Quanah Gibson-Mount wrote:

--On Tuesday, February 07, 2017 8:53 AM +0000 Howard Chu hyc@symas.com wrote:

...

The relevant part of the doc is "It must be set TRUE when using the accesslog overlay for delta-based syncrepl support." Otherwise it has no effect, so there is no reason to change it in the default case.

Actually, what the manpage says is:

This option should be set TRUE when working with newer releases that properly support this flag. It must be set TRUE when using the accesslog overlay for delta-based syncrepl replication support.

So, that clearly states it should *always* be TRUE unless you have a 2.3.11 or earlier consumer, which is technically not allowable. There is zero reason for this tunable to exist. It should be deprecated and the internal code changed to simply set the flag to TRUE. One less item for anyone to have to ever deal with is a win.

"when working with newer releases that properly support this flag."

The syncrepl consumer only pays attention to this flag in delta-sync. There is no reason to use reloadhint in regular syncrepl. Turning it on by default only slows down the refresh negotiation in regular syncrepl.