HDDS-14384. Cleanup PipelineProvider and the related classes.

[szetszwo]

What changes were proposed in this pull request?

• Remove the always empty shutdown() method.
• Remove ReplicationFactor.value.
• Remove the unused RatisPipelineProvider.conf.

What is the link to the Apache JIRA

HDDS-14384

How was this patch tested?

By existing tests.

[ptlrs]

Thanks for the PR @szetszwo.

[ptlrs]

In this PR we are now using a final filter instead of instantiating a new one.
Will the Ozone configurations mapping to these properties ever be modified dynamically?
If so, the instantiated filter won't get the updated values for these configurations.

[szetszwo]

@ptlrs , thanks for reviewing this!

There are final fields such as numPipelinesPerMetadataVolume in SCMNodeManager. It is consistent to make NonWritableNodeFilter final.

For reconf, SCM currently only supports reconf admins; see below. So, the filter cannot be modified dynamically.

ozone/hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/server/StorageContainerManager.java

Lines 401 to 407 in cbea8af

	reconfigurationHandler =
	new ReconfigurationHandler("SCM", conf, this::checkAdminAccess)
	.register(OZONE_ADMINISTRATORS, this::reconfOzoneAdmins)
	.register(OZONE_READONLY_ADMINISTRATORS,
	this::reconfOzoneReadOnlyAdmins);
	reconfigurationHandler.setReconfigurationCompleteCallback(reconfigurationHandler.defaultLoggingCallback());

[ptlrs]

Thanks for the explanation @szetszwo.

[adoroszlai]

Thanks @szetszwo for the patch, @ptlrs for the review.

[szetszwo]

@ptlrs , @adoroszlai , thanks a lot for reviewing this!