[ncc-services-wg] Re: [db-wg] Proposal - Maintaining person, role and domain objects

Stage 1 makes a lot of sense to me as it has little consequences to  
older data while it makes sure new information going into the DB has  
a better chance of being kept as originally posted by the object  
creator.
The other stages do need a bit more discussion as they may in fact  
affect a lot of legacy data and have the potential to add a burden to  
LIR operations. I am in favour of those extra steps, just think that  
there is a need to repeat the warnings and announcements before and  
insist on people making an impact analysis on their operations.

Joao Damas

On 21 Jun 2007, at 14:41, Denis Walker wrote:

> [Apologies for duplicate mails]
>
> Dear Colleagues,
>
> As a result of discussions during the Database Working Group  
> session at
> RIPE 54, the RIPE NCC has nine proposals and implementation plans to
> present to the community. Although most of them are now in the final
> stages of preparation, we will send them out one at a time over the  
> next
> few weeks for consideration by the community.
>
> The first one concerns maintaining all objects in the RIPE  
> Database, which
> followed from a recommendation from the Data Protection Task Force  
> (DP TF)
> (see below). We have already had some preliminary discussions about  
> this
> with the DP TF. They provided the RIPE NCC with some very useful  
> feedback,
> which is incorporated in this proposal.
>
> Regards
> Denis Walker
> RIPE NCC
>
>
>
> Maintaining person, role and domain objects
> -------------------------------------------
>
>   * Introduction
>   * Proposal
>   * Illustrations of how the checks work
>     - New startup
>     - Closing down
>     - Modifying existing data
>   * Implementation
>     - Stage 1
>     - Stage 2
>     - Stage 3
>   * Statistics
>
>
> Introduction
> ------------
> It was agreed at RIPE 54 that the "mnt-by:" attribute would be made
> mandatory on all objects. Currently, for person, role and domain
> objects, "mnt-by:" is optional. Making "mnt-by:" mandatory on person
> objects raises two clear issues:
>
>   1. It creates a chicken and egg situation between person and mntner
>      objects.
>   2. Many person objects are not changed for years, so any change to
>      syntax may take a long time to be reflected in the database. Many
>      un-maintained person objects could therefore remain so for many
>      years.
>
> Proposal
> --------
> Making "mnt-by:" mandatory on role and domain objects does not cause
> any technical difficulties.
>
> To address all the issues relating to the person objects, we suggest a
> slightly different approach.
>
>   1. Make "mnt-by:" mandatory in person objects.
>   2. Provide a mechanism in dbupdate to handle the startup case  
> where a
>      new person and mntner objects are required.
>   3. Provide a mechanism in dbupdate to handle the closing down
>      situation where the last person and mntner objects are to be
>      deleted.
>   4. Extend the referential integrity checks so that a person object
>      cannot be referenced unless it is maintained, except in a mntner
>      object.
>   5. Extend the referential integrity checks so that a mntner object
>      cannot be referenced unless the person objects it references are
>      maintained. This does not include the cyclic case of a person and
>      mntner object referencing each other.
>
> The referencing checks sound complicated in words, but are actually
> quite simple. The illustrations below explain how it works in  
> practice.
>
> This approach has a number of advantages:
>
>   1. It accommodates the chicken and egg situation.
>   2. We already do referential integrity checks. Whenever there is a
>      reference to a person object, the database software checks if the
>      person object exists. We only have to extend this check to see if
>      the person object is also maintained.
>   3. Whenever there is a reference to a mntner object, the database
>      software checks if the mntner object exists. We only have to  
> extend
>      this check to see if the person objects referenced by the mntner
>      are maintained.
>   4. Each time any other object (say an inetnum or aut-num) is
>      modified, the referenced person objects need to be maintained. If
>      not, the update will fail. This will not prevent anyone from  
> working.
