[SERVER-68766] Add option to re-enable single value MapReduce optimization Created: 11/Aug/22 Updated: 29/Oct/23 Resolved: 29/Aug/22 |
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| Status: | Closed |
| Project: | Core Server |
| Component/s: | None |
| Affects Version/s: | None |
| Fix Version/s: | 4.4.17, 5.0.12, 6.0.2, 6.1.0-rc1, 6.2.0-rc0 |
| Type: | Bug | Priority: | Major - P3 |
| Reporter: | Davis Haupt (Inactive) | Assignee: | Davis Haupt (Inactive) |
| Resolution: | Fixed | Votes: | 0 |
| Labels: | None | ||
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Issue Links: |
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| Backwards Compatibility: | Fully Compatible | ||||||||||||||||||
| Operating System: | ALL | ||||||||||||||||||
| Backport Requested: |
v6.1, v6.0, v5.0, v4.4
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| Steps To Reproduce: | Running against mongod version 4.4:
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| Sprint: | QO 2022-08-22, QO 2022-09-05 | ||||||||||||||||||
| Participants: | |||||||||||||||||||
| Case: | (copied to CRM) | ||||||||||||||||||
| Description |
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This is in the documentation for MapReduce from 4.2 to 6.0:
However, from 4.4 onwards, the reduce function will be called regardless of how many values are associated with a given key. PM-766 added a new execution engine for MapReduce commands based on the Aggregation Framework that is active in 4.4 and above.
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| Comments |
| Comment by Githook User [ 31/Aug/22 ] |
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Author: {'name': 'Davis Haupt', 'email': 'davis.haupt@mongodb.com', 'username': 'davish'}Message: |
| Comment by Githook User [ 29/Aug/22 ] |
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Author: {'name': 'Davis Haupt', 'email': 'davis.haupt@mongodb.com', 'username': 'davish'}Message: |
| Comment by Githook User [ 29/Aug/22 ] |
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Author: {'name': 'Davis Haupt', 'email': 'davis.haupt@mongodb.com', 'username': 'davish'}Message: |
| Comment by Githook User [ 29/Aug/22 ] |
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Author: {'name': 'Davis Haupt', 'email': 'davis.haupt@mongodb.com', 'username': 'davish'}Message: |
| Comment by Githook User [ 26/Aug/22 ] |
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Author: {'name': 'Davis Haupt', 'email': 'davis.haupt@mongodb.com', 'username': 'davish'}Message: |