Enforce uniqueness of flow/atom details uuids/keys

Bug #1423658 reported by Joshua Harlow on 2015-02-19
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Timofey Durakov

Bug Description

In the current *persistence* backends there is an implied rule that flow/atom details objects have unique uuids and should not conflict on these with any other flow/atom details (ever). Having an implied rule is not the best approach, and we should have checks in place (that raise exceptions) when a duplicate uuid is saved so that at run-time/save-time it blows up when this kind of conflict is triggered. This makes the rule explicit and validated; making bugs and issues less and makes the persistence behaviors that much more predictable/understandable...

Some solutions/ideas:

-> Rename uuid -> key (since its really a unique 'key') [this can be a later change if needed]
-> Have backends able to influence what is a 'valid' key/uuid (but have all implementations raise errors when duplicates are found)
-> Have backends validate uniqueness *before* saving any results (this is more applicable to backends that are not transactional, such as the filesystem backend; the sqlalchemy and zookeeper backend use transactions so checking later should be fine, since the transaction will not be committed until all validations have occurred).

Joshua Harlow (harlowja) on 2015-02-19
Changed in taskflow:
importance: Undecided → High
Changed in taskflow:
status: New → Confirmed
Changed in taskflow:
assignee: nobody → Timofey Durakov (tdurakov)
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