[DOCS-150] Note that aggregate command can be expensive on mongos Created: 01/Mar/12  Updated: 29/Nov/12  Resolved: 19/Mar/12

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

Type: Improvement Priority: Major - P3
Reporter: Richard Kreuter (Inactive) Assignee: Sam Kleinman (Inactive)
Resolution: Done Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Participants:
Days since reply: 11 years, 48 weeks, 2 days ago

 Description   

In a sharded cluster, aggregate can do a lot of work inside the mongos process. Heretofore, mongos has had a modest computational load; aggregate changes that. We need to make this explicit in the docs someplace.



 Comments   
Comment by Sam Kleinman (Inactive) [ 19/Mar/12 ]

comment inserted

Comment by auto [ 19/Mar/12 ]

Author:

{u'login': u'tychoish', u'name': u'Sam Kleinman', u'email': u'samk@10gen.com'}

Message: DOCS-150 modifying mongos and aggregation documentation to reflect changed performance profile.
Branch: master
https://github.com/mongodb/docs/commit/f8e7e67ec003202d6111e8ec35831c912906e07f

Comment by Richard Kreuter (Inactive) [ 13/Mar/12 ]

Looks kosher to me. Thanks, Sam.

Comment by Sam Kleinman (Inactive) [ 13/Mar/12 ]

Richard,

Can you review the paragraph in the above comment (or reassign it to Dan P., or someone else) and see if I have the note right and then assign the ticket back to me so I can add it to the manual.

Cheers,
sam

Comment by Sam Kleinman (Inactive) [ 05/Mar/12 ]

.. note::
 
   Some aggregation operations using the :dbcommand:`aggregate` will
   cause :program:`mongos` instances to require more CPU resources
   than in previous versions. This modified performance profile may
   dictate alternate architecture decisions if you make use the
   :term:`aggregation framework` extensively in a sharded environment.

Do you think that the above admonition describes this change appropriately or do you think more description or guidance is required?

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