HDFS-16973. RBF: MountTableResolver cache size lookup should take read lock

[virajjasani]

Mount table resolver location cache gets invalidated by taking write lock as part of addEntry/removeEntry/refreshEntries calls. Since the write lock exclusively updates the cache, getDestinationForPath already takes read lock before accessing the cache. Similarly, retrieval of the cache size should also take the read lock.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 48s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 1s		codespell was not available.
+0 🆗	detsecrets	0m 1s		detect-secrets 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	42m 19s		trunk passed
+1 💚	compile	0m 43s		trunk passed with JDK Ubuntu-11.0.18+10-post-Ubuntu-0ubuntu120.04.1
+1 💚	compile	0m 37s		trunk passed with JDK Private Build-1.8.0_362-8u362-ga-0ubuntu1~20.04.1-b09
+1 💚	checkstyle	0m 29s		trunk passed
+1 💚	mvnsite	0m 42s		trunk passed
+1 💚	javadoc	0m 48s		trunk passed with JDK Ubuntu-11.0.18+10-post-Ubuntu-0ubuntu120.04.1
+1 💚	javadoc	0m 55s		trunk passed with JDK Private Build-1.8.0_362-8u362-ga-0ubuntu1~20.04.1-b09
+1 💚	spotbugs	1m 32s		trunk passed
+1 💚	shadedclient	23m 41s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 35s		the patch passed
+1 💚	compile	0m 39s		the patch passed with JDK Ubuntu-11.0.18+10-post-Ubuntu-0ubuntu120.04.1
+1 💚	javac	0m 39s		the patch passed
+1 💚	compile	0m 31s		the patch passed with JDK Private Build-1.8.0_362-8u362-ga-0ubuntu1~20.04.1-b09
+1 💚	javac	0m 31s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 16s		the patch passed
+1 💚	mvnsite	0m 34s		the patch passed
+1 💚	javadoc	0m 32s		the patch passed with JDK Ubuntu-11.0.18+10-post-Ubuntu-0ubuntu120.04.1
+1 💚	javadoc	0m 50s		the patch passed with JDK Private Build-1.8.0_362-8u362-ga-0ubuntu1~20.04.1-b09
+1 💚	spotbugs	1m 20s		the patch passed
+1 💚	shadedclient	23m 24s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	21m 27s		hadoop-hdfs-rbf in the patch passed.
+1 💚	asflicense	0m 34s		The patch does not generate ASF License warnings.
		125m 9s

Subsystem	Report/Notes
Docker	ClientAPI=1.42 ServerAPI=1.42 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5533/1/artifact/out/Dockerfile
GITHUB PR	#5533
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 9db22699164b 4.15.0-206-generic #217-Ubuntu SMP Fri Feb 3 19:10:13 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 7a1c341
Default Java	Private Build-1.8.0_362-8u362-ga-0ubuntu1~20.04.1-b09
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.18+10-post-Ubuntu-0ubuntu120.04.1 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_362-8u362-ga-0ubuntu1~20.04.1-b09
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5533/1/testReport/
Max. process+thread count	2697 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs-rbf U: hadoop-hdfs-project/hadoop-hdfs-rbf
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5533/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

This message was automatically generated.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 48s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets 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	42m 11s		trunk passed
+1 💚	compile	0m 42s		trunk passed with JDK Ubuntu-11.0.18+10-post-Ubuntu-0ubuntu120.04.1
+1 💚	compile	0m 38s		trunk passed with JDK Private Build-1.8.0_362-8u362-ga-0ubuntu1~20.04.1-b09
+1 💚	checkstyle	0m 30s		trunk passed
+1 💚	mvnsite	0m 42s		trunk passed
+1 💚	javadoc	0m 49s		trunk passed with JDK Ubuntu-11.0.18+10-post-Ubuntu-0ubuntu120.04.1
+1 💚	javadoc	0m 57s		trunk passed with JDK Private Build-1.8.0_362-8u362-ga-0ubuntu1~20.04.1-b09
+1 💚	spotbugs	1m 36s		trunk passed
+1 💚	shadedclient	23m 49s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 34s		the patch passed
+1 💚	compile	0m 39s		the patch passed with JDK Ubuntu-11.0.18+10-post-Ubuntu-0ubuntu120.04.1
+1 💚	javac	0m 39s		the patch passed
+1 💚	compile	0m 31s		the patch passed with JDK Private Build-1.8.0_362-8u362-ga-0ubuntu1~20.04.1-b09
+1 💚	javac	0m 31s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 17s		the patch passed
+1 💚	mvnsite	0m 34s		the patch passed
+1 💚	javadoc	0m 33s		the patch passed with JDK Ubuntu-11.0.18+10-post-Ubuntu-0ubuntu120.04.1
+1 💚	javadoc	0m 49s		the patch passed with JDK Private Build-1.8.0_362-8u362-ga-0ubuntu1~20.04.1-b09
+1 💚	spotbugs	1m 29s		the patch passed
+1 💚	shadedclient	24m 50s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	25m 36s		hadoop-hdfs-rbf in the patch passed.
+1 💚	asflicense	0m 35s		The patch does not generate ASF License warnings.
		131m 2s

Subsystem	Report/Notes
Docker	ClientAPI=1.42 ServerAPI=1.42 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5533/2/artifact/out/Dockerfile
GITHUB PR	#5533
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 8d0be9a72ca1 4.15.0-206-generic #217-Ubuntu SMP Fri Feb 3 19:10:13 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 9f23280
Default Java	Private Build-1.8.0_362-8u362-ga-0ubuntu1~20.04.1-b09
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.18+10-post-Ubuntu-0ubuntu120.04.1 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_362-8u362-ga-0ubuntu1~20.04.1-b09
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5533/2/testReport/
Max. process+thread count	2128 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs-rbf U: hadoop-hdfs-project/hadoop-hdfs-rbf
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5533/2/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

This message was automatically generated.