>      If they are going to modify an inetnum object, they must be  
> authorised
>      to do so. They can apply the same mntner to any un-maintained  
> person
>      objects. This encourages users to maintain the existing person
>      objects. A CGI script may be provided to make this process  
> simple and
>      quick if it is considered to be helpful.
>   5. No un-maintained person object can be linked to the white  
> pages to
>      avoid deletion. (The white pages will be explained in a later  
> proposal.)
>
>
> Illustrations of how the checks work
> ------------------------------------
>
> New startup
> Send an update message to dbupdate to create a person object and a
> mntner object. These must be the first two objects in an update
> message, in any order. The references to each other must also be in
> place. The database software will accommodate this.
>
>   person:         Den is
>   address:        RIPE Network Coordination Centre (NCC)
>   address:        Singel 258
>   address:        1016 AB Amsterdam
>   address:        The Netherlands
>   phone:          +31 20 535 4444
>   nic-hdl:        DW-RIPE
>   mnt-by:         aardvark-mnt
>   notify:         denis at ripe.net
>   changed:        denis at ripe.net 20040318
>   source:         RIPE
>
>   mntner:         AARDVARK-MNT
>   descr:          Mntner for denis' objects.
>   admin-c:        DW-RIPE
>   tech-c:         DW-RIPE
>   upd-to:         denis at ripe.net
>   auth:           X509-1
>   notify:         denis at ripe.net
>   mnt-by:         AARDVARK-MNT
>   referral-by:    RIPE-DBM-MNT
>   changed:        denis at ripe.net 20040225
>   source:         RIPE
>
> The update software will recognise that the first person/mntner object
> references a non-existent mntner/person object. It will check that  
> this
> referenced object is next in the update message. If it is, the "mnt-
> by:" attribute will be removed from the person object. The person and
> mntner objects will be created, and then the person object will be
> modified to add back the "mnt-by:" attribute.
>
> The objects are now fully configured and can be used. The person  
> object
> can be referenced by any other object where a nic-hdl is  
> referenced. It
> can also be linked to the white pages. The mntner can be used to
> protect any data in the database.
>
> If the non-existent referenced object is not next in the update  
> message
> then an error message will be generated and the update will fail. This
> is the current behaviour.
>
>
> Closing down
> The same situation occurs when closing down and deleting all the data.
> It is possible to delete all data except for the last person and  
> mntner
> objects in the normal way. To delete these last two, send them  
> together
> in an update message, both marked with the "delete:" pseudo attribute.
> Only these two objects should be in the update message.
>
> The update software will recognise that the first person/mntner object
> to delete is referenced in a mntner/person object. It will check that
> this referencing object is next in the update message and also marked
> for deletion. If so the person object will be modified first to remove
> the "mnt-by:" attribute. The mntner object will then be deleted,
> followed by the person object.
>
>
> Modifying existing data
> Suppose some data is to be modified and there is a reference to an un-
> maintained person object.
>
> Suppose you already have this data in the database:
>
>   inetnum:        193.0.0.0 - 193.0.7.255
>   netname:        RIPE-NCC
>   descr:          RIPE Network Coordination Centre
>   descr:          Amsterdam, Netherlands
>   remarks:        Used for RIPE NCC infrastructure.
>   country:        NL
>   admin-c:        DW-RIPE
>   tech-c:         DW-RIPE
>   status:         ASSIGNED PI
>   mnt-by:         AARDVARK-MNT
>   mnt-lower:      AARDVARK-MNT
>   changed:        bit-bucket at ripe.net 20060221
>   source:         RIPE
>
>   person:         Den is
>   address:        RIPE Network Coordination Centre (NCC)
>   address:        Singel 258
>   address:        1016 AB Amsterdam
>   address:        The Netherlands
>   phone:          +31 20 535 4444
>   nic-hdl:        DW-RIPE
>   notify:         denis at ripe.net
>   changed:        denis at ripe.net 20040318
>   source:         RIPE
>
>   mntner:         AARDVARK-MNT
>   descr:          Mntner for denis' objects.
