Hot Standby Feedback should default to on in 9.3+

Hi,

The subject says it all.

There are workloads where its detrimental, but in general having it
default to on improver experience tremendously because getting conflicts
because of vacuum is rather confusing.

In the workloads where it might not be a good idea (very long queries on
the standby, many dead tuples on the primary) you need to think very
carefuly about the strategy of avoiding conflicts anyway, and explicit
configuration is required as well.

Does anybody have an argument against changing the default value?

Greetings,

Andres Freund

-- Andres Freund                       http://www.2ndQuadrant.com/PostgreSQL Development, 24x7 Support, Training &
Services