HDFS-15623. Respect configured values of rpc.engine

[hchaverri]

NOTICE

Please create an issue in ASF JIRA before opening a pull request,
and you need to set the title of the pull request which starts with
the corresponding JIRA issue number. (e.g. HADOOP-XXXXX. Fix a typo in YYY.)
For more details, please see https://cwiki.apache.org/confluence/display/HADOOP/How+To+Contribute

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	1m 12s		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 💚		0m 0s	test4tests	The patch appears to include 1 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	32m 34s		trunk passed
+1 💚	compile	21m 36s		trunk passed with JDK Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1
+1 💚	compile	18m 13s		trunk passed with JDK Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01
+1 💚	checkstyle	0m 49s		trunk passed
+1 💚	mvnsite	1m 27s		trunk passed
+1 💚	shadedclient	18m 50s		branch has no errors when building and testing our client artifacts.
+1 💚	javadoc	0m 31s		trunk passed with JDK Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1
+1 💚	javadoc	1m 25s		trunk passed with JDK Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01
+0 🆗	spotbugs	2m 19s		Used deprecated FindBugs config; considering switching to SpotBugs.
+1 💚	findbugs	2m 15s		trunk passed
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 52s		the patch passed
+1 💚	compile	21m 38s		the patch passed with JDK Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1
+1 💚	javac	21m 38s		the patch passed
+1 💚	compile	19m 32s		the patch passed with JDK Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01
+1 💚	javac	19m 32s		the patch passed
+1 💚	checkstyle	0m 53s		the patch passed
+1 💚	mvnsite	1m 42s		the patch passed
+1 💚	whitespace	0m 0s		The patch has no whitespace issues.
+1 💚	shadedclient	18m 53s		patch has no errors when building and testing our client artifacts.
+1 💚	javadoc	0m 32s		the patch passed with JDK Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1
+1 💚	javadoc	1m 33s		the patch passed with JDK Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01
+1 💚	findbugs	3m 4s		the patch passed
			_ Other Tests _
+1 💚	unit	11m 25s		hadoop-common in the patch passed.
+1 💚	asflicense	0m 54s		The patch does not generate ASF License warnings.
		182m 5s

Subsystem	Report/Notes
Docker	ClientAPI=1.40 ServerAPI=1.40 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2403/1/artifact/out/Dockerfile
GITHUB PR	#2403
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient findbugs checkstyle
uname	Linux a592174e8dca 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	dev-support/bin/hadoop.sh
git revision	trunk / 7435604
Default Java	Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2403/1/testReport/
Max. process+thread count	1373 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common U: hadoop-common-project/hadoop-common
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2403/1/console
versions	git=2.17.1 maven=3.6.0 findbugs=4.1.3
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[shvachko]

This looks good to me