2011-03-20 Andreas J. Koenig <andk@cpan.org>
* More options to pass through rrr-client
* More tests
* .recent/ or .rrr/ for metadata
* memory leak in rrr-server
* lockdirectory expiration? server died and blocked fsck for so long.
* rewrite _thaw_without_pathdb as a forked child job to have it
format-independent
* profiling! Rewrite slow parts in C.
* rrr-server probably not robust under all possible conditions; maybe
add some regular fsck or something. Consider the case of IN_Q_OVERFLOW
again.
* signal handlers
* how would an rsync-free HTTP variant look like? See 2008-10-10 again.
* are we sure we do NOT LEAVE DOT FILES around?
* ---- no open todos below this line ----
2011-02-21 Andreas J. Koenig <andk@cpan.org>
* rrr-server has a memory leak
root 16063 94.7 10.6 358404 354600 pts/21 RN Feb18 4117:16 /home/src/perl/repoperls/installed-perls/perl/v5.13.8-16-gf53580f/bin/perl -Ilib bin/rrr-server --verbose /home/ftp/incoming/RECENT-1h.yaml
experimenting with a fork for aggregate():
root 12196 60.2 0.2 13652 9920 pts/21 RN 08:25 1:56 /home/src/perl/repoperls/installed-perls/perl/v5.13.8-16-gf53580f/bin/perl -Ilib bin/rrr-server --verbose /home/ftp/incoming/RECENT-1h.yaml
A delete of several hundred files:
root 12196 72.8 0.3 13792 10056 pts/21 RN 08:25 3:48 /home/src/perl/repoperls/installed-perls/perl/v5.13.8-16-gf53580f/bin/perl -Ilib bin/rrr-server --verbose /home/ftp/incoming/RECENT-1h.yaml
Delete several hundred again:
root 12196 79.8 0.3 14788 10944 pts/21 RN 08:25 6:34 /home/src/perl/repoperls/installed-perls/perl/v5.13.8-16-gf53580f/bin/perl -Ilib bin/rrr-server --verbose /home/ftp/incoming/RECENT-1h.yaml
It's a lot.
2011-02-20 Andreas J. Koenig <andk@cpan.org>
* start consistently considering the RECENT files themselves not part of
the set.
2011-02-19 Andreas J. Koenig <andk@cpan.org>
* Found the term anonymous one way file system
* No support for empty directories
2011-02-17 Andreas J. Koenig <andk@cpan.org>
* ALERT rrr: we have a piece of code somewhere in the mirror()
subroutine that reads the raw YAML file with normal open() and cuts it
off for efficiency, then feeds it to yaml::load in order to get some
metadata. Reading the thing with the whole tail of the recent array
kills the whole idea. The whole thing will not work with JSON.
So we must invent a protocol 2 that works with one additional index
files, say "A", only containing meta.
2011-02-09 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* I think interval guaranteed with the $last_aggregate_call
variable (both in fsck and server) need to be fixed with a $recc
variable to something like 60 seconds or even less.
* minor bug: fsck just added the lockfile to the index which should be
considered bookkeeping.
* speed: a large directory remove that is done by the kernel in 1
seconds triggers minutes of bookkeeping (07:56:42 - 08:01:10 for ~3000
files, all due to Schlemiehl again. Want to do some collecting of
pending ops before actually writing to the RECENT files. Lock!
Repeating the timing with 2600 files and it took 21:28:08 - 21:35:27.
Now having rewritten the loop to use batch_update(): 4383 file removed
21:43:37 - 21:44:12. From 7:30 to 0:35 while doing 60% more work that's
a joy.
* At the moment rrr-init is not needed anymore, rrr-server can be
started and followed by rrr-fsck. Still stupid but not the main
showstopper.
2011-02-05 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* IN_Q_OVERFLOW needs to trigger an fsck, likewise the entry into the
server.
2010-10-26 Andreas J. Koenig <andk@cpan.org>
* forking slave is done, needs more testing.
2010-07-06 Andreas J. Koenig <andk@cpan.org>
* The two next most important goals are to get a useable rrr-server and
a forking slave implementation that uses virtually no memory after the
first pass through. Does it need the status file?
* rrr-init now being fast we can now remove the alpha alerts. Done.
2010-06-16 Andreas J. Koenig <andk@cpan.org>
* rrr-init seems to be sssslllloooowwww. At 3:49 I started it for the
video tree. After twelve minutes the file has reached a size of 500k. It
is locking and rewriting the YAML after every file. Wasn't there an
unlocked variant? For "init" one would not expect locked correctness and
a rewrite after every item. Given that this tends to become slower with
every file it is really unacceptable.
Reminds me of rrr-dirtyupdate (the former name of rrr-update). It seems
the code was not dirty enough and that was the reason why it was so
slow. And rrr-update does not have a --dirty switch, so it looks like we
have no way to force dirty and fast operation yet but we need it for
init.
Irritating the bootstrapping race: the order {(1) fill initial
array, (2) start server} leaves the need for an fsck to cover the time
between 1 and 2. Given that regular fsck is needed in any case the price
is not high but still doesn't give a warm feeling. Maybe starting the
server will by itself do an fsck?
2010-06-15 Andreas J. Koenig <andk@cpan.org>
* remove the wild alpha alerts and say, it is alpha but parts of it are
already working very well or so.
2009-12-10 Andreas J. Koenig <andk@cpan.org>
* Prominent request for statusfile to safe memory consumption. I'd like
to work backwards: get a verification program that verifies how well in
sync two nodes are without using frmr itself. Pretend that the forking
agent already works and can be interrupted with ^C. Then let it die at
random and restart at random and see the memory consumption and the
failure rate over time. Compare it with the curve we have now.
Of course we also invented the status file as a sharp debugging tool.
I'd like to see it in action. See also: F:R:M:Recent::thaw().
2009-06-22 Andreas J. Koenig <andk@cpan.org>
* Todo: rrr-init to generate some index files so that rrr-server can be
started.
2009-05-02 Andreas J. Koenig <andk@cpan.org>
* DONE: rename rrr-dirtyupdate to rrr-update and add an option --dirty
so we can use it for normal update with a single file. And add a cronjob
that runs rrr-fsck so we get a reminder when something is not working
as it should.
2009-04-27 Andreas J. Koenig <andk@cpan.org>
* Todo: I still see more link_stat errors than expected. I come back to
the former suspicion that we do not do necessary bookkeeping on deleted
files so that when we reach the "new" event on a meanwhile deleted file
we try to mirror it although we could know better. It's just noise, no
harm but noise is irritating.
* Todo: more experimenting with runstatusfile to get it official
* Todo: make sure $ENV{LANG}="C" when we call rsync because we will
parse the error.
rsync: link_stat "/authors/id/T/TH/THINC/DateTime-Format-Flexible-0.02.tar.gz" (in PAUSE) failed: No such file or directory
rsync: link_stat "/authors/id/A/AG/AGENT/SSH-Batch-0.001.meta" (in PAUSE) failed: No such file or directory (2)
And that ignore_link_stat_error is propagated in sparse_clone.
DONE
For the record: the bug was that ignore_link_stat_error was lost during
sparse_clone. And then the second bug was that it did not default to
true. Both are now fixed.
