Unbalanced replica set reads: php driver (v1.2.6)

[Chris Merz]

Greetings! Here at MapMyFitness.com, we're using MongoDB as a
document store backing for a humongous amount of route data, fronted
by a lightweight rest api served up by apache. We upgraded to version
1.2.6 of the driver, but we're still encountering unbalanced reads
across the replica set. setSlaveOkay(true) is being set at the query
level. Anybody know what might cause a distribution like this?

server1: 156 queries/s
server2: 0 queries/s #primary
server3: 12 queries/s

[Nat]

First you know that when slaveOkay is set, read requests will be mostly served by slave right? For why requests didn't go to the other slave, can you tell more of your setup environment ie which php cgi you are using, your setting, replicaset information etc?

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[Kristina Chodorow]

The driver figures out who it should read from based on average ping
time, so probably server1 is "closer" to your app server than server3.