HDFS-16476.Increase the number of metrics used to record PendingRecoveryBlocks.

[jianghuazhu]

Description of PR

Now we don't know how many blocks are happening or are about to recover, the purpose of this pr is to record them through metrics.
Details: HDFS-16476

How was this patch tested?

When some blocks are recovering or are about to recover, you can view the number through metrics.

[hadoop-yetus]

💔 -1 overall

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			_ Patch Compile Tests _
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			_ Other Tests _
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		515m 30s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4010/1/artifact/out/Dockerfile
GITHUB PR	#4010
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Max. process+thread count	3762 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common hadoop-hdfs-project/hadoop-hdfs hadoop-hdfs-project/hadoop-hdfs-rbf U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4010/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[jianghuazhu]

There are some ci/cd related failures here that don't seem to be related.
Here is an example with some online clusters, obtained by getting the NameNode's jmx:

Regarding the display of logarithms, I think the block recovery work is something between NameNode and DataNode, so in the RBF module, I implemented a default value. E.g:
public int getPendingRecoveryBlocks() {
return 0;
}
If compatibility with RBF is required in the future, it can be achieved with minimal code changes.

Would you guys help to review this PR, @ayushtkn @virajjasani .
Thank you very much.

[ayushtkn]

I think the block recovery work is something between NameNode and DataNode, so in the RBF module

For all such cases we have got the values from all namenodes at Router and then summed up for the metrics, So, as at the Router we can have a global look. We should do the same here as well

[jianghuazhu]

OK, I'll try to perfect it as much as possible.

[hadoop-yetus]

💔 -1 overall

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			_ Prechecks _
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			_ trunk Compile Tests _
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			_ Patch Compile Tests _
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			_ Other Tests _
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+1 💚	unit	21m 18s		hadoop-hdfs-rbf in the patch passed.
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		483m 36s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4010/2/artifact/out/Dockerfile
GITHUB PR	#4010
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modules	C: hadoop-common-project/hadoop-common hadoop-hdfs-project/hadoop-hdfs hadoop-hdfs-project/hadoop-hdfs-rbf U: .
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versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
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			_ Prechecks _
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		481m 10s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4010/4/artifact/out/Dockerfile
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versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[hadoop-yetus]

💔 -1 overall

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			_ Patch Compile Tests _
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			_ Other Tests _
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+1 💚	unit	20m 59s		hadoop-hdfs-rbf in the patch passed.
+1 💚	asflicense	1m 10s		The patch does not generate ASF License warnings.
		490m 32s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4010/5/artifact/out/Dockerfile
GITHUB PR	#4010
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modules	C: hadoop-common-project/hadoop-common hadoop-hdfs-project/hadoop-hdfs hadoop-hdfs-project/hadoop-hdfs-rbf U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4010/5/console
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[jianghuazhu]

There are some checkstyle related warnings here, but it doesn't seem to be related to the update I submitted.

[jianghuazhu]

Here are some tests done on an online cluster.
Open the webui address, for example: dfsrouter:50071. The metrics related to PendingRecoveryBlocks will be fully recorded here.

Open the dfsrouter jmx address, for example: dfsrouter:50071/jmx. The metrics related to PendingRecoveryBlocks will be fully recorded here.

Can you help review this pr again, @ayushtkn .
Thank you very much.