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From Steven Jacobs <>
Subject Re: Metadata Dependencies
Date Wed, 12 Oct 2016 22:11:40 GMT
Yes, "catalog" would be the better word here. Thanks for the clarification.


On Wed, Oct 12, 2016 at 12:38 PM, Mike Carey <> wrote:

> I assume that by "index" you really mean "catalog" (as opposed to index in
> the physical sense)?  I.e., your two proposals are about a possible
> additional metadata dataset in support of extension dependency management?
> On 10/12/16 9:47 AM, Steven Jacobs wrote:
>> Hi,
>> I am trying to get feedback from the group in general about how best to
>> add
>> Metadata Dependencies, particularly in the context of extensions. The
>> functionality that is needed is as follows:
>> *When dropping a metadata entity A (e.g. a dataverse), first check whether
>> A has any metadata entities that depend on it. Then allow these entities
>> two options:*
>> *1) block: don't drop A while this dependent entity exists*
>> *2) chain: when dropping A, drop this dependent entity as well.*
>> One issue to keep in mind here is that with extensions, Asterix will not
>> currently know about metadata datasets added by extensions.
>> So far we have two proposals for this issue:
>> A) Metadata dependency index. When you create an entity that depends on
>> another, add an entry to this index. Check this index when dropping an
>> entity.
>> B) Metadata data set index. All Metadata datasets would be registered in
>> this index, and then we can query them as needed when dropping an entity.
>> In this case we would need some way to specify which fields in these
>> datasets represent dependencies in order to query them properly.
>> We would like any feedback on these two solutions or proposals for
>> alternate solutions.
>> Steven

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