2009-04-25 Andreas J. Koenig <andk@cpan.org>
* Todo: fill rrr program with life
2009-04-25 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* Minor bug: I see complaints about files not existing like
/authors/id/G/GW/GWADEJ/SVG-Sparkline-0.2.0.meta or
/authors/id/R/RC/RCAPUTO/POE-1.004.readme
In the RECENT files these are delete events but of course also new
events in older recent files.
I think we do not properly remember deletes when we skip-deletes and so
do not filter them out when we later see the "new" event.
Yes, but that what ignore_link_stat_error is for, we know about this
race condition. We must make ignore_link_stat_error default to true.
DONE
* bug in Done.pm failing to merge two fields into one when a third is
present. FIXED and accompanied with new test.
2009-04-24 Andreas J. Koenig <andk@cpan.org>
* Todo: keep the index clean and run some kind of nondestructive fsck 4
times a day.
* who is our backbone?
http://cpan.cpantesters.org/authors/02STAMP # barbie
http://cpan.solfo.com/authors/02STAMP # abh
(http|ftp)://theoryx5.uwinnipeg.ca/pub/CPAN/ # rkobes
2009-04-17 Andreas J. Koenig <andk@cpan.org>
* the changelog helper I included in the Makefile release memo does not
show tags and is much less useful than I thought. gitk is probably much
more convenient.
2009-04-16 Andreas J. Koenig <andk@cpan.org>
* ABH writes:
#### Sync 1239828608 (1/1/Z) temp .../authors/.FRMRecent-RECENT-Z.yaml-
#### Ydr_.yaml ... DONE
#### Cannot stat '/mirrors/CPAN/authors/.FRMRecent-RECENT-Z.yaml-
#### Ydr_.yaml': No such file or directory at /usr/lib/perl5/site_perl/
#### 5.8.8/File/Rsync/Mirror/Recentfile.pm line 1558.
#### unlink0: /mirrors/CPAN/authors/.FRMRecent-RECENT-Z.yaml-Ydr_.yaml is
#### gone already at cpan-pause.pl line 0
Running without skip-deletes now but cannot reproduce.
2009-04-15 Andreas J. Koenig <andk@cpan.org>
* consider state directory such we can restart after a ^C or come again
from a cronjob.
Reuse _runstatusfile: write atomically, see how we can use the dump to
start running again. Do not leak and remove globs before writing. Do not
only dump one rf, dump the whole complex.
* consider the effect of ^C. Is it safe?
* want to use Perl::Version to up the versions on every release. Only if
things have changed, of course. Does this actually work?
/usr/local/perl-5.10-g/bin/perl-reversion -dryrun
/usr/local/perl-5.10-g/bin/perl-reversion -dryrun -bump lib/File/Rsync/Mirror/Recentfile.pm
Must do the bookkeeping myself when this should happen, maybe based on git?
I think I prefer the same version number for all pm files. But one also
needs a routine for setting them. Ahh:
/usr/local/perl-5.10-g/bin/perl-reversion -current 0.0.4 -set 0.0.5 lib/**/*.pm
NEEDSMOREWORK
* why indexer wrong?
cpan[2]> m /Mirror::Recent/
Module = File::Rsync::Mirror::Recent (ANDK/File-Rsync-Mirror-Recent-0.0.4.tar.bz2)
Module = File::Rsync::Mirror::Recentfile (ANDK/File-Rsync-Mirror-Recent-0.0.2.tar.bz2)
Module = File::Rsync::Mirror::Recentfile::Done (ANDK/File-Rsync-Mirror-Recent-0.0.2.tar.bz2)
Module = File::Rsync::Mirror::Recentfile::FakeBigFloat (ANDK/File-Rsync-Mirror-Recent-0.0.2.tar.bz2)
4 items found
The META.yml was generated by ExtUtils::MakeMaker version 6.5101
The 0.0.2 release has a META.yml by ExtUtils::MakeMaker version 6.42 and without "provides".
I just tried MM 6.5102 and it again produces only a provides for Recent,
not for the other modules.
My own fault. FIXED in the Makefile.PL.
2009-04-13 Andreas J. Koenig <andk@cpan.org>
* Study http://en.wikipedia.org/wiki/Magnet_URI_scheme
* is it true (as stated at
https://fedorahosted.org/InstantMirror/wiki/ExistingRepositoryReplicationMethods)
that rsync can lead to errors when upstream changes before client sync
has completed? Can we see the error when we run this on upstream:
% perl -e '
use Time::HiRes qw(time);
while (){
open my $fh, ">", "changingfile.txt.new" or die;
print $fh (time."\n") x 1000000;
close $fh;
rename "changingfile.txt.new", "changingfile.txt" or die;
}
'
And on the receiving end:
% while true; do
rsync k75:`pwd`/changingfile.txt .; cat changingfile.txt| uniq|wc -l
sleep 1;
done
I cannot get it to fail. Apparently it is sufficient when upstream
always writes atomically (which of course is mandatory)?
SENT to mailing list Apr 28.
* from ABH:
> https://fedorahosted.org/InstantMirror/
> https://www.redhat.com/mailman/listinfo/instantmirror-list
> irc.freenode.net channel #instantmirror
A cool name for a project. Inspires me to write a few sentences about
bittorrent's role in the grand picture.
http://spreadsheets.google.com/pub?key=pGlWX10blP4u2kM05SDtiMg is a
spreadsheet collected by Atul Aggarwal about bittorrent implementations.
2009-04-12 Andreas J. Koenig <andk@cpan.org>
* Interesting last minute bug during real download testing: the output
isn't as pretty anymore, it seems that more work is being done than
needed.
Introducing a highlevel _alluptodate method helped a lot in debugging
this.
FIXED now. Reason was that dirtymark on PAUSE currently is broken; it's
different on 1h file than on the other files. This lead to frequent
calls to _fullseed. Limiting the dirtymark check to $i==0 resolved the
issue.
2009-04-12 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* Todo: try if we can be faster with a native float package. I'm really
glad to have a machine exposing perl floating point bugs, it forced me
to retract this item from the changes file: "several speedups in the
fakebigfloat code" before I get cpan testers fails.
2009-04-11 Andreas J. Koenig <andk@cpan.org>
* Bug: when the dirtymark changes upstream, then the downstream server
notices it immediately and mirrors the "1h" file but then leaves the
rmirror loop and continues with "6h" on the next round through. This
behaviour goes on until it reaches the Z file. Because we eat the Z file
piecemeal we leave the loop after a while but after that everybody seems
to have forgotten that there is some work left to be done. Bad, bad,
bad.
ETOOCONFUSING better name?
Recentfile::get_remote_recentfile_as_tempfile OK
Recentfile::resolve_recentfilename split_rfilename DONE
Recent::_principal_recentfile_object _principal_recentfile_fromremote
Recent::principal_recentfile OK
Recent::_resolve_rfilename _principal_recentfile_fromremote_resosymlink
some void, some not, some not void but called in void context.
2009-04-10 Andreas J. Koenig <andk@cpan.org>
* Bug? When the dirtymark changes then the second tier hosts quickly
reset their DONE state and restart mirroring. But then they mirror
potentially outdated index files with inconsistent dirtymark because the
first tier box may be a bit behind on the large recentfiles.
This means we need a brake when iterating over the recentfiles that
refuses to use a recentfile with the wrong dirtymark.
2009-04-08 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* install the bin/* files and talk about rrr-overview somewhere.
* Ask B. Hansen asks for tempdir accessor such that tempfiles get
created outside the target tree.
