Querying Sharded and Replicated System

[Ed Brown]

I have a Mongo system set up so that it is sharded and contains a replica set. I want to load documents into the primary and query against the secondary. Do I need to have "mongos" processes for both the primary and the secondary system or do I just have mongos processes for the primary and when I  want to query, I specify "slaveOK"?

Thanks.

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Ed Brown

[Max Schireson]

http://www.mongodb.org/display/DOCS/Connecting+to+Replica+Sets+from+Clients

You don't need a mongos unless you are sharding. Details vary with he driver you are using.

-- Max

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[Ed Brown]

[Ed Brown]

On Sunday, April 29, 2012 8:10:31 PM UTC-4, Max Schireson wrote:

http://www.mongodb.org/display/DOCS/Connecting+to+Replica+Sets+from+Clients

You don't need a mongos unless you are sharding. Details vary with he driver you are using.

That's my question, I am sharding. So I understand that I need the mongos, but do I need the mongos on the replicated servers to be able to query the secondary or will mongos handle querying the secondary if I specify "slaveOK"?

-- Max

On Apr 29, 2012 4:40 PM, "Ed Brown" <edbro...@gmail.com> wrote:

I have a Mongo system set up so that it is sharded and contains a replica set. I want to load documents into the primary and query against the secondary. Do I need to have "mongos" processes for both the primary and the secondary system or do I just have mongos processes for the primary and when I  want to query, I specify "slaveOK"?

Thanks.

---

Ed Brown

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On Sunday, April 29, 2012 8:10:31 PM UTC-4, Max Schireson wrote:

http://www.mongodb.org/display/DOCS/Connecting+to+Replica+Sets+from+Clients

You don't need a mongos unless you are sharding. Details vary with he driver you are using.

-- Max

On Apr 29, 2012 4:40 PM, "Ed Brown" <edbro...@gmail.com> wrote:

I have a Mongo system set up so that it is sharded and contains a replica set. I want to load documents into the primary and query against the secondary. Do I need to have "mongos" processes for both the primary and the secondary system or do I just have mongos processes for the primary and when I  want to query, I specify "slaveOK"?

Thanks.

---

Ed Brown

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To unsubscribe from this group, send email to mongodb-user+unsubscribe@googlegroups.com.

[Adam C]

Yes, if you pass slaveOK to the mongos it will send the queries to (arbitrarily selected) secondaries, in a very similar way to when you connect via a driver to a regular replica set.

Adam

[Ed Brown]

On Monday, April 30, 2012 12:45:48 PM UTC-4, Adam C wrote:

Yes, if you pass slaveOK to the mongos it will send the queries to (arbitrarily selected) secondaries, in a very similar way to when you connect via a driver to a regular replica set.

Adam

That answers my question.

Thank you.

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Ed Brown