HADOOP-17202. Fix findbugs warnings in hadoop-tools on branch-2.10.

[iwasakims]

No description provided.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	21m 52s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	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.
		_ branch-2.10 Compile Tests _
+0 🆗	mvndep	2m 23s	Maven dependency ordering for branch
+1 💚	mvninstall	16m 29s	branch-2.10 passed
+1 💚	compile	2m 23s	branch-2.10 passed
+1 💚	checkstyle	0m 42s	branch-2.10 passed
+1 💚	mvnsite	1m 25s	branch-2.10 passed
+1 💚	javadoc	0m 56s	branch-2.10 passed
+0 🆗	spotbugs	1m 9s	Used deprecated FindBugs config; considering switching to SpotBugs.
-1 ❌	findbugs	1m 18s	hadoop-tools/hadoop-azure in branch-2.10 has 1 extant findbugs warnings.
-1 ❌	findbugs	1m 5s	hadoop-tools/hadoop-rumen in branch-2.10 has 1 extant findbugs warnings.
		_ Patch Compile Tests _
+0 🆗	mvndep	0m 28s	Maven dependency ordering for patch
+1 💚	mvninstall	1m 12s	the patch passed
+1 💚	compile	2m 27s	the patch passed
+1 💚	javac	2m 27s	the patch passed
+1 💚	checkstyle	0m 38s	the patch passed
+1 💚	mvnsite	1m 11s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	javadoc	0m 45s	the patch passed
+1 💚	findbugs	1m 12s	hadoop-tools/hadoop-rumen generated 0 new + 0 unchanged - 1 fixed = 0 total (was 1)
+1 💚	findbugs	1m 24s	hadoop-tools/hadoop-azure generated 0 new + 0 unchanged - 1 fixed = 0 total (was 1)
		_ Other Tests _
+1 💚	unit	0m 32s	hadoop-rumen in the patch passed.
+1 💚	unit	1m 18s	hadoop-azure in the patch passed.
+1 💚	asflicense	0m 32s	The patch does not generate ASF License warnings.
		64m 12s

Subsystem	Report/Notes
Docker	ClientAPI=1.40 ServerAPI=1.40 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2214/1/artifact/out/Dockerfile
GITHUB PR	#2214
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient findbugs checkstyle
uname	Linux 41fee7eec366 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/hadoop.sh
git revision	branch-2.10 / 2dffc1d
Default Java	Oracle Corporation-1.7.0_95-b00
findbugs	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2214/1/artifact/out/branch-findbugs-hadoop-tools_hadoop-azure-warnings.html
findbugs	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2214/1/artifact/out/branch-findbugs-hadoop-tools_hadoop-rumen-warnings.html
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2214/1/testReport/
Max. process+thread count	232 (vs. ulimit of 5500)
modules	C: hadoop-tools/hadoop-rumen hadoop-tools/hadoop-azure U: hadoop-tools
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2214/1/console
versions	git=2.7.4 maven=3.3.9 findbugs=3.0.1
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[aajisaka]

LGTM, +1

[iwasakims]

Thanks, @aajisaka. I merged this.