* Barbie asks for better logging capabilities
2009-03-29 Andreas J. Koenig <andk@cpan.org>
* known bug: cannot configure the Recentfile objects to keep delete
events. How to call the accessor for that? keep_delete_objects_forever?
Sounds acceptable. FIXED (but untested).
* known bug: keeps temporary index files lying around.
2009-03-24 Andreas J. Koenig <andk@cpan.org>
* Some equivalent for
for ( @{$rrr->recentfiles} ) { $_->verbose(0) }
? DONE
2009-03-22 Andreas J. Koenig <andk@cpan.org>
* k81 is again client of k75 with different parameters.
* broken now: (1) seeding and unseeding: rmirror is seeding and talking
about it all the time and nobody reacts accordingly; (2) lots of temp
files get created and not removed; culprit the new call to
get_remote_recentfile_as_tempfile within Recent.pm; the manpage says the
caller has to remove the tempfile after use.
Need the drawing board.
PARTLY FIXED: retracting the idea to call
get_remote_recentfile_as_tempfile from Recent.pm and moving around seed
and unseed such that uptodate now means "we have mirrored this
recentfile's bunch of files" and seeded means "somebody believes the
index file for this rf needs be refreshed". This seems to work now.
Still collecting temp files that nobody cares to depollute.
2009-03-21 Andreas J. Koenig <andk@cpan.org>
* Bug?: should it be harder than it is atm to set the timestamp to the
future? YES, FIXED
* bug with native integers:
-
epoch: 997872011
path: id/D/DE/DELTA/Crypt-Rijndael_PP-0.03.readme
type: new
-
epoch: 1195248431
path: id/L/LG/LGODDARD/Tk-Wizard-2.124.readme
type: new
Native integer broke when native math was turned off. FIXED
* Bug: something between id/P/PH/PHISH/CGI-XMLApplication-1.1.2.readme
and id/C/CH/CHOGAN/HTML-WWWTheme-1.06.readme. Mirroring the Z file loops
in this area.
Yes, records out of order:
447003 -
447004 epoch: 995885533
447005 path: id/P/PH/PHISH/CGI-XMLApplication_0.9.3.readme
447006 type: new
447007 -
447008 epoch: 995890358
447009 path: id/H/HD/HDIAS/Mail-Cclient-1.3.readme
447010 type: new
447011 -
447012 epoch: 995892221
447013 path: id/H/HD/HDIAS/Mail-Cclient-1.3.tar.gz
447014 type: new
FIXED with sanity check and later with the integer fix.
* Bug: want the index files in a .recent directory
* Bug: lots of dot files are not deleted in time
* possible test case: can a delete change the timestamp? This would
probably break the order of events.
2009-03-20 Andreas J. Koenig <andk@cpan.org>
* 1233701831.34486 what's so special about this number/string? It
belongs to
id/G/GR/GRODITI/MooseX-Emulate-Class-Accessor-Fast-0.00800.tar.gz and
atm lives in Y,Q, and Z.
It is the first entry after id/--skip-locking which has timestamp
1234164228.11325 which represents a file that doesn't exist anymore.
* another bug:
Sync 1237531537 (31547/33111/Z) id/J/JH/JHI/String-Approx-2.7.tar.gz ...
_bigfloatcmp called with l[1237505213.21133]r[UNDEF]: but both must be defined at /home/k/sources/rersyncrecent/lib/File/Rsync/Mirror/Recentfile/FakeBigFloat.pm line 76
File::Rsync::Mirror::Recentfile::FakeBigFloat::_bigfloatcmp(1237505213.21133, undef) called at /home/k/sources/rersyncrecent/lib/File/Rsync/Mirror/Recentfile/FakeBigFloat.pm line 131
File::Rsync::Mirror::Recentfile::FakeBigFloat::_bigfloatlt(1237505213.21133, undef) called at /home/k/sources/rersyncrecent/lib/File/Rsync/Mirror/Recentfile/Done.pm line 110
File::Rsync::Mirror::Recentfile::Done::covered('File::Rsync::Mirror::Recentfile::Done=HASH(0x8857fb4)', 1237505213.21133, 0.123456789) called at /home/k/sources/rersyncrecent/lib/File/Rsync/Mirror/Recentfile.pm line 2041
File::Rsync::Mirror::Recentfile::uptodate('File::Rsync::Mirror::Recentfile=HASH(0x8533a2c)') called at /home/k/sources/rersyncrecent/lib/File/Rsync/Mirror/Recent.pm line 536
File::Rsync::Mirror::Recent::rmirror('File::Rsync::Mirror::Recent=HASH(0x82ef3d0)', 'skip-deletes', 1) called at /home/k/sources/CPAN/GIT/trunk/bin/testing-rmirror.pl line 27
at /home/k/sources/rersyncrecent/lib/File/Rsync/Mirror/Recentfile/FakeBigFloat.pm line 76
File::Rsync::Mirror::Recentfile::FakeBigFloat::_bigfloatcmp(1237505213.21133, undef) called at /home/k/sources/rersyncrecent/lib/File/Rsync/Mirror/Recentfile/FakeBigFloat.pm line 131
File::Rsync::Mirror::Recentfile::FakeBigFloat::_bigfloatlt(1237505213.21133, undef) called at /home/k/sources/rersyncrecent/lib/File/Rsync/Mirror/Recentfile/Done.pm line 110
File::Rsync::Mirror::Recentfile::Done::covered('File::Rsync::Mirror::Recentfile::Done=HASH(0x8857fb4)', 1237505213.21133, 0.123456789) called at /home/k/sources/rersyncrecent/lib/File/Rsync/Mirror/Recentfile.pm line 2041
File::Rsync::Mirror::Recentfile::uptodate('File::Rsync::Mirror::Recentfile=HASH(0x8533a2c)') called at /home/k/sources/rersyncrecent/lib/File/Rsync/Mirror/Recent.pm line 536
File::Rsync::Mirror::Recent::rmirror('File::Rsync::Mirror::Recent=HASH(0x82ef3d0)', 'skip-deletes', 1) called at /home/k/sources/CPAN/GIT/trunk/bin/testing-rmirror.pl line 27
FIXED, it was the "--skip-locking" file where manual intervention was participating
* bug on the mirroring slave: when the dirtymark gets increased we
probably do not reset the done intervals. The mirrorer stays within
tight bounds where it tries to sync with upstream and never seems to
finish. In the debugging state file I see lots of identical intervals
that do not get collapsed. When I restart the mirrorer it dies with:
Sync 1237507989 (227/33111/Z) id/X/XI/XINMING/Catalyst-Plugin-Compress.tar.gz ...
