[DOCS-475] document the nonAtomic flag of MR Created: 01/Sep/12  Updated: 30/Oct/23  Resolved: 27/Sep/12

Status: Closed
Project: Documentation
Component/s: manual
Affects Version/s: None
Fix Version/s: Server_Docs_20231030

Type: Task Priority: Major - P3
Reporter: Antoine Girbal Assignee: Antoine Girbal
Resolution: Done Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Participants:
Days since reply: 11 years, 20 weeks, 6 days ago

 Description   

Following was added to wiki
http://www.mongodb.org/display/DOCS/MapReduce

  • { nonAtomic : 1} - MongoDB 2.1+ If true then the post processing step will not be executed under the write lock. This option makes sense only for the "merge" and "replace" output which take time to process and would lock the database. Using this flag means that partial results will be visible as they are processed.


 Comments   
Comment by auto [ 27/Sep/12 ]

Author:

{u'date': u'2012-09-27T12:35:52-07:00', u'email': u'samk@10gen.com', u'name': u'Sam Kleinman'}

Message: DOCS-475 style edits
Branch: master
https://github.com/mongodb/docs/commit/b14851b43dabe0c27eac272755add5743a521dc2

Comment by auto [ 27/Sep/12 ]

Author:

{u'date': u'2012-09-27T12:33:23-07:00', u'email': u'samk@10gen.com', u'name': u'Sam Kleinman'}

Message: merge: DOCS-475
Branch: master
https://github.com/mongodb/docs/commit/91edceecb413ca67210bb9d3ff2234f72251c747

Comment by auto [ 27/Sep/12 ]

Author:

{u'date': u'2012-09-27T12:22:17-07:00', u'email': u'kay.kim@10gen.com', u'name': u'kay'}

Message: DOCS-475 nonAtomic doc for mapReduce
Branch: master
https://github.com/mongodb/docs/commit/8434deedb294083264b08915b3e938e337149303

Comment by auto [ 27/Sep/12 ]

Author:

{u'date': u'2012-09-27T07:12:53-07:00', u'email': u'kay.kim@10gen.com', u'name': u'kay'}

Message: DOCS-475 nonAtomic doc
Branch: master
https://github.com/mongodb/docs/commit/7a1d47f14ec1486d0064b39f3e69c93350c513b5

Comment by auto [ 27/Sep/12 ]

Author:

{u'date': u'2012-09-26T21:05:36-07:00', u'email': u'kay.kim@10gen.com', u'name': u'kay'}

Message: DOCS-475 nonAtomic option documentation
Branch: master
https://github.com/mongodb/docs/commit/a4d3f395dbd7851565f58d81dd1849c5b12e00df

Comment by Antoine Girbal [ 27/Sep/12 ]

that's my mistake: it only makes sense for merge and reduce.
fixing wiki now.

Comment by Scott Hernandez (Inactive) [ 01/Sep/12 ]

This makes it behave like normal (multi) updates, and is the oposite of the $atomic (which should be called $isolated) option with updates.

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