Update NNStorageRetentionManager.java

[cgkbfrd]

maybe there is a error about the word "checkpoints"

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[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	0m 33s	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 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	19m 41s	trunk passed
+1 💚	compile	1m 7s	trunk passed
+1 💚	checkstyle	0m 46s	trunk passed
+1 💚	mvnsite	1m 11s	trunk passed
+1 💚	shadedclient	15m 24s	branch has no errors when building and testing our client artifacts.
+1 💚	javadoc	0m 43s	trunk passed
+0 🆗	spotbugs	2m 56s	Used deprecated FindBugs config; considering switching to SpotBugs.
+1 💚	findbugs	2m 53s	trunk passed
		_ Patch Compile Tests _
-1 ❌	mvninstall	0m 40s	hadoop-hdfs in the patch failed.
-1 ❌	compile	0m 39s	hadoop-hdfs in the patch failed.
-1 ❌	javac	0m 39s	hadoop-hdfs in the patch failed.
+1 💚	checkstyle	0m 39s	the patch passed
-1 ❌	mvnsite	0m 41s	hadoop-hdfs in the patch failed.
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
-1 ❌	shadedclient	4m 19s	patch has errors when building and testing our client artifacts.
+1 💚	javadoc	0m 41s	the patch passed
-1 ❌	findbugs	0m 40s	hadoop-hdfs in the patch failed.
		_ Other Tests _
-1 ❌	unit	0m 40s	hadoop-hdfs in the patch failed.
+1 💚	asflicense	0m 28s	The patch does not generate ASF License warnings.
		53m 0s

Subsystem	Report/Notes
Docker	ClientAPI=1.40 ServerAPI=1.40 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-2078/1/artifact/out/Dockerfile
GITHUB PR	#2078
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient findbugs checkstyle
uname	Linux 8359a77d1ff3 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	personality/hadoop.sh
git revision	trunk / c8ed33c
Default Java	Private Build-1.8.0_252-8u252-b09-1~18.04-b09
mvninstall	https://builds.apache.org/job/hadoop-multibranch/job/PR-2078/1/artifact/out/patch-mvninstall-hadoop-hdfs-project_hadoop-hdfs.txt
compile	https://builds.apache.org/job/hadoop-multibranch/job/PR-2078/1/artifact/out/patch-compile-hadoop-hdfs-project_hadoop-hdfs.txt
javac	https://builds.apache.org/job/hadoop-multibranch/job/PR-2078/1/artifact/out/patch-compile-hadoop-hdfs-project_hadoop-hdfs.txt
mvnsite	https://builds.apache.org/job/hadoop-multibranch/job/PR-2078/1/artifact/out/patch-mvnsite-hadoop-hdfs-project_hadoop-hdfs.txt
findbugs	https://builds.apache.org/job/hadoop-multibranch/job/PR-2078/1/artifact/out/patch-findbugs-hadoop-hdfs-project_hadoop-hdfs.txt
unit	https://builds.apache.org/job/hadoop-multibranch/job/PR-2078/1/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
Test Results	https://builds.apache.org/job/hadoop-multibranch/job/PR-2078/1/testReport/
Max. process+thread count	414 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs
Console output	https://builds.apache.org/job/hadoop-multibranch/job/PR-2078/1/console
versions	git=2.17.1 maven=3.6.0 findbugs=3.1.0-RC1
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