Maintaining capped collection in Master but not in Slave.

[kumar]

Hi All,

We are going to use "Master/Slave" configuration.

Is it possible to make one collection as capped collection in Master
and maintaining all documents of same collection in Slave?

Thanks,
Kumar

[Scott Hernandez]

No, there is no option for that. The goal of replication it have the
*same* data on all nodes.

If you wanted to do this you could but it would require stopping the
slave and starting up in non-slave mode, changing the collection to
not be capped, and then starting it in slave mode again. Replication
does not check the state of the collection once replication has been
established -- it just replicates data changes.

This is not something suggested or supported.

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[Manan Shah]

Not true. My system.profile collection and all the _bkp versions of it didnt get replicated for the data part on the secondaries although the name of such collections did get replicated. Very strange!

Interestingly the system.profile capped collection itself isnt getting replicated. Any idea why?

group:PRIMARY> db.system.profile.count()
28358

group:SECONDARY> db.system.profile.count()
0

group:PRIMARY> db.system.profile_rockmongo_bk_52461190e998a.count()

869423

group:SECONDARY> db.system.profile_rockmongo_bk_52461190e998a.count()

0

[Jeff Lee]

Profiling operations are not replicated.

http://docs.mongodb.org/manual/administration/monitoring/#database-profiling

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