Increased database load on the secondaries since RC2
Since the deployment of RC2 the CPU usage on the secondaries has increased from around 20% to around 70%:
Looking at the tuple statistics one particular secondary shows this pattern:
The big increase here is the number of sequentially scanned rows in the users table. This pattern occurs on both secondaries. This increase in load suggests we're doing something bad, something that might even affect availability if we don't solve it.