Good point, could be. We'll try that. Thanks.
----- Original Message Follows ----- From: Kenneth Graves <[email protected]> To: [email protected] Cc: Boston Perl Mongers <[email protected]> Subject: Re: [Boston.pm] Perl flock problem? Date: Fri, 6 Apr 2012 12:47:56 -0500 > Is tar releasing the lock? You might try using flock on a > separate lock file instead of locking the archive itself. > > --kag > > On Apr 6, 2012, at 5:56 AM, [email protected] wrote: > > we're running a pre-forking server with a number of > > child processes which, among other things, archive > > incoming files to a common archive file. Contention > > for the tar file is handled by perl's flock: > > > > .... > > my $fh = IO::File->new(">> > > $archdir/$arch_filename") || die "Can't open > > archive file: $archdir/$arch_filename : $!\n"; > > flock($fh, LOCK_EX); > > system('tar', $opts, "$archdir/$arch_filename", > > "$basefilename") == 0 > > || die "Can't add $basefilename to > > $archdir/$arch_filename - $!"; > > flock($fh, LOCK_UN); > > $fh->close(); > > .... > > > > We are finding from the log that when competing child > > processes execute this code within the same 80 msec. or > > less window that a directory checksum within the tar > > gets corrupted unrecoverably since tar spits out this > > error before exiting: > > > > directory checksum error > > > > Once this happens the archive is unusable. Outside of > > that contention time band there's *never* a directory > > checksum error. > > > > I can't see any problem with the perl or the use of > > flock and yet the circumstances seem to suggest some > > sort of problem with the file locking. Am I missing > > something? This runs on HPUX 11.11 and invokes HPUX's > > tar. Is there any known problem with perl's flock on > > this system or the interaction of flock and tar? > > > > TIA, > > > > Jim Eshelman > > > > > > > > > > > > > > > > > > _______________________________________________ > > Boston-pm mailing list > > [email protected] > > http://mail.pm.org/mailman/listinfo/boston-pm > > > _______________________________________________ > Boston-pm mailing list > [email protected] > http://mail.pm.org/mailman/listinfo/boston-pm _______________________________________________ Boston-pm mailing list [email protected] http://mail.pm.org/mailman/listinfo/boston-pm
