HADOOP-17600. Replace Time.now() with Time.monotonicNow() for measuring time durations

[TJJack]

JIRA ISSUE: https://issues.apache.org/jira/browse/HADOOP-17600

[dineshchitlangia]

+1 pending jenkins

[ayushtkn]

Seems there were some resistance for such a change long back:
https://issues.apache.org/jira/browse/HADOOP-15901?focusedCommentId=16675133&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16675133

Give a check the objections there doesn't hold here

[TJJack]

Hi @ayushtkn , thanks for your information. I think it tolerates small risks on latest versions of OS.
Please refer to https://issues.apache.org/jira/browse/YARN-4177

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	1m 0s		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 2 new or modified test files.
			_ trunk Compile Tests _
+0 🆗	mvndep	13m 56s		Maven dependency ordering for branch
+1 💚	mvninstall	22m 49s		trunk passed
+1 💚	compile	23m 29s		trunk passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	compile	20m 41s		trunk passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	checkstyle	4m 1s		trunk passed
+1 💚	mvnsite	4m 45s		trunk passed
+1 💚	javadoc	3m 52s		trunk passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	javadoc	5m 16s		trunk passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	spotbugs	9m 25s		trunk passed
+1 💚	shadedclient	20m 39s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 27s		Maven dependency ordering for patch
+1 💚	mvninstall	3m 35s		the patch passed
+1 💚	compile	27m 16s		the patch passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	javac	27m 16s		the patch passed
+1 💚	compile	23m 28s		the patch passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	javac	23m 28s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	4m 39s	/results-checkstyle-root.txt	root: The patch generated 4 new + 39 unchanged - 2 fixed = 43 total (was 41)
+1 💚	mvnsite	5m 14s		the patch passed
+1 💚	javadoc	3m 33s		the patch passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	javadoc	5m 29s		the patch passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	spotbugs	11m 5s		the patch passed
+1 💚	shadedclient	20m 9s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	19m 9s		hadoop-common in the patch passed.
-1 ❌	unit	407m 12s	/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt	hadoop-hdfs in the patch passed.
+1 💚	unit	9m 33s		hadoop-hdfs-httpfs in the patch passed.
+1 💚	unit	25m 5s		hadoop-hdfs-rbf in the patch passed.
+1 💚	asflicense	0m 52s		The patch does not generate ASF License warnings.
		699m 18s

Reason	Tests
Failed junit tests	hadoop.hdfs.server.datanode.TestDirectoryScanner
	hadoop.hdfs.TestPersistBlocks
	hadoop.hdfs.server.namenode.snapshot.TestNestedSnapshots
	hadoop.hdfs.server.datanode.TestBlockScanner
	hadoop.hdfs.server.namenode.TestFileTruncate
	hadoop.hdfs.server.namenode.TestProcessCorruptBlocks
	hadoop.hdfs.server.namenode.ha.TestEditLogTailer
	hadoop.hdfs.TestStateAlignmentContextWithHA
	hadoop.hdfs.server.namenode.TestDecommissioningStatusWithBackoffMonitor
	hadoop.hdfs.server.namenode.TestDecommissioningStatus
	hadoop.hdfs.TestDFSShell
	hadoop.hdfs.server.datanode.fsdataset.impl.TestFsVolumeList
	hadoop.hdfs.server.namenode.ha.TestBootstrapStandby
	hadoop.hdfs.TestHDFSFileSystemContract
	hadoop.hdfs.server.datanode.TestIncrementalBrVariations
	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-2810/1/artifact/out/Dockerfile
GITHUB PR	#2810
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell
uname	Linux 08b0c4309306 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 / a95642f
Default Java	Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2810/1/testReport/
Max. process+thread count	2387 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common hadoop-hdfs-project/hadoop-hdfs hadoop-hdfs-project/hadoop-hdfs-httpfs hadoop-hdfs-project/hadoop-hdfs-rbf U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2810/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[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.

[TJJack]

感谢您的来信，邮件已收到！我会尽快查看！                                                       ----姜佳君