_bigfloatcmp called with l[1237400817.94363]r[UNDEF]: but both must be defined at /home/k/sources/rersyncrecent/lib/File/Rsync/Mirror/Recentfile/FakeBigFloat.pm line 76
File::Rsync::Mirror::Recentfile::FakeBigFloat::_bigfloatcmp(1237400817.94363, undef) called at /home/k/sources/rersyncrecent/lib/File/Rsync/Mirror/Recentfile/FakeBigFloat.pm line 101
File::Rsync::Mirror::Recentfile::FakeBigFloat::_bigfloatge(1237400817.94363, undef) called at /home/k/sources/rersyncrecent/lib/File/Rsync/Mirror/Recentfile/Done.pm line 226
File::Rsync::Mirror::Recentfile::Done::_register_one('File::Rsync::Mirror::Recentfile::Done=HASH(0x84c6af8)', 'HASH(0xb693f2dc)') called at /home/k/sources/rersyncrecent/lib/File/Rsync/Mirror/Recentfile/Done.pm line 200
File::Rsync::Mirror::Recentfile::Done::register('File::Rsync::Mirror::Recentfile::Done=HASH(0x84c6af8)', 'ARRAY(0x8c54bfc)', 'ARRAY(0xb67e618c)') called at /home/k/sources/rersyncrecent/lib/File/Rsync/Mirror/Recentfile.pm line 1044
File::Rsync::Mirror::Recentfile::_mirror_item('File::Rsync::Mirror::Recentfile=HASH(0x84abcb0)', 227, 'ARRAY(0x8c54bfc)', 33110, 'File::Rsync::Mirror::Recentfile::Done=HASH(0x84c6af8)', 'HASH(0x84abd8c)', 'ARRAY(0x839cb64)', 'HASH(0x839c95c)', 'HASH(0xb6a30f0c)', ...) called at /home/k/sources/rersyncrecent/lib/File/Rsync/Mirror/Recentfile.pm line 992
File::Rsync::Mirror::Recentfile::mirror('File::Rsync::Mirror::Recentfile=HASH(0x84abcb0)', 'piecemeal', 1, 'skip-deletes', 1) called at /home/k/sources/rersyncrecent/lib/File/Rsync/Mirror/Recent.pm line 564
File::Rsync::Mirror::Recent::_rmirror_mirror('File::Rsync::Mirror::Recent=HASH(0x84ab6d4)', 7, 'HASH(0x8499488)') called at /home/k/sources/rersyncrecent/lib/File/Rsync/Mirror/Recent.pm line 532
File::Rsync::Mirror::Recent::rmirror('File::Rsync::Mirror::Recent=HASH(0x84ab6d4)', 'skip-deletes', 1) called at /home/k/sources/CPAN/GIT/trunk/bin/testing-rmirror.pl line 27
and debugging stands at
At: before
Brfinterval: Z
Ci: 227
Dre+1:
epoch: 1237400802.5789
path: id/J/JO/JOHND/CHECKSUMS
type: new
Dre-0:
epoch: 1237400807.97514
path: id/M/MI/MIYAGAWA/CHECKSUMS
type: new
Dre-1:
epoch: 1237400817.94363
path: id/X/XI/XINMING/Catalyst-Plugin-Compress.tar.gz
type: new
Eintervals:
-
- 900644040
- 900644040
- []
and it is reproducable.
Why does the mirrorer not fetch a newer Z file? It is 18 hours old while
pause has a fresh one.
FIXED, it was the third anded term in each of the ifs in the IV block in
_register_one: with that we make sure that we do not stamp on valuable
interval data.
2009-03-17 Andreas J. Koenig <andk@cpan.org>
* done: verified the existence of the floating point bug in bleadperl
and verified that switching from YAML::Syck to YAML::XS does not resolve
it.
BTW, the switch was doable with
perl -i~ -pe 's/Syck/XS/g' lib/**/*.pm t/*.t
and should be considered as a separate TODO
* todo: integrate a dirty update with two aggregate calls before
unlocking for frictionless dirtying DONE
* todo: start the second rsync daemon on pause DONE
* todo: move index files to .recent: this cannot simply be done by
setting filenameroot to .recent/RECENT. Other parts of the modules rely
on the fact that dirname(recentfile) is the root of the mirrored tree.
2009-03-16 Andreas J. Koenig <andk@cpan.org>
* What was the resolution of the mirror.pl delete hook bug? Do we call
the delete hook when pause removes a file from MUIR?
* Today on pause: Updating 2a13fba..29f284d and installing it for
/usr/local/perl-5.10.0{,-RC2}
TURUGINA/Set-Intersection-0.01.tar.gz was the last upload before this
action and G/GW/GWILLIAMS/RDF-Query-2.100_01.tar.gz the first after it
2009-03-15 Andreas J. Koenig <andk@cpan.org>
* currently recent_events has the side effect of setting dirtymark
because it forces a read on the file. That should be transparent, so
that the dirtymark call always forces a cache-able(?) read.
* The bug below is -- after a lot of trying -- not reproducible on a
small script, only in the large test script. The closest to the output
below was:
#!perl
use strict;
use Devel::Peek;
my $x = "01237123229.8814";
my($l,$r);
for ($l,$r) {
$_ = "x"x34;
}
($l,$r) = ($1,$2) if $x =~ /(.)(.+)/;
$r = int $r;
$l = "1237123231.22458";
$r = "1237123231.22458";
1 if $l/1.1;
Devel::Peek::Dump $l;
Devel::Peek::Dump $r;
Devel::Peek::Dump $x = $l <=> $r;
die "BROKE" if $x;
__END__
The checked in state at c404a85 fails the test with my
/usr/local/perl-5.10-uld/bin/perl on 64bit but curiously not with
/usr/local/perl-5.10-g/bin/perl. So it seems the behaviour is not even
in the test script always consistent.
* Todo: write a test that inserts a second dirty file with an already
existing timestamp. DONE
* Bug in perl 5.10 on my 64bit box:
DB<98> Devel::Peek::Dump $l
SV = PVMG(0x19e0450) at 0x142a550
REFCNT = 2
FLAGS = (PADMY,NOK,POK,pNOK,pPOK)
IV = 0
NV = 1237123231.22458
PV = 0x194ce70 "1237123231.22458"\0
CUR = 16
LEN = 40
DB<99> Devel::Peek::Dump $r
SV = PVMG(0x19e0240) at 0x142a3e8
REFCNT = 2
FLAGS = (PADMY,POK,pPOK)
IV = 1237123229
NV = 1237123229.8814
PV = 0x19ff900 "1237123231.22458"\0
CUR = 16
LEN = 40
DB<100> Devel::Peek::Dump $l <=> $r
SV = IV(0x19ea6e8) at 0x19ea6f0
REFCNT = 1
FLAGS = (PADTMP,IOK,pIOK)
IV = -1
DB<101> Devel::Peek::Dump $l
SV = PVMG(0x19e0450) at 0x142a550
REFCNT = 2
FLAGS = (PADMY,NOK,POK,pNOK,pPOK)
IV = 0
NV = 1237123231.22458
PV = 0x194ce70 "1237123231.22458"\0
CUR = 16
LEN = 40
DB<102> Devel::Peek::Dump $r
SV = PVMG(0x19e0240) at 0x142a3e8
REFCNT = 2
FLAGS = (PADMY,NOK,POK,pIOK,pNOK,pPOK)
IV = 1237123231
NV = 1237123231.22458
PV = 0x19ff900 "1237123231.22458"\0
CUR = 16
LEN = 40
Retry with uselongdouble gives same effect. Not reproducable on 32bit box (k75).
* Todo: reset "done" or "covered" and "minmax" after a dirty operation? DONE
2009-03-11 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* $obj->merge ($other) needs to learn about equal epoch which may happen
since dirty_epoch intruded.
* Wontfix anytime soon: I think we currently do not support mkdir. Only
files!
2009-01-01 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* Todo: continue working on update(...,$dirty_epoch). It must be
followed by a fast_aggregate! DONE
2008-12-26 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* maybe we need a closest_entry or fitting_interval or something like
that. We want to merge an event into the middle of some recentfile.
