMP Thu Aug 4 01:49:29 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / f143e86
Max. process+thread count	83 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4803/1/console
versions	git=2.25.1 maven=3.6.3
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[PrabhuJoseph]

There are few other places needs to be changed.

1. Appendix: A Mount Table Configuration Example

there is a definition of the mount table "ClusterX"

fs.viewfs.mounttable.ClusterX

2. ClusterY's root is merged with the root filesystem

   fs.viewfs.mounttable.ClusterY.linkMergeSlash

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 42s		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.
+0 🆗	markdownlint	0m 0s		markdownlint was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
+1 💚	mvninstall	38m 34s		trunk passed
+1 💚	mvnsite	1m 38s		trunk passed
+1 💚	shadedclient	59m 42s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 18s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	1m 22s		the patch passed
+1 💚	shadedclient	20m 42s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 45s		The patch does not generate ASF License warnings.
		85m 10s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4803/3/artifact/out/Dockerfile
GITHUB PR	#4803
Optional Tests	dupname asflicense mvnsite codespell detsecrets markdownlint
uname	Linux 0da1cf965218 4.15.0-191-generic #202-Ubuntu SMP Thu Aug 4 01:49:29 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 25345fe
Max. process+thread count	648 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4803/3/console
versions	git=2.25.1 maven=3.6.3
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

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[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	19m 7s		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.
+0 🆗	markdownlint	0m 0s		markdownlint was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
+1 💚	mvninstall	41m 20s		trunk passed
+1 💚	mvnsite	1m 40s		trunk passed
+1 💚	shadedclient	65m 44s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 24s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	1m 26s		the patch passed
+1 💚	shadedclient	24m 13s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 40s		The patch does not generate ASF License warnings.
		113m 2s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4803/4/artifact/out/Dockerfile
GITHUB PR	#4803
Optional Tests	dupname asflicense mvnsite codespell detsecrets markdownlint
uname	Linux 73f1be45def7 4.15.0-191-generic #202-Ubuntu SMP Thu Aug 4 01:49:29 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / e40f57d
Max. process+thread count	538 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4803/4/console
versions	git=2.25.1 maven=3.6.3
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

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[Samrat002]

made changes as per comments
please review @PrabhuJoseph

[PrabhuJoseph]

Thanks @Samrat002 for the patch. Latest patch looks good to me, +1. Will commit it if no other comments.