HADOOP-17689. Avoid Potential NPE in org.apache.hadoop.fs

[virajjasani]

No description provided.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 33s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
-1 ❌	test4tests	0m 0s		The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.
			_ trunk Compile Tests _
-1 ❌	mvninstall	33m 52s	/branch-mvninstall-root.txt	root in trunk failed.
+1 💚	compile	20m 57s		trunk passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	compile	18m 7s		trunk passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	checkstyle	1m 5s		trunk passed
+1 💚	mvnsite	1m 32s		trunk passed
+1 💚	javadoc	1m 7s		trunk passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	javadoc	1m 37s		trunk passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	spotbugs	2m 20s		trunk passed
+1 💚	shadedclient	15m 46s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 52s		the patch passed
+1 💚	compile	20m 11s		the patch passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	javac	20m 11s		the patch passed
+1 💚	compile	18m 4s		the patch passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	javac	18m 4s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	1m 3s		the patch passed
+1 💚	mvnsite	1m 31s		the patch passed
+1 💚	javadoc	1m 3s		the patch passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	javadoc	1m 38s		the patch passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	spotbugs	2m 31s		the patch passed
+1 💚	shadedclient	15m 52s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	17m 1s		hadoop-common in the patch passed.
+1 💚	asflicense	0m 55s		The patch does not generate ASF License warnings.
		178m 7s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3008/1/artifact/out/Dockerfile
GITHUB PR	#3008
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell
uname	Linux ebf78dde868b 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/bin/hadoop.sh
git revision	trunk / 2ebe30c
Default Java	Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3008/1/testReport/
Max. process+thread count	3152 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common U: hadoop-common-project/hadoop-common
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3008/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[virajjasani]

QA failure is not relevant.

[tasanuma]

LGTM.

[tasanuma]

Merged it. Thanks for your contribution, @virajjasani!