First we do not know which file, then we do not know where to lock,
where to enter the new item, when and where to correct the dirtymark.
So my thought is we should first find which file.
Another part of my brain answers: what would happen if we would enter
the new file into the smallest file just like an ordinary new event,
just as an old event?
(1) we would write a duplicate timestamp? No, this would be easy to
avoid
(2) we would make the file large quickly? Yes, but so what? We are
changing the dirtymark, so are willing to disturb the downstream hosts.
2008-11-22 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* 10705 root 17 0 725m 710m 1712 S 0.0 46.8 834:56.05 /home/src/perl/repoperls/installed-perls/perl/pVNtS9N/perl-5.8.0@32642/bin/perl -Ilib /home/k/sources/CPAN/GIT/trunk/bin/testing-rmirror.pl
leak!
https://rt.cpan.org/Ticket/Display.html?id=41199
* bzcat uploads.csv.bz2 | perl -F, -nale '$Seen{$F[-1]}++ and print'
Strangest output being HAKANARDO who managed to upload
Here is a better oneliner that includes also the first line of each
finding:
bzcat uploads.csv.bz2 | perl -MYAML::Syck -F, -nale '$F[-1]=~s/\s+\z//; push @{$Seen{$F[-1]}||=[]},$_; END {for my $k (keys %Seen){ delete $Seen{$k} if @{$Seen{$k}}==1; } print YAML::Syck::Dump(\%Seen)}'
2008-10-31 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* memory leak in the syncher? It currently weighs 100M.
Update 2008-11-02:
root 10705 1.0 4.9 80192 76596 pts/32 S+ Nov02 24:05 /home/src/perl/repoperls/installed-perls/perl/pVNtS9N/perl-5.8.0@32642/bin/perl -Ilib /home/k/sources/CPAN/GIT/trunk/bin/testing-rmirror.pl
2008-10-29 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* lookup by epoch and by path and use this ability on the pause to never
again register a file twice that doesn't need it. Let's call it
contains().
* after the dirtymark is done: fill up recentfiles with fake (historic)
entries; fill up with individual corrections; algorithm maybe to be done
with bigfloat so that we can always place something in the middle
between two entries. Before we must switch to bigfloat we could try to
use Data::Float::nextup to get the.
* Inotify2 on an arbitrary tree and then play with that instead of PAUSE
directly.
* dirtymark now lives in Recentfile, needs to be used in rmirror.
* find out why the downloader died after a couple of hours without a net
connection. Write a test that survives the not-existence of the other
end forever.
2008-10-15 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* reconsider the HTTP epoch only. Not the whole thing over HTTP because
it makes less sense with tight coupling for secondary files. But asking
the server what the current epoch is might be cheaper on HTTP than on
rsync. (Needs to be evaluated)
* remove the 0.00 from the verbose overview in the Merged column in the
Z row. DONE
* write tests that expose the problems of the last few days: cascading
client/server roles, tight coupling for secondary RFs, deletes after
copies.
* Some day we might want to have policy options for the slave:
tight/loose/no coupling with upstream for secondary RFs. tight is what
we have now. loose would wait until a gap occurs that can be closed.
2008-10-14 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* revisit all $rfs->[$i+1] places if they now make sense still
2008-10-11 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* another bug is the fact that the mirror command deletes files before
it unhides the index file, thus confusing downstream slaves. We must not
delete before unhiding and must delete after unhiding. FIXED.
* new complication about the slave that is playing a server role.
Currently we mirror from newest to oldest with a hidden temporary file
as index. And when one file is finished, we unhide the index file.
Imagine the cascading server/slave is dead for a day. It then starts
mirroring again with the freshest thing and unhides the freshest index
file when it has worked through it. In that moment it exposes a time
hole. Because it now works on the second recentfile which is still
hidden.
We currently do nothing special to converge after such a drop out. At
least not intentionally and robustly and thought through.
The algorithm we use to seed the next file needs quite a lot of more
robustness than it currently has. Something to do with looking at the
merged element of the next rf and when it has dropped off, we seed
immediately. And if it ramains dropped off, we seed again, of course.
Nope, looking from smaller to larger RFS we look at the merged element
of this RF and at the minmax/max element of the next RF. If that
$rf[next]->{minmax}{max} >= $rf[this]->{merged}{epoch}, then we can stop
seeding it.
And we need a public accessor seed and unseed or seeded. But not the mix
of public and private stuff that then is used behind the back.
And then the secondary* stuff must go.
And we must understand what the impact is on the DONE system. Can it go
unnoticed that there was a hole? And could the DONE system have decided
the hole is covered? This should be testable with three directories where
the middle stops working for a while. Done->merge is suspicious, we must
stop it from merging non-conflatable neighbors due to broken continuity.
FIXED
2008-10-10 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* Slaven suggests to have the current epoch or the whole current
recentfile available from the HTTP server and take it away with
keepalive. This direction goes the granularity down to subseconds.
We might want to rewrite everything to factor out transport and allow
the whole thing to run via HTTP.
2008-10-09 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* smoker on k81 fetching from k75 to verify cascading works. See
2008-07-17 in upgradexxx and rsync-over-recentfile-3.pl.
* maybe the loop should wait for CHECKSUMS file after every upload. And
CPAN.pm needs to deal with timestamps in the future.
* do not forget the dirtymark!
Text: have a new flag on recentfiles with the meaning: if this
changes, you're required to run a full rsync over all the files. The
reason why we set it would probably be: some foul happened. we injected
files in arbitrary places or didn't inject them although they changed.
The content of the flag? Timestamp? The relation between the
recentfiles would have to be inheritance from the principal, because any
out of band changes would soon later propagate to the next recentfile.
By upping the flag often one can easily ruin the slaves.
last out of band change? dirtymark?
Anyway, this implies that we read a potentially existing recentfile
before we write one.
And it implies that we have an eventloop that keeps us busy in 2-3
cycles, one for current stuff (tight loop) and one for the recentfiles
(cascade when principal has changed), one for the old stuff after a
dirtymark change.
And it implies that the out-of-band change in any of the recentfiles
must have a lock on the principal file and there is the place to set the
dirtymark.
* start a FAQ, especially quick start guide questions. Also to aid those
problematic areas where we have no good solution, like the "links"
option to rsync.
* wish feedback when we are slow.
* reduce mccabe
* Remove a few DEBUG statements.
* The multiple-rrr way of doing things needs a new option to rmirror,
like piecemeal or so. Not urgent because after the first pass through,
things run smoothely. It's only ugly during the first pass.
* I have the suspicion that the code is broken that decides if the
neighboring RF needs to be seeded. I fear when too much time has gone
between two calls (in our case more than one hour), it would not seed
the neighbor. Of course this will never be noticed, so we need a good
test for it.
* local/localroot confusion: I currently pass both options but one must
do.
* accounts for early birds on PAUSE rsync daemon.
* hardcoded 20 seconds
* who mirrors the index? DOING now.
* which CPAN mirrors offer rsync?
* visit all XXX, visit all _float places
* rename the pathdb stuff, it's too confusing. No idea how.
* rrr-inotify, backpan, rrr-register
2008-10-08 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* current bugs: the pathdb seems to get no reset, the seeding of the
secondaryttl stuff seems not to have an effect. Have helped myself with
a rand(10), need to fix this back. So not checked in. Does the rand
thing even help?
