HBASE-28598 Fixes NPE for writer object access in AsyncFSWAL#closeWriter

[vineet4008]

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[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	0m 41s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+1 💚	hbaseanti	0m 0s	Patch does not have any anti-patterns.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
		_ branch-2.6 Compile Tests _
+1 💚	mvninstall	3m 21s	branch-2.6 passed
+1 💚	compile	2m 46s	branch-2.6 passed
+1 💚	checkstyle	0m 36s	branch-2.6 passed
+1 💚	spotless	0m 45s	branch has no errors when running spotless:check.
+1 💚	spotbugs	1m 29s	branch-2.6 passed
		_ Patch Compile Tests _
+1 💚	mvninstall	3m 1s	the patch passed
+1 💚	compile	2m 48s	the patch passed
+1 💚	javac	2m 48s	the patch passed
+1 💚	checkstyle	0m 34s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	hadoopcheck	10m 12s	Patch does not cause any errors with Hadoop 2.10.2 or 3.3.6.
+1 💚	spotless	0m 44s	patch has no errors when running spotless:check.
+1 💚	spotbugs	1m 43s	the patch passed
		_ Other Tests _
+1 💚	asflicense	0m 11s	The patch does not generate ASF License warnings.
		30m 21s

Subsystem	Report/Notes
Docker	ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-5907/1/artifact/yetus-general-check/output/Dockerfile
GITHUB PR	#5907
Optional Tests	dupname asflicense javac spotbugs hadoopcheck hbaseanti spotless checkstyle compile
uname	Linux 467afa923944 5.4.0-1103-aws #111~18.04.1-Ubuntu SMP Tue May 23 20:04:10 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	branch-2.6 / 644cf34
Default Java	Eclipse Adoptium-11.0.17+8
Max. process+thread count	77 (vs. ulimit of 30000)
modules	C: hbase-server U: hbase-server
Console output	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-5907/1/console
versions	git=2.34.1 maven=3.8.6 spotbugs=4.7.3
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[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	0m 27s	Docker mode activated.
-0 ⚠️	yetus	0m 5s	Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --whitespace-eol-ignore-list --whitespace-tabs-ignore-list --quick-hadoopcheck
		_ Prechecks _
		_ branch-2.6 Compile Tests _
+1 💚	mvninstall	2m 44s	branch-2.6 passed
+1 💚	compile	0m 43s	branch-2.6 passed
+1 💚	shadedjars	4m 48s	branch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 27s	branch-2.6 passed
		_ Patch Compile Tests _
+1 💚	mvninstall	2m 19s	the patch passed
+1 💚	compile	0m 42s	the patch passed
+1 💚	javac	0m 42s	the patch passed
+1 💚	shadedjars	4m 47s	patch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 24s	the patch passed
		_ Other Tests _
+1 💚	unit	238m 41s	hbase-server in the patch passed.
		260m 43s

Subsystem	Report/Notes
Docker	ClientAPI=1.45 ServerAPI=1.45 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-5907/1/artifact/yetus-jdk8-hadoop2-check/output/Dockerfile
GITHUB PR	#5907
Optional Tests	javac javadoc unit shadedjars compile
uname	Linux 183ca7472272 5.4.0-172-generic #190-Ubuntu SMP Fri Feb 2 23:24:22 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	branch-2.6 / 644cf34
Default Java	Temurin-1.8.0_352-b08
Test Results	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-5907/1/testReport/
Max. process+thread count	4065 (vs. ulimit of 30000)
modules	C: hbase-server U: hbase-server
Console output	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-5907/1/console
versions	git=2.34.1 maven=3.8.6
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[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	0m 43s	Docker mode activated.
-0 ⚠️	yetus	0m 5s	Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --whitespace-eol-ignore-list --whitespace-tabs-ignore-list --quick-hadoopcheck
		_ Prechecks _
		_ branch-2.6 Compile Tests _
+1 💚	mvninstall	3m 0s	branch-2.6 passed
+1 💚	compile	0m 45s	branch-2.6 passed
+1 💚	shadedjars	5m 47s	branch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 24s	branch-2.6 passed
		_ Patch Compile Tests _
+1 💚	mvninstall	2m 44s	the patch passed
+1 💚	compile	0m 44s	the patch passed
+1 💚	javac	0m 44s	the patch passed
+1 💚	shadedjars	5m 43s	patch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 23s	the patch passed
		_ Other Tests _
+1 💚	unit	267m 26s	hbase-server in the patch passed.
		292m 2s

Subsystem	Report/Notes
Docker	ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-5907/1/artifact/yetus-jdk11-hadoop3-check/output/Dockerfile
GITHUB PR	#5907
Optional Tests	javac javadoc unit shadedjars compile
uname	Linux f7205c20dc4c 5.4.0-1103-aws #111~18.04.1-Ubuntu SMP Tue May 23 20:04:10 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	branch-2.6 / 644cf34
Default Java	Eclipse Adoptium-11.0.17+8
Test Results	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-5907/1/testReport/
Max. process+thread count	4286 (vs. ulimit of 30000)
modules	C: hbase-server U: hbase-server
Console output	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-5907/1/console
versions	git=2.34.1 maven=3.8.6
Powered by	Apache Yetus 0.12.0 https://yetus.apache.org

This message was automatically generated.

[vineet4008]

@bbeaudreault @pankaj72981 Please review...