HADOOP-18241. Move to JAVA 11.

[ayushtkn]

WIP

[hadoop-yetus]

(!) A patch to the testing environment has been detected.
Re-executing against the patched versions to perform further tests.
The console is at https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4319/1/console in case of problems.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	41m 18s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 1s		No case conflicting files found.
+0 🆗	codespell	0m 1s		codespell was not available.
+0 🆗	hadolint	0m 1s		hadolint was not available.
+0 🆗	shellcheck	0m 1s		Shellcheck was not available.
+0 🆗	shelldocs	0m 1s		Shelldocs was not available.
+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 _
+0 🆗	mvndep	15m 35s		Maven dependency ordering for branch
+1 💚	mvninstall	25m 49s		trunk passed
+1 💚	compile	21m 12s		trunk passed
+1 💚	mvnsite	19m 37s		trunk passed
+1 💚	javadoc	8m 55s		trunk passed
+1 💚	shadedclient	110m 20s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 51s		Maven dependency ordering for patch
-1 ❌	mvninstall	0m 22s	/patch-mvninstall-hadoop-project.txt	hadoop-project in the patch failed.
-1 ❌	mvninstall	0m 21s	/patch-mvninstall-hadoop-common-project_hadoop-annotations.txt	hadoop-annotations in the patch failed.
-1 ❌	mvninstall	0m 22s	/patch-mvninstall-root.txt	root in the patch failed.
-1 ❌	compile	0m 22s	/patch-compile-root.txt	root in the patch failed.
-1 ❌	javac	0m 22s	/patch-compile-root.txt	root in the patch failed.
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-1 ❌	mvnsite	0m 22s	/patch-mvnsite-root.txt	root in the patch failed.
+1 💚	xml	0m 4s		The patch has no ill-formed XML file.
-1 ❌	javadoc	0m 20s	/patch-javadoc-root.txt	root in the patch failed.
-1 ❌	shadedclient	1m 42s		patch has errors when building and testing our client artifacts.
			_ Other Tests _
-1 ❌	unit	0m 21s	/patch-unit-root.txt	root in the patch failed.
+1 💚	asflicense	0m 38s		The patch does not generate ASF License warnings.
		159m 3s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4319/1/artifact/out/Dockerfile
GITHUB PR	#4319
Optional Tests	dupname asflicense codespell hadolint shellcheck shelldocs mvnsite unit compile javac javadoc mvninstall shadedclient xml
uname	Linux 956309d80e28 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 / 14a2be9a8eebfa2eef67d48ebd5f327ec8bb6e89
Default Java	Red Hat, Inc.-1.8.0_332-b09
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4319/1/testReport/
Max. process+thread count	724 (vs. ulimit of 5500)
modules	C: hadoop-project hadoop-common-project/hadoop-annotations . U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4319/1/console
versions	git=2.9.5 maven=3.6.3
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[hadoop-yetus]

(!) A patch to the testing environment has been detected.
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[hadoop-yetus]

(!) A patch to the testing environment has been detected.
Re-executing against the patched versions to perform further tests.
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[hadoop-yetus]

(!) A patch to the testing environment has been detected.
Re-executing against the patched versions to perform further tests.
The console is at https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4319/5/console in case of problems.

[hadoop-yetus]

(!) A patch to the testing environment has been detected.
Re-executing against the patched versions to perform further tests.
The console is at https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4319/6/console in case of problems.

[ayushtkn]

Gonna have test failures. We need HADOOP-15984
realised we don’t fully support java-11 as of now, it still has some work remaining.

[slfan1989]

Hi, @ayushtkn I hope to provide some help, I see that during the compilation process of the code I submitted, there is a java doc compilation warning in JDK11, I will fix it.

[ayushtkn]

@slfan1989 Javadoc errors most of them I sorted, you can try get hold of this if you have time
HADOOP-15984

[slfan1989]

@ayushtkn I will continue to follow up on HADOOP-15984.

It has been found that there are many java doc compilation problems involving HDFS modules, as follows:
https://github.com/apache/hadoop/pull/4406、https://github.com/apache/hadoop/pull/4419

First of all I will still finish this pr(#4423).

[github-actions]

We're closing this stale PR because it has been open for 100 days with no activity. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable.
If you feel like this was a mistake, or you would like to continue working on it, please feel free to re-open it and ask for a committer to remove the stale tag and review again.
Thanks all for your contribution.