HDFS-16339. Show the threshold when mover threads quota is exceeded

[tomscut]

JIRA: HDFS-16339.

Show the threshold when mover threads quota is exceeded in DataXceiver#replaceBlock and DataXceiver#copyBlock.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	1m 6s		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 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	33m 15s		trunk passed
+1 💚	compile	1m 26s		trunk passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	compile	1m 20s		trunk passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	checkstyle	0m 58s		trunk passed
+1 💚	mvnsite	1m 27s		trunk passed
+1 💚	javadoc	1m 2s		trunk passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javadoc	1m 33s		trunk passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	spotbugs	3m 22s		trunk passed
+1 💚	shadedclient	22m 54s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 18s		the patch passed
+1 💚	compile	1m 17s		the patch passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javac	1m 17s		the patch passed
+1 💚	compile	1m 13s		the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	javac	1m 13s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 51s		the patch passed
+1 💚	mvnsite	1m 21s		the patch passed
+1 💚	javadoc	0m 51s		the patch passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javadoc	1m 27s		the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	spotbugs	3m 19s		the patch passed
+1 💚	shadedclient	22m 23s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
-1 ❌	unit	397m 58s	/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt	hadoop-hdfs in the patch passed.
+1 💚	asflicense	0m 47s		The patch does not generate ASF License warnings.
		498m 42s

Reason	Tests
Failed junit tests	hadoop.hdfs.web.TestWebHdfsFileSystemContract

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3689/1/artifact/out/Dockerfile
GITHUB PR	#3689
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell
uname	Linux 96ec78fa9fc4 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 / bf3295c
Default Java	Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3689/1/testReport/
Max. process+thread count	2758 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3689/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[virajjasani]

+1 (non-binding), good use of getMaxConcurrentMovers()

[tomscut]

Thanks @virajjasani for your review.

[tomscut]

Hi @tasanuma @ferhui , PTAL. Thanks.

[ferhui]

LGTM

[tasanuma]

Thanks for your contribution, @tomscut. Thanks for your reviews, @virajjasani and @ferhui.

[tomscut]

Thanks @tasanuma for your review and the merge.