HADOOP-18271.Remove unused Imports in Hadoop Common project

[ashutoshcipher]

Description of PR

Remove unused Imports in Hadoop Common project

• JIRA: HADOOP-18271

• Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	1m 1s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 1s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 33 new or modified test files.
			_ trunk Compile Tests _
+0 🆗	mvndep	14m 24s		Maven dependency ordering for branch
+1 💚	mvninstall	27m 27s		trunk passed
-1 ❌	compile	4m 15s	/branch-compile-root-jdkPrivateBuild-11.0.15+10-Ubuntu-0ubuntu0.20.04.1.txt	root in trunk failed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1.
-1 ❌	compile	3m 37s	/branch-compile-root-jdkPrivateBuild-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.txt	root in trunk failed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.
+1 💚	checkstyle	1m 22s		trunk passed
+1 💚	mvnsite	3m 35s		trunk passed
+1 💚	javadoc	2m 59s		trunk passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javadoc	2m 24s		trunk passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	spotbugs	5m 13s		trunk passed
+1 💚	shadedclient	23m 1s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 25s		Maven dependency ordering for patch
+1 💚	mvninstall	2m 19s		the patch passed
-1 ❌	compile	4m 4s	/patch-compile-root-jdkPrivateBuild-11.0.15+10-Ubuntu-0ubuntu0.20.04.1.txt	root in the patch failed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1.
-1 ❌	javac	4m 4s	/patch-compile-root-jdkPrivateBuild-11.0.15+10-Ubuntu-0ubuntu0.20.04.1.txt	root in the patch failed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1.
-1 ❌	compile	3m 25s	/patch-compile-root-jdkPrivateBuild-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.txt	root in the patch failed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.
-1 ❌	javac	3m 25s	/patch-compile-root-jdkPrivateBuild-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.txt	root in the patch failed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	1m 6s		hadoop-common-project: The patch generated 0 new + 645 unchanged - 95 fixed = 645 total (was 740)
+1 💚	mvnsite	2m 51s		the patch passed
+1 💚	javadoc	2m 13s		the patch passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javadoc	1m 45s		the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	spotbugs	5m 7s		the patch passed
+1 💚	shadedclient	23m 14s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	3m 35s		hadoop-auth in the patch passed.
+1 💚	unit	17m 46s		hadoop-common in the patch passed.
+1 💚	unit	0m 48s		hadoop-nfs in the patch passed.
+1 💚	unit	1m 13s		hadoop-registry in the patch passed.
+1 💚	asflicense	0m 42s		The patch does not generate ASF License warnings.
		162m 42s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4392/1/artifact/out/Dockerfile
GITHUB PR	#4392
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux aac20b964cc3 4.15.0-175-generic #184-Ubuntu SMP Thu Mar 24 17:48:36 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 3cf2390
Default Java	Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4392/1/testReport/
Max. process+thread count	1951 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-auth hadoop-common-project/hadoop-common hadoop-common-project/hadoop-nfs hadoop-common-project/hadoop-registry U: hadoop-common-project
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4392/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

This message was automatically generated.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	17m 58s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 1s		No case conflicting files found.
+0 🆗	codespell	0m 1s		codespell was not available.
+0 🆗	detsecrets	0m 1s		detect-secrets was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 33 new or modified test files.
			_ trunk Compile Tests _
+0 🆗	mvndep	74m 57s		Maven dependency ordering for branch
+1 💚	mvninstall	27m 6s		trunk passed
+1 💚	compile	25m 2s		trunk passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	compile	21m 39s		trunk passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	checkstyle	1m 41s		trunk passed
+1 💚	mvnsite	4m 55s		trunk passed
+1 💚	javadoc	4m 18s		trunk passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javadoc	3m 48s		trunk passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	spotbugs	6m 31s		trunk passed
+1 💚	shadedclient	24m 15s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 25s		Maven dependency ordering for patch
+1 💚	mvninstall	2m 20s		the patch passed
+1 💚	compile	24m 12s		the patch passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javac	24m 12s		the patch passed
+1 💚	compile	21m 28s		the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	javac	21m 28s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	1m 36s		hadoop-common-project: The patch generated 0 new + 645 unchanged - 95 fixed = 645 total (was 740)
+1 💚	mvnsite	4m 50s		the patch passed
+1 💚	javadoc	4m 12s		the patch passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javadoc	3m 45s		the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	spotbugs	7m 3s		the patch passed
+1 💚	shadedclient	24m 19s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	3m 57s		hadoop-auth in the patch passed.
+1 💚	unit	18m 0s		hadoop-common in the patch passed.
+1 💚	unit	1m 13s		hadoop-nfs in the patch passed.
+1 💚	unit	1m 39s		hadoop-registry in the patch passed.
+1 💚	asflicense	1m 15s		The patch does not generate ASF License warnings.
		336m 52s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4392/2/artifact/out/Dockerfile
GITHUB PR	#4392
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux b538eb0b96bc 4.15.0-175-generic #184-Ubuntu SMP Thu Mar 24 17:48:36 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 3cf2390
Default Java	Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4392/2/testReport/
Max. process+thread count	1252 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-auth hadoop-common-project/hadoop-common hadoop-common-project/hadoop-nfs hadoop-common-project/hadoop-registry U: hadoop-common-project
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4392/2/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

This message was automatically generated.

[PrabhuJoseph]

The patch looks good to me. WIll commit it end of today if no other comments.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	1m 5s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 2s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 33 new or modified test files.
			_ trunk Compile Tests _
+0 🆗	mvndep	15m 3s		Maven dependency ordering for branch
-1 ❌	mvninstall	17m 42s	/branch-mvninstall-root.txt	root in trunk failed.
+1 💚	compile	27m 20s		trunk passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	compile	22m 56s		trunk passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	checkstyle	1m 44s		trunk passed
+1 💚	mvnsite	5m 1s		trunk passed
+1 💚	javadoc	5m 20s		trunk passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javadoc	3m 34s		trunk passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	spotbugs	6m 47s		trunk passed
+1 💚	shadedclient	24m 33s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 30s		Maven dependency ordering for patch
+1 💚	mvninstall	2m 24s		the patch passed
+1 💚	compile	25m 31s		the patch passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javac	25m 31s		the patch passed
+1 💚	compile	22m 52s		the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	javac	22m 52s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	1m 39s		hadoop-common-project: The patch generated 0 new + 645 unchanged - 95 fixed = 645 total (was 740)
+1 💚	mvnsite	4m 52s		the patch passed
+1 💚	javadoc	4m 13s		the patch passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javadoc	3m 44s		the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	spotbugs	7m 29s		the patch passed
+1 💚	shadedclient	25m 43s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	4m 4s		hadoop-auth in the patch passed.
+1 💚	unit	18m 27s		hadoop-common in the patch passed.
+1 💚	unit	1m 13s		hadoop-nfs in the patch passed.
+1 💚	unit	1m 40s		hadoop-registry in the patch passed.
+1 💚	asflicense	1m 15s		The patch does not generate ASF License warnings.
		261m 21s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4392/3/artifact/out/Dockerfile
GITHUB PR	#4392
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux f5a68933472c 4.15.0-175-generic #184-Ubuntu SMP Thu Mar 24 17:48:36 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 3cf2390
Default Java	Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4392/3/testReport/
Max. process+thread count	3135 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-auth hadoop-common-project/hadoop-common hadoop-common-project/hadoop-nfs hadoop-common-project/hadoop-registry U: hadoop-common-project
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4392/3/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

This message was automatically generated.