HDFS-15906. Close FSImage and FSNamesystem after formatting is complete for branch-3.2

[tomscut]

Close FSImage and FSNamesystem after formatting is complete. For branch-3.2.

[tasanuma]

+1, pending Jenkins.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	9m 26s		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.
			_ branch-3.2 Compile Tests _
+1 💚	mvninstall	27m 22s		branch-3.2 passed
+1 💚	compile	1m 1s		branch-3.2 passed
+1 💚	checkstyle	0m 45s		branch-3.2 passed
+1 💚	mvnsite	1m 9s		branch-3.2 passed
+1 💚	javadoc	1m 0s		branch-3.2 passed
-1 ❌	spotbugs	2m 47s	/branch-spotbugs-hadoop-hdfs-project_hadoop-hdfs-warnings.html	hadoop-hdfs-project/hadoop-hdfs in branch-3.2 has 4 extant spotbugs warnings.
+1 💚	shadedclient	14m 53s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 2s		the patch passed
+1 💚	compile	0m 53s		the patch passed
+1 💚	javac	0m 53s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 37s		the patch passed
+1 💚	mvnsite	1m 0s		the patch passed
+1 💚	javadoc	0m 50s		the patch passed
+1 💚	spotbugs	2m 50s		the patch passed
+1 💚	shadedclient	15m 59s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
-1 ❌	unit	227m 15s	/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt	hadoop-hdfs in the patch failed.
+1 💚	asflicense	0m 40s		The patch does not generate ASF License warnings.
		307m 25s

Reason	Tests
Failed junit tests	hadoop.hdfs.TestDFSStripedOutputStreamWithFailure
	hadoop.hdfs.server.datanode.TestLargeBlockReport
	hadoop.hdfs.TestErasureCodingPolicyWithSnapshot
	hadoop.hdfs.TestEncryptedTransfer
	hadoop.hdfs.TestStateAlignmentContextWithHA
	hadoop.hdfs.server.datanode.TestCachingStrategy
	hadoop.hdfs.TestPread
	hadoop.hdfs.TestFileChecksumCompositeCrc
	hadoop.hdfs.TestDatanodeDeath
	hadoop.hdfs.TestDecommission
	hadoop.hdfs.TestSetrepDecreasing
	hadoop.hdfs.TestReconstructStripedFileWithRandomECPolicy
	hadoop.hdfs.server.blockmanagement.TestUnderReplicatedBlocks
	hadoop.hdfs.server.datanode.TestBatchIbr
	hadoop.hdfs.server.namenode.TestEditLogRace
	hadoop.hdfs.TestErasureCodingPolicies
	hadoop.hdfs.TestAppendSnapshotTruncate
	hadoop.hdfs.TestDistributedFileSystemWithECFile

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2800/1/artifact/out/Dockerfile
GITHUB PR	#2800
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell
uname	Linux 2e6acec7df56 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	branch-3.2 / 4bbc455
Default Java	Private Build-1.8.0_282-8u282-b08-0ubuntu1~18.04-b08
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2800/1/testReport/
Max. process+thread count	3320 (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-2800/1/console
versions	git=2.17.1 maven=3.6.0 spotbugs=4.2.2
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[tasanuma]

The failed tests succeeded in my local environment.
I think the spotbugs warnings are not related. I will file them later.

[tomscut]

Thanks @tasanuma for your test.

[tasanuma]

Merged to branch-3.2 and cherry-picked to branch-3.1. Thanks for your contribution, @tomscut!