HDFS-15819. Fix import style

[maobaolong]

https://issues.apache.org/jira/browse/HDFS-15819

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	1m 9s		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 💚		0m 0s	test4tests	The patch appears to include 1 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	32m 22s		trunk passed
+1 💚	compile	1m 20s		trunk passed with JDK Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.20.04
+1 💚	compile	1m 15s		trunk passed with JDK Private Build-1.8.0_275-8u275-b01-0ubuntu1~20.04-b01
+1 💚	checkstyle	0m 59s		trunk passed
+1 💚	mvnsite	1m 21s		trunk passed
+1 💚	shadedclient	15m 28s		branch has no errors when building and testing our client artifacts.
+1 💚	javadoc	0m 56s		trunk passed with JDK Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.20.04
+1 💚	javadoc	1m 29s		trunk passed with JDK Private Build-1.8.0_275-8u275-b01-0ubuntu1~20.04-b01
+0 🆗	spotbugs	3m 6s		Used deprecated FindBugs config; considering switching to SpotBugs.
+1 💚	findbugs	3m 4s		trunk passed
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 10s		the patch passed
+1 💚	compile	1m 15s		the patch passed with JDK Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.20.04
+1 💚	javac	1m 15s		the patch passed
+1 💚	compile	1m 5s		the patch passed with JDK Private Build-1.8.0_275-8u275-b01-0ubuntu1~20.04-b01
+1 💚	javac	1m 5s		the patch passed
+1 💚	checkstyle	0m 52s		the patch passed
+1 💚	mvnsite	1m 13s		the patch passed
+1 💚	whitespace	0m 0s		The patch has no whitespace issues.
+1 💚	shadedclient	12m 36s		patch has no errors when building and testing our client artifacts.
+1 💚	javadoc	0m 47s		the patch passed with JDK Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.20.04
+1 💚	javadoc	1m 22s		the patch passed with JDK Private Build-1.8.0_275-8u275-b01-0ubuntu1~20.04-b01
+1 💚	findbugs	3m 8s		the patch passed
			_ Other Tests _
-1 ❌	unit	227m 44s	/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt	hadoop-hdfs in the patch passed.
+1 💚	asflicense	0m 45s		The patch does not generate ASF License warnings.
		313m 9s

Reason	Tests
Failed junit tests	hadoop.hdfs.server.datanode.TestDataNodeUUID

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2681/1/artifact/out/Dockerfile
GITHUB PR	#2681
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient findbugs checkstyle
uname	Linux c6784034c641 4.15.0-65-generic #74-Ubuntu SMP Tue Sep 17 17:06:04 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 15a1f7a
Default Java	Private Build-1.8.0_275-8u275-b01-0ubuntu1~20.04-b01
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.9.1+1-Ubuntu-0ubuntu1.20.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_275-8u275-b01-0ubuntu1~20.04-b01
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2681/1/testReport/
Max. process+thread count	3062 (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-2681/1/console
versions	git=2.25.1 maven=3.6.3 findbugs=4.0.6
Powered by	Apache Yetus 0.13.0-SNAPSHOT https://yetus.apache.org

This message was automatically generated.

[ferhui]

+1

[ferhui]

@maobaolong Thanks for fix, merged

[maobaolong]

@ferhui Thanks very mush for merge this PR.