HADOOP-16774. TestDiskChecker and TestReadWriteDiskValidator fails when run with -Pparallel-tests

[vinayakumarb]

No description provided.

[ayushtkn]

LGTM +1(Pending Jenkins)

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	23m 35s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 1s	No case conflicting files found.
+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.
		_ trunk Compile Tests _
+1 💚	mvninstall	21m 50s	trunk passed
+1 💚	compile	20m 9s	trunk passed
+1 💚	mvnsite	1m 25s	trunk passed
+1 💚	shadedclient	57m 47s	branch has no errors when building and testing our client artifacts.
+1 💚	javadoc	1m 24s	trunk passed
		_ Patch Compile Tests _
+1 💚	mvninstall	0m 50s	the patch passed
+1 💚	compile	16m 39s	the patch passed
+1 💚	javac	16m 39s	the patch passed
+1 💚	mvnsite	1m 22s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	xml	0m 2s	The patch has no ill-formed XML file.
+1 💚	shadedclient	13m 59s	patch has no errors when building and testing our client artifacts.
+1 💚	javadoc	1m 27s	the patch passed
		_ Other Tests _
-1 ❌	unit	9m 41s	hadoop-common in the patch failed.
+1 💚	asflicense	0m 45s	The patch does not generate ASF License warnings.
		130m 28s

Reason	Tests
Failed junit tests	hadoop.ha.TestZKFailoverControllerStress

Subsystem	Report/Notes
Docker	Client=19.03.5 Server=19.03.5 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1776/1/artifact/out/Dockerfile
GITHUB PR	#1776
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient xml
uname	Linux 0666fcacd4b3 4.15.0-66-generic #75-Ubuntu SMP Tue Oct 1 05:24:09 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/hadoop.sh
git revision	trunk / f777cd3
Default Java	1.8.0_232
unit	https://builds.apache.org/job/hadoop-multibranch/job/PR-1776/1/artifact/out/patch-unit-hadoop-common-project_hadoop-common.txt
Test Results	https://builds.apache.org/job/hadoop-multibranch/job/PR-1776/1/testReport/
Max. process+thread count	1378 (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-1776/1/console
versions	git=2.7.4 maven=3.3.9
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[vinayakumarb]

Test failure is unrelated.
This will fix test failures itself, so no need of extra tests.
Thanks @ayushtkn for review.