HDFS-16653.Safe mode related operations cannot be performed when “dfs.client.mmap.cache.size” is set to a negative number

[Likkey]

Description of PR

When the configuration item “dfs.client.mmap.cache.size” is set to a negative number, it will cause /hadoop/bin hdfs dfsadmin -safemode provides all the operation options including enter, leave, get, wait and forceExit are invalid, the terminal returns security mode is null and no exceptions are thrown.
HDFS-16653

How was this patch tested?

This patch improves the check mechanism related to “dfs.client.mmap.cache.size”, and give a clear indication when the configuration is abnormal in order to solve the problem in time and reduce the impact on the safe mode related operations.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	1m 28s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 1s		codespell was not available.
+0 🆗	detsecrets	0m 1s		detect-secrets was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 1 new or modified test files.
			_ trunk Compile Tests _
+0 🆗	mvndep	15m 42s		Maven dependency ordering for branch
+1 💚	mvninstall	32m 4s		trunk passed
+1 💚	compile	8m 9s		trunk passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	compile	7m 35s		trunk passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	checkstyle	1m 47s		trunk passed
+1 💚	mvnsite	3m 25s		trunk passed
+1 💚	javadoc	2m 28s		trunk passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javadoc	2m 46s		trunk passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	spotbugs	7m 6s		trunk passed
+1 💚	shadedclient	28m 56s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 29s		Maven dependency ordering for patch
+1 💚	mvninstall	2m 37s		the patch passed
+1 💚	compile	7m 52s		the patch passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javac	7m 52s		the patch passed
+1 💚	compile	7m 12s		the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	javac	7m 12s		the patch passed
-1 ❌	blanks	0m 0s	/blanks-eol.txt	The patch has 1 line(s) that end in blanks. Use git apply --whitespace=fix <<patch_file>>. Refer https://git-scm.com/docs/git-apply
-0 ⚠️	checkstyle	1m 28s	/results-checkstyle-hadoop-hdfs-project.txt	hadoop-hdfs-project: The patch generated 2 new + 13 unchanged - 0 fixed = 15 total (was 13)
+1 💚	mvnsite	2m 51s		the patch passed
+1 💚	javadoc	1m 59s		the patch passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javadoc	2m 28s		the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	spotbugs	7m 1s		the patch passed
+1 💚	shadedclient	29m 47s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	2m 46s		hadoop-hdfs-client in the patch passed.
+1 💚	unit	390m 4s		hadoop-hdfs in the patch passed.
+1 💚	asflicense	1m 1s		The patch does not generate ASF License warnings.
		567m 26s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4707/1/artifact/out/Dockerfile
GITHUB PR	#4707
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 1e40a097b06b 4.15.0-166-generic #174-Ubuntu SMP Wed Dec 8 19:07:44 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 13596ce
Default Java	Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4707/1/testReport/
Max. process+thread count	2074 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs-client hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4707/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 53s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+1 💚	@author	0m 1s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 1 new or modified test files.
			_ trunk Compile Tests _
+0 🆗	mvndep	15m 13s		Maven dependency ordering for branch
+1 💚	mvninstall	28m 10s		trunk passed
+1 💚	compile	6m 50s		trunk passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	compile	6m 31s		trunk passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	checkstyle	1m 34s		trunk passed
+1 💚	mvnsite	2m 48s		trunk passed
+1 💚	javadoc	2m 12s		trunk passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javadoc	2m 35s		trunk passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	spotbugs	6m 34s		trunk passed
+1 💚	shadedclient	26m 3s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 27s		Maven dependency ordering for patch
+1 💚	mvninstall	2m 17s		the patch passed
+1 💚	compile	6m 38s		the patch passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javac	6m 38s		the patch passed
+1 💚	compile	6m 12s		the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	javac	6m 12s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	1m 15s	/results-checkstyle-hadoop-hdfs-project.txt	hadoop-hdfs-project: The patch generated 2 new + 13 unchanged - 0 fixed = 15 total (was 13)
+1 💚	mvnsite	2m 25s		the patch passed
+1 💚	javadoc	1m 41s		the patch passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javadoc	2m 12s		the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	spotbugs	6m 25s		the patch passed
+1 💚	shadedclient	26m 5s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	2m 30s		hadoop-hdfs-client in the patch passed.
+1 💚	unit	361m 55s		hadoop-hdfs in the patch passed.
+1 💚	asflicense	1m 1s		The patch does not generate ASF License warnings.
		518m 20s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4707/2/artifact/out/Dockerfile
GITHUB PR	#4707
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux b535caefe6a5 4.15.0-166-generic #174-Ubuntu SMP Wed Dec 8 19:07:44 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 66a652f
Default Java	Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4707/2/testReport/
Max. process+thread count	2140 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs-client hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4707/2/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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