HDFS-14738：Reading and writing HDFS data through HDFS nfs3 server often getting stuck

[alexkingli]

If the user group does not exist, there will be a lot of invoking the updateMapIncr . And it is the synchronized methods，it really affects performance.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	45	Docker mode activated.
		_ Prechecks _
+1	dupname	0	No case conflicting files found.
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-1	test4tests	0	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	1066	trunk passed
+1	compile	1070	trunk passed
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0	spotbugs	123	Used deprecated FindBugs config; considering switching to SpotBugs.
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		_ Patch Compile Tests _
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+1	javadoc	63	the patch passed
+1	findbugs	134	the patch passed
		_ Other Tests _
-1	unit	507	hadoop-common in the patch failed.
+1	asflicense	40	The patch does not generate ASF License warnings.
		6024

Reason	Tests
Failed junit tests	hadoop.security.TestShellBasedIdMapping

Subsystem	Report/Notes
Docker	Client=19.03.1 Server=19.03.1 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1300/1/artifact/out/Dockerfile
GITHUB PR	#1300
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient findbugs checkstyle
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versions	git=2.7.4 maven=3.3.9 findbugs=3.1.0-RC1
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[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
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		_ Prechecks _
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		_ trunk Compile Tests _
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0	spotbugs	111	Used deprecated FindBugs config; considering switching to SpotBugs.
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		_ Patch Compile Tests _
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		_ Other Tests _
-1	unit	512	hadoop-common in the patch failed.
+1	asflicense	39	The patch does not generate ASF License warnings.
		6325

Reason	Tests
Failed junit tests	hadoop.security.TestShellBasedIdMapping

Subsystem	Report/Notes
Docker	Client=19.03.1 Server=19.03.1 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1300/2/artifact/out/Dockerfile
GITHUB PR	#1300
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versions	git=2.7.4 maven=3.3.9 findbugs=3.1.0-RC1
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[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	41	Docker mode activated.
		_ Prechecks _
+1	dupname	0	No case conflicting files found.
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		_ trunk Compile Tests _
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0	spotbugs	120	Used deprecated FindBugs config; considering switching to SpotBugs.
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		_ Patch Compile Tests _
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		_ Other Tests _
-1	unit	544	hadoop-common in the patch failed.
+1	asflicense	39	The patch does not generate ASF License warnings.
		6111

Reason	Tests
Failed junit tests	hadoop.security.TestShellBasedIdMapping

Subsystem	Report/Notes
Docker	Client=19.03.1 Server=19.03.1 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1300/3/artifact/out/Dockerfile
GITHUB PR	#1300
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versions	git=2.7.4 maven=3.3.9 findbugs=3.1.0-RC1
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[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	57	Docker mode activated.
		_ Prechecks _
+1	dupname	0	No case conflicting files found.
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-1	test4tests	0	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 _
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+1	compile	1258	trunk passed
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		_ Patch Compile Tests _
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		_ Other Tests _
-1	unit	532	hadoop-common in the patch failed.
+1	asflicense	47	The patch does not generate ASF License warnings.
		6961

Reason	Tests
Failed junit tests	hadoop.security.TestShellBasedIdMapping

Subsystem	Report/Notes
Docker	Client=19.03.1 Server=19.03.1 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1300/4/artifact/out/Dockerfile
GITHUB PR	#1300
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versions	git=2.7.4 maven=3.3.9 findbugs=3.1.0-RC1
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[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	97	Docker mode activated.
		_ Prechecks _
+1	dupname	0	No case conflicting files found.
+1	@author	0	The patch does not contain any @author tags.
-1	test4tests	0	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 _
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		_ Patch Compile Tests _
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		_ Other Tests _
-1	unit	571	hadoop-common in the patch failed.
+1	asflicense	50	The patch does not generate ASF License warnings.
		6900

Reason	Tests
Failed junit tests	hadoop.security.TestShellBasedIdMapping

Subsystem	Report/Notes
Docker	Client=19.03.1 Server=19.03.1 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1300/5/artifact/out/Dockerfile
GITHUB PR	#1300
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versions	git=2.7.4 maven=3.3.9 findbugs=3.1.0-RC1
Powered by	Apache Yetus 0.10.0 http://yetus.apache.org

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[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	0m 39s	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 ❌	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 _
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+1 💚	compile	21m 31s	trunk passed with JDK Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1
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		_ Other Tests _
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+1 💚	asflicense	0m 50s	The patch does not generate ASF License warnings.
		155m 35s

Reason	Tests
Failed junit tests	hadoop.security.TestShellBasedIdMapping

Subsystem	Report/Notes
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GITHUB PR	#1300
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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.