[DOCS-12018] Docs for SERVER-35954: Build uniqueKey from the shard key if not present in user command Created: 04/Sep/18  Updated: 13/Nov/23  Resolved: 01/Oct/18

Status: Closed
Project: Documentation
Component/s: manual, Server
Affects Version/s: None
Fix Version/s: 4.1.3, Server_Docs_20231030, Server_Docs_20231106, Server_Docs_20231105, Server_Docs_20231113

Type: Task Priority: Major - P3
Reporter: Kay Kim (Inactive) Assignee: Unassigned
Resolution: Fixed Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Documented
documents SERVER-35954 Build uniqueKey from the shard key if... Closed
Related
related to DOCS-12028 New syntax for $out aggregation stage Closed
Participants:
Days since reply: 5 years, 23 weeks, 1 day ago
Epic Link: DOCS: 4.2 Server/Tools

 Description   

Description

Description:

The 'uniqueKey' field is optional to the $out stage. If not specified and the collection is sharded, the uniqueKey will become the shard key plus the _id (if the _id is not already part of the shard key).

Engineering Ticket Description:

If the aggregation is run in a cluster, the unique key should be the _id and all of the fields of the shard key. Otherwise, the unique key is just the _id.

Scope of changes

Impact to Other Docs

MVP (Work and Date)

Resources (Scope or Design Docs, Invision, etc.)


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