HADOOP-16705. MBeanInfoBuilder puts unnecessary memory pressure on the system with a debug log

[lukmajercak]

MBeanInfoBuilder's get() method DEBUG logs all the MBeanAttributeInfo attributes that it gathered. This can have a high memory churn that can be easily avoided.

https://issues.apache.org/jira/browse/HADOOP-16705

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	43	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	1221	trunk passed
+1	compile	1152	trunk passed
+1	checkstyle	45	trunk passed
+1	mvnsite	94	trunk passed
+1	shadedclient	943	branch has no errors when building and testing our client artifacts.
+1	javadoc	94	trunk passed
0	spotbugs	136	Used deprecated FindBugs config; considering switching to SpotBugs.
+1	findbugs	134	trunk passed
-0	patch	179	Used diff version of patch file. Binary files and potentially other changes not applied. Please rebase and squash commits if necessary.
		_ Patch Compile Tests _
+1	mvninstall	56	the patch passed
+1	compile	1067	the patch passed
+1	javac	1067	the patch passed
+1	checkstyle	42	the patch passed
+1	mvnsite	83	the patch passed
+1	whitespace	0	The patch has no whitespace issues.
+1	shadedclient	842	patch has no errors when building and testing our client artifacts.
+1	javadoc	89	the patch passed
+1	findbugs	131	the patch passed
		_ Other Tests _
-1	unit	535	hadoop-common in the patch failed.
+1	asflicense	56	The patch does not generate ASF License warnings.
		6732

Reason	Tests
Failed junit tests	hadoop.fs.shell.TestCopyFromLocal

Subsystem	Report/Notes
Docker	Client=19.03.4 Server=19.03.4 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1715/1/artifact/out/Dockerfile
GITHUB PR	#1715
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient findbugs checkstyle
uname	Linux a418d76d6f4c 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 / df6b316
Default Java	1.8.0_222
unit	https://builds.apache.org/job/hadoop-multibranch/job/PR-1715/1/artifact/out/patch-unit-hadoop-common-project_hadoop-common.txt
Test Results	https://builds.apache.org/job/hadoop-multibranch/job/PR-1715/1/testReport/
Max. process+thread count	1393 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common U: hadoop-common-project/hadoop-common
Console output	https://builds.apache.org/job/hadoop-multibranch/job/PR-1715/1/console
versions	git=2.7.4 maven=3.3.9 findbugs=3.1.0-RC1
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