On Fri, Sep 01, 2017 at 01:37:28PM +0300, Amir Goldstein wrote: > Well since the bug was demonstrated using crash simulator, > I have no idea how often one would run into this with actual power > failure, but does it really matter how often, if we *know* that it can > happen? No, the issue is real. I wonder how much of an issue the additional flushes are in practice. > I am working on a variant of the flushseq you suggested using > log->l_last_sync_lsn that may be simple enough and not as painful > as turning off optimization for WANT_SYNC log buffer. Ok, I'll take a look once you post it.