Metacat

use PUT /obsoletedBy/{pid} for CNCore.setObsoletedBy per our discussion today

Keep the hzIdentifiers set in sync with the Metacat systemmetadata table. If entries are added/updated in the hzSystemMetadata map, make sure the identifier is in the set. If (for some administrative reason) the entry is removed, remove the identifier from the set. This usually doesn't happen.

When loading all keys from Metacat into the hzSystemMetadata map, also load identifiers into the hzIdentifiers set if they are not already there. Although entries may be evicted from the map, the list of identifiers will remain. The list will have a fairly small memory footprint since it's just identifiers.

Add support for the distributed Set of unique identifiers in the storage cluster called 'hzIdentifiers'. This set is a persistent total list of all identifiers (even when entries in the hzSystemMetadata map are evicted). It reflects the state of the identifiers in the postgresql systemmetadata table, but is distributed across the cluster. Add the getIdentifiers() method, which returns the ISet of identifiers.

include new methods needed for replication (in new d1 jars)
https://redmine.dataone.org/issues/2203

add method: setObsoletedBy (https://redmine.dataone.org/issues/2185)
augement new method: deleteReplicationMetadata

remove method: assertRelation
https://redmine.dataone.org/issues/2158

add method: deleteReplicationMetadata
remove method: assertRelation
update the D1 jars
https://redmine.dataone.org/issues/2187
https://redmine.dataone.org/issues/2158

serialize the Identifier for the systemMetadata being registered
https://redmine.dataone.org/issues/2204

Simplify setReplicationStatus() to not call updateReplicationMetadata() if a replica doesn't exist. Just create it and update the system metadata, which we already have a lock for.