The rand thing helps. The secondaryttl stuff was in the wrong line,
fixed now.
The pathdb stuff was because I called either _pathdb or __pathdb on the
wrong object. FIXED now.
* It's not so beautiful if we never fetch the recentfiles that are not
the principal, even if this is correct behaviour. We really do not need
them after we have fetched the whole content.
OK, we want a switch for that: secondaryttl DONE
2008-10-07 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* bug: rrr-news --max does not count correctly. with "35" it shows me 35
lines but with 36 it shows 110. First it repeats 35, gives 70, and then
it lets 40 follow. FIXED
* See that the long running process really only updates the principal
file unless it has missed a timespan during which something happened. If
nothing happened, it must notice even when it misses the timespan. DONE
* we must throw away the pathdb when we have reached the end of Z. From
that moment we can have a very small pathdb because the only reason for
a pathdb is that we know to ignore old records in old files. We won't
need this pathdb again before the next full pass over the data is
necessary and then we will rebuild it as we go along. DONE
2008-10-06 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* I think, Done::register_one is doing wrong in that it does not
conflate neighboring pieces. The covered() method cannot do this because
it has no recent_events array at hand. But register_one has it and could
do it and for some reason misses to do it (sometimes).
This means that the three tests I just wrote can probably not survive
because they test with an already broken Done structure.
The art now is to detect how it happens, then to reproduce, then write a
test, then fix it.
So from the logfile this is what happens: we have a good interval with
newest file being F1 at T1. Now remotely F1 gets a change and F2 goes on
top of it. Locally we now mirror F2 and open a new done interval for it.
Then we mirror F1 but this time with the timestamp T1b. And when we then
try to close the gap, we do not find T1 but instead something older. We
should gladly accept this older piece and this would fix this bug.
FIXED
* bug to fix: when the 1h file changes while rmirror is running, we do
correctly sync the new files but never switch to the 6h file but rather
stay in a rather quick loop that fetches the 1h file again and again.
Is it possible that we initialize a new object? Or does
get_remote_recentfile_as_tempfile overwrite something in myself?
Want a new option: _runstatusfile => $file which frequently dumps the
state of all recentfiles to a file.
FIXED
2008-10-04 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* Todo: now teach update to verify the timestamp is about to write
against the previous and use _increase_a_bit if it doesn't comply with
strict monotony. DONE
* The problem of rounding. So far perl's default precision was
sufficient. One day it won't be. FakeFloat has an easy job when it is
only reading and other machines have written correctly. But when we want
to write a floating point number that is a bit larger than the other
one, then we need our own idea of precision.
Slaven said: just append a "1". This might be going towards the end of
usability too quickly. I'd like something that actually uses the decimal
system. Well, appending a 1 also does this but...
E.g. we have 1.0. nextup on this architecture is starting with
1.0000000000000004. So there is a gap to fill: 1,2,3. Now I have
taken the 1.0000000000000003 and the next user comes and the time tells
him 1.0 again. He has to beat my number without stepping over the
nextup. This is much less space than I had when I chose 1,2,3.
What is also irritating is that nextup is architecture dependent. The
128 bit guy must choose very long numbers to fit in between whereas the
other one with 16 bit uses larger steps. But then the algorithm is the
same for both, so that would be a nice thing.
I see two situation where we need this. One is when Time::HiRes returns
us a value that is <= the last entry in our recentfile. In this case
(let's call it the end-case) we must fill the region between that number
and the next higher native floating point number. The other is when we
inject an old file into an old recentfile (we would then also set a new
dirtymark). We find the integer value already taken and need a slightly
different one (let's call it the middle-case). The difference between
the two situations is that the next user will want to find something
higher than my number in the end-case and something lower than my number
in the middle case.
So I suggest we give the function both a value and an upper bound and it
calculates us a primitive middle. The upper bound in the middle-case is
the next integer. The upper bound on the end-case is the nextup floating
point number. But the latter poses another problem: if we have occupied
the middle m between x and nextup(x), then the nextup(m) will probably
not be the same as nextup(x) because some rounding will take place
before the nextup is calculated and when the rounding reaches the
nextup(x), we will end up at nextup(nextup(x)).
So we really need to consider the nextup and the nextdown from there and
then the middle and that's the number we may approach asymptotically.
Ugly. But DONE.
2008-10-03 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* consider deprecating the use of RECENT.recent as a symlink. It turns
out to need extra hoops with the rsync options and just isn't worth it.
Or maybe these extra hoops are needed anyway for the rest of the tree?
Nope, can't be the case because not all filesystems support symlinks.
But before doing the large step, I'll deprecate the call of
get_remote_recentfile_as_tempfile with an argument. Rememberr this was
only introduced to resolve RECENT.recent and complicates the routine far
beyond what it deserves.
DONE. Won't deprecate RECENT.recent, just moved its handling to the
supervisor.
2008-10-02 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* I think it's a bug that the rsync_option links must be set to true in
order to support RECENT.recent and that nobody cares to set it
automatically. Similar for ignore_link_stat_errors.
2008-09-27 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* Todo: find all todos together and make a plan what is missing for a
release.
- verifytree or something like that. fsck maybe.
- rersyncrecent, the script itself? What it do?
- a way to only mirror the recentfiles without mirroring the whole
remote system such that people can decide to mirror only partially see
also 2008-08-30. .shadow-xxx directory? this also needed for a
filesystem that is still incomplete and might need the mirrorfiles for
lookup(?)
- long living objects that mirror again and again. Inject something
into ta, see how it goes over to tb.
- how do we continue filling up the DONE system when we use an object
for the second time? "fully covered" and "uptodate" or new terminology.
- overview called on the wrong file should be understandable
- the meta data field that must change when we fake something up so that
the downstream people know they have to re-fetch everything.
- how tolerant are we against missing files upstream? how do we keep
track? there are legitimate cases where we did read upstream index right
before a file got deleted there and then find that file as new and want
it. There are other cases that are not self healing and must be tracked
and bugreported.
- how, exactly, do we have to deal with deletes? With rsync errors?
rsync: link_stat "/id/K/KA/KARMAN/Rose-HTMLx-Form-Related-0.07.meta" (in
authors) failed: No such file or directory (2)
The file above is a delete in 1h and a new in file 1M and the
delete in the locally running rmirror did not get propagated to the 1M
object. Bug. And the consequence is a standstill.
It seems that a slave that works with a file below the principal needs
to merge things all the way up to get rid of later deletes. Or keep
track of all deletes and skip them later. So we need a trackdeletes.pm
similar to the done.pm?
see also 2008-08-20 about spurious deletes that really have no add
counterpart and yet they are not wrong.
- consider the effect when resyncing the recentfile takes longer than
the time per loop. Then we never rsync any file. We need to diagnose
that and force an increase of that loop time. But when we later are fast
enough again because the net has recovered, then we need to switch back
to original parameters. ERm, no, it's enough to keep syncing at least
one file before refetching an index file.
- remember to verify that no temp files are left lying around and the
signal handler
- status file for not long running jobs that want to track upstream with
a, say, cronjob.
- revisit all XXX _float areas and study Sub::Exporter DONE
- persistent DB even though we just said we do not need it. Just for
extended capabilities and time savings when, for example, upstream
announces a reset and we get new recentfiles and could then limit
ourselves to a subset of files (those that have a changed epoch) in a
first pass and would only then do the loop to verify the rest. Or
something.
