We just had a customer hit this issue. I kind of wonder whether this shouldn't be backpatched: Currently the execution on the primary is O(NBuffers * log(ndrels)) whereas it's O(NBuffers * ndrels) on the standby - with a lot higher constants to boot. That means it's very easy to get into situations where the standy starts to lag behind very significantly.
+1, we faced with that too
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Teodor Sigaev E-mail: teo...@sigaev.ru
WWW: http://www.sigaev.ru/