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As seen in this question setting the max_standby_archive_delay and the max_standby_streaming_delay as -1 on a single replica it may cause the replica on long-running queries to have stale data.

So I thought if I had multiple read replicas and use "smart" load balancing using pgpool-II:

My idea is somehow to "weight" my replicas by its data freshness, the most recent replicated replica would be chosen first in case that I have long-running queries into another ones.

Therefore, the replicas that run long-running read-only queries would have less chances for any client to connect untill my long-running queries to finish.

So how I can configure the pgpool-II to check which of my replicas has the same version of data with my master and take it into consideration when it load balances my connections?

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