On Fri, Sep 2, 2016 at 2:20 AM, Peter Eisentraut <peter.eisentr...@2ndquadrant.com> wrote: > On 5/13/16 2:39 AM, Michael Paquier wrote: >> So, attached are two patches that apply on HEAD to address the problem >> of pg_basebackup that does not sync the data it writes. As >> pg_basebackup cannot use directly initdb -S because, as a client-side >> utility, it may be installed while initdb is not (see Fedora and >> RHEL), I have refactored the code so as the routines in initdb.c doing >> the fsync of PGDATA and other fsync stuff are in src/fe_utils/, and >> this is 0001. > > Why fe_utils? initdb is not a front-end program.
Thinking about that, you are right. Let's move it to src/common, frontend-only though. >> Patch 0002 is a set of fixes for pg_basebackup: >> - In plain mode, fsync_pgdata is used so as all the tablespaces are >> fsync'd at once. This takes care as well of the case where pg_xlog is >> a symlink. >> - In tar mode (no stdout), each tar file is synced individually, and >> the base directory is synced once at the end. >> In both cases, failures are not considered fatal. > > Maybe there should be --nosync options like initdb has? What do others think about that? I could implement that on top of 0002 with some extra options. But to be honest that looks to be just some extra sugar for what is basically a bug fix... And I am feeling that providing such a switch to users would be a way for one to shoot himself badly, particularly for pg_receivexlog where a crash can cause segments to go missing. -- Michael
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