HDFS-14910. Rename Snapshot with Pre Descendants Fail With IllegalArgumentException

[jojochuang]

NOTICE

Please create an issue in ASF JIRA before opening a pull request,
and you need to set the title of the pull request which starts with
the corresponding JIRA issue number. (e.g. HADOOP-XXXXX. Fix a typo in YYY.)
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[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	159	Docker mode activated.
		_ Prechecks _
+1	dupname	0	No case conflicting files found.
+1	@author	0	The patch does not contain any @author tags.
-1	test4tests	0	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	1642	trunk passed
+1	compile	94	trunk passed
+1	checkstyle	61	trunk passed
+1	mvnsite	93	trunk passed
+1	shadedclient	1109	branch has no errors when building and testing our client artifacts.
+1	javadoc	89	trunk passed
0	spotbugs	217	Used deprecated FindBugs config; considering switching to SpotBugs.
+1	findbugs	216	trunk passed
		_ Patch Compile Tests _
+1	mvninstall	87	the patch passed
+1	compile	72	the patch passed
+1	javac	72	the patch passed
+1	checkstyle	48	the patch passed
+1	mvnsite	87	the patch passed
+1	whitespace	0	The patch has no whitespace issues.
+1	shadedclient	1038	patch has no errors when building and testing our client artifacts.
+1	javadoc	91	the patch passed
+1	findbugs	220	the patch passed
		_ Other Tests _
-1	unit	6603	hadoop-hdfs in the patch failed.
+1	asflicense	35	The patch does not generate ASF License warnings.
		11813

Reason	Tests
Failed junit tests	hadoop.hdfs.server.namenode.TestNameNodeMXBean

Subsystem	Report/Notes
Docker	Client=19.03.4 Server=19.03.4 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1672/1/artifact/out/Dockerfile
GITHUB PR	#1672
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient findbugs checkstyle
uname	Linux 38856c08363d 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 / 1d5d7d0
Default Java	1.8.0_222
unit	https://builds.apache.org/job/hadoop-multibranch/job/PR-1672/1/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
Test Results	https://builds.apache.org/job/hadoop-multibranch/job/PR-1672/1/testReport/
Max. process+thread count	2979 (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-1672/1/console
versions	git=2.7.4 maven=3.3.9 findbugs=3.1.0-RC1
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[jojochuang]

Merging the PR based on Ayush's +1 in the JIRA.