HADOOP-17028. ViewFS should initialize mounted target filesystems lazily

[abhishekdas99]

…. Contributed by Abhishek Das (#2929

(cherry picked from commit 1dd03cc)

https://issues.apache.org/jira/browse/HADOOP-17028

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[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	0m 46s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s	The patch appears to include 4 new or modified test files.
		_ branch-2.10 Compile Tests _
+0 🆗	mvndep	2m 9s	Maven dependency ordering for branch
+1 💚	mvninstall	12m 10s	branch-2.10 passed
+1 💚	compile	13m 13s	branch-2.10 passed with JDK Azul Systems, Inc.-1.7.0_262-b10
+1 💚	compile	10m 44s	branch-2.10 passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~16.04.1-b10
+1 💚	checkstyle	2m 1s	branch-2.10 passed
+1 💚	mvnsite	2m 30s	branch-2.10 passed
+1 💚	javadoc	2m 42s	branch-2.10 passed with JDK Azul Systems, Inc.-1.7.0_262-b10
+1 💚	javadoc	2m 7s	branch-2.10 passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~16.04.1-b10
+0 🆗	spotbugs	15m 8s	Both FindBugs and SpotBugs are enabled, using SpotBugs.
-1 ❌	spotbugs	2m 3s	hadoop-common-project/hadoop-common in branch-2.10 has 2 extant spotbugs warnings.
-1 ❌	spotbugs	2m 30s	hadoop-hdfs-project/hadoop-hdfs in branch-2.10 has 1 extant spotbugs warnings.
		_ Patch Compile Tests _
+0 🆗	mvndep	0m 21s	Maven dependency ordering for patch
+1 💚	mvninstall	1m 36s	the patch passed
+1 💚	compile	12m 31s	the patch passed with JDK Azul Systems, Inc.-1.7.0_262-b10
+1 💚	javac	12m 31s	the patch passed
+1 💚	compile	10m 41s	the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~16.04.1-b10
+1 💚	javac	10m 41s	the patch passed
+1 💚	checkstyle	1m 56s	root: The patch generated 0 new + 218 unchanged - 6 fixed = 218 total (was 224)
+1 💚	mvnsite	2m 28s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	javadoc	2m 36s	the patch passed with JDK Azul Systems, Inc.-1.7.0_262-b10
+1 💚	javadoc	2m 1s	the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~16.04.1-b10
+1 💚	spotbugs	4m 58s	the patch passed
		_ Other Tests _
-1 ❌	unit	8m 10s	hadoop-common in the patch failed.
-1 ❌	unit	62m 53s	hadoop-hdfs in the patch failed.
+1 💚	asflicense	0m 56s	The patch does not generate ASF License warnings.
		171m 25s

Reason	Tests
Failed junit tests	hadoop.log.TestLogLevel
	hadoop.hdfs.qjournal.server.TestJournalNodeRespectsBindHostKeys

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3218/1/artifact/out/Dockerfile
GITHUB PR	#3218
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle
uname	Linux e82c3bca9d52 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/bin/hadoop.sh
git revision	branch-2.10 / 39c8297
Default Java	Private Build-1.8.0_292-8u292-b10-0ubuntu1~16.04.1-b10
Multi-JDK versions	/usr/lib/jvm/zulu-7-amd64:Azul Systems, Inc.-1.7.0_262-b10 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_292-8u292-b10-0ubuntu1~16.04.1-b10
spotbugs	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3218/1/artifact/out/branch-spotbugs-hadoop-common-project_hadoop-common-warnings.html
spotbugs	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3218/1/artifact/out/branch-spotbugs-hadoop-hdfs-project_hadoop-hdfs-warnings.html
unit	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3218/1/artifact/out/patch-unit-hadoop-common-project_hadoop-common.txt
unit	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3218/1/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3218/1/testReport/
Max. process+thread count	2620 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common hadoop-hdfs-project/hadoop-hdfs U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3218/1/console
versions	git=2.7.4 maven=3.3.9 spotbugs=4.2.2
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[shvachko]

+1 on branch-2.10 patch