>   admin-c:        DW-RIPE
>   tech-c:         DW-RIPE
>   upd-to:         denis at ripe.net
>   auth:           X509-1
>   notify:         denis at ripe.net
>   mnt-by:         AARDVARK-MNT
>   referral-by:    RIPE-DBM-MNT
>   changed:        denis at ripe.net 20040225
>   source:         RIPE
>
> The inetnum and mntner objects both reference a person object that is
> not maintained. This situation can continue for the foreseeable future
> with no problem. The situation becomes problematic when some data  
> needs
> to be changed.
>
> An attempt to modify the inetnum object will fail. This is because it
> references a person object that is not maintained. It also  
> references a
> mntner object which references un-maintained person objects. (This  
> will
> only happen in stage three of the implementation)
>
> These person objects will have to be maintained before the inetnum
> object can be modified. A CGI script will be provided to allow this to
> be done quickly and easily.
>
> When all referenced person objects are maintained, the original update
> can be resubmitted and will proceed.
>
>
> Implementation
> As with the CRYPT-PW deprecation this will have a staged rollout.
>
> Stage 1
>
>   * No new person, role or domain objects can be created without a
>     "mnt-by:" attribute.
>   * Any un-maintained person, role or domain object cannot be modified
>     without adding a "mnt-by:" attribute.
>   * Any update where objects reference an un-maintained person object,
>     either directly or through a mntner with such references, will
>     generate a warning message in the acknowledgement.
>
> In this stage the acknowledgement message may include these warnings:
>
>   ***WARNING: Un-maintained person object referenced [DW-RIPE]
>   ***WARNING: Un-maintained person object referenced [DW-RIPE] in
>   mntner [AARDVARK-MNT]
>
> Stage 2
>
>   * Any update where objects reference an un-maintained person object,
>     either directly or through a mntner with such references, will
>     generate a warning message in the acknowledgement.
>   * Any NEW reference to an un-maintained person object or to a mntner
>     which has such references will generate an error message in the
>     acknowledgement and the update will fail.
>
> In this stage the acknowledgement message may include these warnings
> and errors:
>
>   ***WARNING: Un-maintained person object referenced [DW-RIPE]
>   ***WARNING: Un-maintained person object referenced [DW-RIPE] in
>   mntner [AARDVARK-MNT]
>   ***ERROR: New reference to un-maintained person object [DW-RIPE]
>   ***ERROR: New reference to un-maintained person object [DW-RIPE] in
>   mntner [AARDVARK-MNT]
>
> Stage 3
>
>   * Any update where objects reference an un-maintained person object,
>     either directly or through a mntner with such references, will
>     generate an error message in the acknowledgement and the update
>     will fail.
>
> In this stage the acknowledgement message may include these errors:
>
>   ***ERROR: Un-maintained person object referenced [DW-RIPE]
>   ***ERROR: Un-maintained person object referenced [DW-RIPE] in mntner
>   [AARDVARK-MNT]
>
>
> Statistics
> ----------
> While not a very statistically valid survey, we looked at a few days
> just after the RIPE meeting to see how many new person objects were
> created with and without mntner objects. We also queried the new
> objects some time after creation to allow for a "mnt-by:" to be added
> later. We also noted how many unique person objects were referenced in
> any objects in update messages with and without mntner objects. AUTO-
> references were ignored in both creations and updates, and multiple
> instances of the same person object being referenced many times were
> counted as one.
>
>    --------------------------------------------------------
>   |   Date   |Created  |Created  |Referenced  |Referenced  |
>   |          |with     |without  |with        |without     |
>   |--------------------------------------------------------|
>   | 20070515 |  156    |   89    |    925     |    726     |
>   | 20070516 |  111    |   67    |   1022     |    486     |
>   | 20070517 |   85    |   48    |    476     |    185     |
>   | 20070518 |   82    |   18    |    679     |    445     |
>    --------------------------------------------------------
>