* Todo: aggregate files should know their feed and finding the principal
should be done stepwise. (?)
* Todo: DESTROY thing that unlocks. Today when I left the debuggerr I
left locks around. DONE
2008-09-26 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* maybe extend the _overview so that it always says if and where the
last file is in the next file and where the next event in the next rf
would lie. No, don't like this anymore. REJECT
* take the two new redundant tests out again, only the third must
survive. DONE
* Todo: add a sanity check if the merged structure is really pointing to
a different rf and that this different rf is larger. DONE
2008-09-25 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* now test, if they are overlapping. And test if there is a file in the
next rf that would fit into this rf's interval.
1h 1222324012.8474 1222322541.7963 0.4086
6h 1222320411.2760 1222304207.6931 4.5010 missing overlap/gap!
1d 1222320411.2760 1222238750.5071 22.6835 large overlap
1W 1222313218.3626 1221708477.5829 167.9835
I suspect that somebody writes a merged timestamp without having merged
and then somebody else relies on it.
If aggregate is running, the intervals must not be extravagated, if it
is not running, there must not be bounds, the total number of events in
the system must be counted and must be controlled throughout the tests.
That the test required the additional update was probably nonsense,
because aggregate can cut pieces too. FIXED & DONE
2008-09-23 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* rrr-aggregate seems to rewrite the RECENT file even if nothing has
changed. FIXED
2008-09-21 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* Most apparent bug at the moment is that the recentfiles are fetched
too often. Only the principal should be fetched and if it has not
changed, the others should not be refetched. ATM I must admit that I'm
happy that we refetch more often than needed because I can more easily
fix bugs while the thing is running.
* Let's say, 1220474966.19501 is a timestamp of a file that is already
done but the done system does not know about it. The reason for the
failure is not known and we never reach the status uptodate because of
this. We must get over it.
Later it turns out that the origin server had a bug somewhere.
1220474966.19042 came after 1220474966.19501. Or better: it was in the
array of the recentfile one position above. The bug was my own.
2008-09-20 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* There is the race condition where the server does a delete and the
slave does not yet know and then tries to download it because he sees
the new. So for this time window we must be more tolerant against
failure. If we cannot download a file, we should just skip it and should
not retry immediately. The whole system should discover the lost thing
later. Keeping track with the DONE system should really be a no brainer.
But there is something more: the whole filesystem is a database and the
recentfiles are one possible representation of it. It's a pretty useful
representation I think that's why I have implemented something around
it. But for strictly local operation it has little value. For local
operation we would much rather have a database. So we would enter every
recentfile reading and every rsync operation and for every file the last
state change and what it leads to. Then we would always ignore older
records without the efforts involved with recentfiles.
The database would have: path,recentepoch,rsyncedon,deletedon
Oh well, not yet clear where this leads to.
2008-09-19 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* Bug: the bigloop ran into a funny endless loop after EWILHELM uploaded
Module-Build. It *only* rsynced the "1h" recentfile from that moment on.
* statusfile, maybe only on demand, alone to have a sharp debugging
tool. It is locked and all recentfiles dump themselves into it and we
can build a viewer that lets us know where we stand and what's inside.
* remember: only the principal recentfile needs expiration, all others
shall be expired by principal if it discovers that something has move
upstream.
2008-09-18 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* Always check if we stringify to a higher value than in the entry
before. DONE
* And in covered make an additional check if we would be able to see a
numerical difference between the two numbers and if we can't then switch
to a different, more expensive algorithm. Do not want to be caught by
floating surprises. DONE
2008-09-17 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* caching has several aspects here: we can cache the interval of the
recentfile which only will change when the mtime of the file changes. We
must re-mirror the recentfile when its ttl has expired. Does have_read
tell you anything? It counts nothing at all. Only the mtime is
interesting. The ntuple mtime, low-epoch, high-epoch. And as a separate
thing the have_mirrored because it is unrelated to the mtime.
* Robustness of floating point calculations! I always thought that the
string calculated by the origin server for the floating representation
of the epoch time is just a string. When we convert it to a number and
later back to a string, the other computer might come to a different
conclusion. This must not happen, we want to preserve it under any
circumstances. I will have to write tests with overlong sequences that
get lost in arithmetic and must see if all still works well. DONE
But one fragile point remains: if one host considers a>b and the other
one considers them == but no eq. To prevent this, we must probably do
some extra homework. DONE
2008-09-16 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* the concept of tracking DONE needs an object per recentfile that has
something like these methods:
do_we_have(xxx), we_have(xxx), do_we_have_all(xxx,yyy), reset()
covered() register() covered()
The unclear thing is how we translate points in time into intervals. We
could pass a reference to the current recent_events array when running
we_have(xxx) and let the DONE object iterate over it such that it only
has to store a list of intervals that can melt into each other. Ah, even
passing the list together with a list of indexes seems feasiable.
Or maybe ask for the inverted list?
Whenever the complete array is covered by the interval we say we are
fully covered and if the recentfile is not expired, we are uptodate.
2008-09-07 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
2008-09-05 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* need a way to "return" the next entry after the end of a list. When
the caller says "before" or "after" we would like to know if he could
cover that interval/threshold or not because this influences the effect
of a newer timestamp of that recentfile. DONE with $opt{info}.
2008-09-04 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* one of the next things to tackle: the equivalent of csync2 -TIXU.
loop implies tixu (?). Nope, something like --statefile decides. Per
default we do ...?
T test, I init, X including removals, U nodirtymark
So we have no concept of dirtymarks, we only trust that since we are
running we have observed everything steadily. But people will not let
this program run forever so we must consider both startup penalty and
book keeping for later runs. We keep this for later. For now we write a
long running mirror that merges several intervals.
2008-09-02 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* need to speed up the 02 test, it's not clever to sleep so much. Reduce
the intervals!
* rersyncrecent, the script: default to one week. The name of the switch
is --after. Other switches? --loop!
2008-08-30 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* need a switch --skip-deletes (?)
* need a switch --enduser that tells us that the whole tempfile
discipline is not needed when there is no downstream user. (?)
Without this switch we cannot have a reasonable recent.pl that just
displays the recent additions. Either we accept to download everything.
Or we download temporary files without the typical rsync protocol
advantages.
Or maybe the switch is --tmpdir? If --tmpdir would mean: do not use
File::Temp::tempdir, this might be a win.
2008-08-29 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* apropos missing: we have no push, we never know the downstream
servers. People who know their downstream hosts and want to ascertain
something will want additional methods we have never thought about, like
update or delete a certain file.
2008-08-26 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* tempted to refactor rmirror into resolve_symlink, localize, etc.
Curious if rsync_options=links equal 0 vs. 1 will make the expected
difference.
* rsync options: it's a bit of a pain that we usually need several rsync
options, like compress, links, times, checksum and that there is no
reasonable default except the original rsync default. I think wee can
safely assume that the rsync options are shared between all recentfile
instances within one recent tree.
2008-08-20 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* deletes: if a delete follows an add quickly enough it may happen that
a downstream mirror did not see the add at all! It seems this needs to
be mentioned somewhere. The point here is that even if the downstream is
never missing the principal timeframe it may encounter a "delete" that
has no complimentary "add" anywhere.
2008-08-19 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* I suspect the treat of metadata is incorrect during read or something.
