RE: [HACKERS] Allowing WAL fsync to be done via O_SYNC

[Mikheev, Vadim]

> I believe that we don't know enough yet to nail down a hard-wired
> decision.  Vadim's idea of preferring O_DSYNC if it appears to be
> different from O_SYNC is a good first cut, but I think we'd 
> better make it possible to override that, at least for testing purposes.

So let's leave fsync as default and add option to open log files
with O_DSYNC/O_SYNC.

Vadim

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