[Tarantool-patches] [RFC v3 1/3] xrow: allow to pass timestamp via xrow_encode_vclock_timed helper

[Cyrill Gorcunov]

On Mon, May 03, 2021 at 11:21:09PM +0300, Konstantin Osipov wrote:
> * Cyrill Gorcunov via Tarantool-patches <tarantool-patches at dev.tarantool.org> [21/04/30 18:43]:
> > We will enhance applier writer with timestamp of last written row.
> > It is needed to detect downstream lag.
> 
> LSN is already 64 bit and can very well fit a timestamp within a
> very reasonable range (e.g nanosecond resolution, timeuuid range).
> 
> I think you shouldn't add a new field, just change the way LSN is
> generated.

Kostya, I fear I don't get it. Currently we send back current
vclock and in the header we have the "tm" field which has been
unused before this patch. Now we start using it by sending
timestamp there. Which exactly LSN you propose to change?