HADOOP-17837: Add unresolved endpoint value to UnknownHostException (ADDENDUM)

[bbeaudreault]

Addresses a comment made in #3272.

The other comment about concatenating the UnresolvedAddressException message is unnecessary. In all versions of java it's impossible to add a message to an UnresolvedAddressException. See java11, there is only a no-args constructor and no setMessage() method.

[brahmareddybattula]

+1

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	1m 15s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 1s		codespell 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 _
+1 💚	mvninstall	31m 29s		trunk passed
+1 💚	compile	21m 28s		trunk passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	compile	18m 32s		trunk passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	checkstyle	1m 5s		trunk passed
+1 💚	mvnsite	1m 37s		trunk passed
+1 💚	javadoc	1m 8s		trunk passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javadoc	1m 40s		trunk passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	spotbugs	2m 25s		trunk passed
+1 💚	shadedclient	15m 48s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 56s		the patch passed
+1 💚	compile	20m 38s		the patch passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javac	20m 38s		the patch passed
+1 💚	compile	18m 37s		the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	javac	18m 37s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	1m 4s		the patch passed
+1 💚	mvnsite	1m 35s		the patch passed
+1 💚	javadoc	1m 6s		the patch passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javadoc	1m 42s		the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	spotbugs	2m 35s		the patch passed
+1 💚	shadedclient	15m 59s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	17m 12s		hadoop-common in the patch passed.
+1 💚	asflicense	0m 59s		The patch does not generate ASF License warnings.
		179m 27s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3276/1/artifact/out/Dockerfile
GITHUB PR	#3276
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell
uname	Linux c2c6c97e1c21 4.15.0-65-generic #74-Ubuntu SMP Tue Sep 17 17:06:04 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / a3a87e4
Default Java	Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
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Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3276/1/testReport/
Max. process+thread count	1267 (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-3276/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[steveloughran]

thx. Pity about the Exception constructor.