[SERVER-5504] Allow map-reduce jobs to run on replicas, provided the output is into the "local" database Created: 04/Apr/12  Updated: 28/Jun/14  Resolved: 18/Sep/12

Status: Closed
Project: Core Server
Component/s: MapReduce, Replication
Affects Version/s: 2.1.0
Fix Version/s: None

Type: New Feature Priority: Minor - P4
Reporter: Ben Osheroff Assignee: Unassigned
Resolution: Won't Fix Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
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is related to SERVER-8853 MapReduce jobs execute exclusively on... Closed
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 Description   

This patch allows Map-Reduce jobs to be run on a replica. I've tested this locally, it seems to play quite well with the op-log.

https://github.com/mongodb/mongo/pull/194



 Comments   
Comment by Eliot Horowitz (Inactive) [ 18/Sep/12 ]

Trying to keep local for system/replication only.
There are some other ideas for how to do secondary map/reduces though.

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