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From "ASF subversion and git services (JIRA)" <>
Subject [jira] [Commented] (ATLAS-3043) Unique attributes constraint at store-level
Date Sat, 02 Feb 2019 19:59:00 GMT


ASF subversion and git services commented on ATLAS-3043:

Commit 0e0f217af2b7c142ebc1445b86ba5570a3b69684 in atlas's branch refs/heads/master from Madhan
[;h=0e0f217 ]

ATLAS-3043: added unique-attributes constraints at store-level

Change-Id: Ica44b1739b504bebc2ab39dc856ccb079b8f4003

> Unique attributes constraint at store-level
> -------------------------------------------
>                 Key: ATLAS-3043
>                 URL:
>             Project: Atlas
>          Issue Type: Bug
>          Components:  atlas-core
>            Reporter: Madhan Neethiraj
>            Assignee: Madhan Neethiraj
>            Priority: Major
>             Fix For: 2.0.0
>         Attachments: ATLAS-3043.patch
> Atlas data-model allows marking an attribute as unique; and on entity create/update operations,
Atlas verifies that this constraint is not violated i.e. no more than one *active* entity
of a given entity-type can have same value for a unique-attribute.
> However, no store-level constraint is created to enforce uniqueness. This is likely to
be due to the fact that there can be multiple *deleted* entities with the same typeName &
unique-attribute value. And having such store-level constraint wouldn't allow this to exist.
> An alternate approach is to create a 'shadow-property' at the store-level for the unique-attribute;
and this property should be set only for active entities. When an entity is deleted, this
'shadow-property' will be removed from the entity-vertex. In this approach, the unique-constraint
can be set at the store level for the 'shadow-property'. In addition to enforcing the constraint
at the store level, it might also help in quicker entity-retrieval given typeName and unique-attribute.

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