HADOOP-19579: Update the command usage of NNThroughputBenchmark by adding the "-blockSize" option.

[fuchaohong]

In HDFS-15652, make block size from NNThroughputBenchmark configurable. Benchmarking.md should also be updated.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	8m 21s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 1s		No case conflicting files found.
+0 🆗	codespell	0m 1s		codespell was not available.
+0 🆗	detsecrets	0m 1s		detect-secrets was not available.
+0 🆗	markdownlint	0m 1s		markdownlint was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
+1 💚	mvninstall	22m 18s		trunk passed
+1 💚	mvnsite	0m 49s		trunk passed
+1 💚	shadedclient	42m 36s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 33s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	0m 42s		the patch passed
+1 💚	shadedclient	20m 4s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 25s		The patch does not generate ASF License warnings.
		73m 14s

Subsystem	Report/Notes
Docker	ClientAPI=1.49 ServerAPI=1.49 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7711/1/artifact/out/Dockerfile
GITHUB PR	#7711
JIRA Issue	HADOOP-19579
Optional Tests	dupname asflicense mvnsite codespell detsecrets markdownlint
uname	Linux 4bf23d90b0e0 5.15.0-136-generic #147-Ubuntu SMP Sat Mar 15 15:53:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 309232f
Max. process+thread count	676 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common U: hadoop-common-project/hadoop-common
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7711/1/console
versions	git=2.25.1 maven=3.6.3
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