I'm reading the documentation of orion Context Broker and in the command line arguments I dont see any argument to set the read preference to my replicaset of mongoDB. In my application I need to set that the read preference have the option nearest to avoid bottle necks in high query traffic periods. Does anyone know if is possible?
1 Answers
Current Orion version (3.3.1) doesn't allow to set read preference. There is an open issue in the Orion repository about implement the -mongoUri CLI parameter to allow setting the MongoDB connection URI (so you could add for instance &readPreference=secondary to it).
Alternatively, you could hack the Orion source code to build an specific version for you with the readPreference value you want. Have a look to composeMongoUri() function. It seems it is a matter of just addding uri += optionPrefix + "readPreference=<whatever you want>"; at the end.
It is not a smart soluction (it is not flexible and you would need to rebuild Orion if you want to change the setting) but it could be a valid workaround while -mongoUri gets implemented.
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