HDFS-17395. [FGL] Use FSLock to protect ErasureCodingPolicy related operations

[ZanderXu]

NameNode supports dynamically change ErasureCodingPolicy, so these ErasureCodingPolicies should be protected by one lock, the current implementation uses the global lock.

ErasureCodingPolicy mainly involves directory tree and edits logs, such as:

• getErasureCodingPolicy(String src)
• setErasureCodingPolicy(String src, String ecPolicyName)
• addErasureCodingPolicies(ErasureCodingPolicy[] policies)
• disableErasureCodingPolicy(String ecPolicyName)
• enableErasureCodingPolicy(String ecPolicyName)

So we can use the FSLock to make these operations thread safe.

Another reason why we use the FSLock to protect ErasureCodingPolicy related operations is that we use FSLock to make edit write operations thread safe. 

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	7m 28s		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 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.
			_ HDFS-17384 Compile Tests _
+1 💚	mvninstall	32m 5s		HDFS-17384 passed
+1 💚	compile	0m 45s		HDFS-17384 passed with JDK Ubuntu-11.0.22+7-post-Ubuntu-0ubuntu220.04.1
+1 💚	compile	0m 41s		HDFS-17384 passed with JDK Private Build-1.8.0_392-8u392-ga-1~20.04-b08
+1 💚	checkstyle	0m 41s		HDFS-17384 passed
+1 💚	mvnsite	0m 44s		HDFS-17384 passed
+1 💚	javadoc	0m 40s		HDFS-17384 passed with JDK Ubuntu-11.0.22+7-post-Ubuntu-0ubuntu220.04.1
+1 💚	javadoc	1m 5s		HDFS-17384 passed with JDK Private Build-1.8.0_392-8u392-ga-1~20.04-b08
+1 💚	spotbugs	1m 42s		HDFS-17384 passed
+1 💚	shadedclient	20m 19s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 36s		the patch passed
+1 💚	compile	0m 36s		the patch passed with JDK Ubuntu-11.0.22+7-post-Ubuntu-0ubuntu220.04.1
+1 💚	javac	0m 36s		the patch passed
+1 💚	compile	0m 35s		the patch passed with JDK Private Build-1.8.0_392-8u392-ga-1~20.04-b08
+1 💚	javac	0m 35s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 30s		the patch passed
+1 💚	mvnsite	0m 36s		the patch passed
+1 💚	javadoc	0m 32s		the patch passed with JDK Ubuntu-11.0.22+7-post-Ubuntu-0ubuntu220.04.1
+1 💚	javadoc	0m 57s		the patch passed with JDK Private Build-1.8.0_392-8u392-ga-1~20.04-b08
+1 💚	spotbugs	1m 41s		the patch passed
+1 💚	shadedclient	20m 26s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
-1 ❌	unit	207m 6s	/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt	hadoop-hdfs in the patch passed.
+1 💚	asflicense	0m 31s		The patch does not generate ASF License warnings.
		301m 58s

Reason	Tests
Failed junit tests	hadoop.hdfs.protocol.TestBlockListAsLongs
	hadoop.hdfs.server.datanode.TestLargeBlockReport
	hadoop.hdfs.tools.TestDFSAdmin

Subsystem	Report/Notes
Docker	ClientAPI=1.44 ServerAPI=1.44 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6579/3/artifact/out/Dockerfile
GITHUB PR	#6579
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 3a65e8ced70c 5.15.0-94-generic #104-Ubuntu SMP Tue Jan 9 15:25:40 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	HDFS-17384 / 1ba05cb
Default Java	Private Build-1.8.0_392-8u392-ga-1~20.04-b08
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.22+7-post-Ubuntu-0ubuntu220.04.1 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_392-8u392-ga-1~20.04-b08
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6579/3/testReport/
Max. process+thread count	5351 (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-6579/3/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[ferhui]

Very clear to me. +1

[haiyang1987]

LGTM. +1.

[ZanderXu]

Thanks @ferhui and @haiyang1987 for your review. Merged