The bug that I am watching is that between 06:08 and 06:09 the 6h file
contained more than 6 hours worth of data. At 06:08 we merged into the
1d file. We need to take snapshots of the 6h file over the course of an
hour or maybe only between XX:08 and XX:09? Nope, the latter is not
enough.
Much worse: watching the 1h file: right at the moment (at 06:35) it
covers 1218867584-1219120397 which is 70 hours.
Something terribly broken. BTW, 1218867584 corresponds to Sat Aug 16
08:19:44 2008, that is when I checked out last time, so it seems to be
aggregating and never truncating?
No, correct is: it is never truncating; but wrong is: it is aggregating.
It does receive a lot of events from time to time from a larger file.
Somehow a large file gets merged into the small one and because the
"meta/merged" attribute is missing, nobody is paying attention. I
believe that I can fix this by making sure that metadata are honoured
during read. DONE and test adjusted.
2008-08-17 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* grand renaming plan
remotebase => remoteroot to fit well with localroot DONE
local_path() => localroot seems to me should already work DONE
recentfile_basename => rfilename no need to stress it has no slash DONE
filenameroot??? Doesn't seem too bad to me today. Maybe something like
kern? It would anyway need a deprecation cycle because it is an
important constructor.
* I like the portability that Data::Serializer brings us but the price
is that some day we might find out that it is slowing us a bit. We'll
see.
2008-08-16 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* should we not enter the interval of the principal (or the interval of
the merging file?) in every aggregated/merged file?
* we should aim at a first release and give up on thinking about
sanitizing stuff and zloop. Let's just admit that a full traditional
rsync is the only available sanitizer ATM. Otherwise it's complicated
stuff: sanitizing on the origin server, sanitizing on the slaves,
sanitizing forgotten files, broken timestamps, etc. Let's delay it and
get the basics out before this becomes a major cause for mess.
2008-08-13 Andreas Koenig <k@andreas-koenigs-computer.local>
* On OSes not supporting symlinks we expect that RECENT.recent contains
the contents of the principal recentfile. Actually this is identical on
systems supporting symlinks. Simple, what follows from that is that we
need to keep the serializer in the metadata because we cannot read it
from the filename, doesn't it? Of course not. It's a chicken and egg
problem. This leaves us with the problem to actually parse the
serialized data to find out in which format it is. So who can do the 4
or 5 magics we wanted to support? File::LibMagic?
2008-08-09 Andreas Koenig <k@andreas-koenigs-computer.local>
* remotebase and recentfile_basename are ugly names. Now that we need a
word for the shortest/principal/driving recentfile too we should do
something about it.
localroot is good. rfile is good. local_path() is bad, local_path($path)
is medium, filenameroot() is bad, remotebase is bad, recentfile is
already deprecated.
Up to now remotebase was the string that described the remote root
directory in rsync notation, like pause.perl.org::authors. And
recentfile_basename was "RECENT-1h.yaml".
2008-08-08 Andreas Koenig <k@andreas-koenigs-computer.local>
* The test that was added in today's checkin is a good start for a test
of rmirror. We should have more methods in Recent.pm: verify,
addmissingfiles. We should verify the current tree, then rmirror it and
then verifytree the copy. We could then add some arbitrary file and let
it be discovered by addmissingfiles, then rmirror again and then
verifytree the copy again.
Then we could start stealing from csync2 sqlite database [no port to
OSX!] and fill a local DB. And methods to compare the database with the
recentfiles. Our strength is that in principle we could maintain state
with a single float. We have synced up to 1234567890.123456. If the Z
file does not add new files all we have to do is mirror the new ones and
delete the goners.
This makes it clear that we should extend current protocol and declare
that we cheat when we add files too late, just to help the other end
keeping track. Ah yes, that's what was meant when zloop was mentioned
earlier.
Maybe need to revisit File::Mirror to help me with this task.
2008-08-07 Andreas Koenig <k@andreas-koenigs-computer.local>
* There must be an allow-me-to-truncate flag in every recentfile.
Without it one could construct a sequence of updates winning the locking
battle against the aggregator. Only if an aggregator has managed to
merge data over to the next level, truncating can be allowed. DONE with
accessor merged.
2008-08-06 Andreas Koenig <k@andreas-koenigs-computer.local>
* We should probably guarantee that no duplicates enter the aggregator
array.
2008-08-02 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* To get merge operation faster would need a good benchmark test. What
02 spits out isn't reliable enough and is dominated by many other
things. Between
commit 10176bf6b79865d4fe9f46e3857a3b8669fa7961
Author: Andreas J. Koenig <k@k75.(none)>
Date: Sat Aug 2 07:58:04 2008 +0200
and
commit 3243120a0c120aaddcd9b1f4db6689ff12ed2523
Author: Andreas J. Koenig <k@k75.(none)>
Date: Sat Aug 2 11:40:29 2008 +0200
there was a lot of trying but the effect is hardly measurable with
current tests.
* overhead of connecting seems high. When setting
max_files_per_connection to 1 we see that.
2008-08-01 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* 1217622571.0889 - 1217597432.86734 = 25138.2215600014
25138.2215600014/3600 = 6.98283932222261
It jumps into the eye that this is ~ 7 hours, not ~6, so there seems to
be a bug in the aggregator. FIXED
2008-07-27 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* e.g. id/Y/YE/YEWENBIN/Emacs-PDE-0.2.16.tar.gz: Do we have it, should
we have it, can we mirror it, mirror it!
I fear this needs a new class which might be called
File::Rsync::Mirror::Recent. It would collect all recentfiles of a kind
and treat them as an entity. I realize that a single recentfile may be
sufficient for certain tasks and that it is handy for the low level
programmer but it is not nice to use. If there is a delete in the 1h
file then the 6h file still contains it. Seekers of the best information
need to combine at least some of the recentfiles most of the time.
There is the place for the Z loop!
But the combination is something to collect in a database, isn't it. Did
csync2 just harrumph?
2008-07-26 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* it just occurred to me that hosts in the same mirroring pool could
help out each other even without rewriting the recentfile. Just fetch
the stuff to mirror from several places, bingo. But that's something
that should rather live in a separate package or in rsync directly.
* cronjobs are unsuited because with ntp they would all come at the full
minute and disturb each other. Besides that I'd hate to have a backbone
with more than a few seconds latency.
2008-07-25 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* a second rsync server with access control for PAUSE. Port? 873 is the
standard port, let's take 8873.
* if there were a filesystem based on this, it would have a slow access
to inexistent files. It would probably provide wrong readdir (only based
on current content) or also a slow one (based on a recentfile written
after the call). But it would provide fast access to existing files. Or
one would deliberately allow slightly blurred answers based on some
sqlite reflection of the recentfiles.
* todo: write a variant of mirror() that combines two or more
recentfiles and treats them like one
* todo: signal handler to remove the tempfile
2008-07-24 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* now that we have the symlink I forgot how it should be used in
practice.
* the z loop: add missing files to Z file. Just append them (instead of
prepending). So one guy prepends something from the Y file from time to
time and another guy appends something rather frequently. Collecting
pond. When Y merges into Z, things get epoch and the collecting pond
gets smaller. What exactly are "missing files"?
take note of current epoch of the alpha file, let's call it the
recent-ts
find all files on disk
remove all files registered in the recentworld up to recent-ts
remove all files that have been deleted after recent-ts according to
recentworld
2008-07-23 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* rersyncrecent might be a cronjob with a (locked) state file which
contains things like after and maybe last z sync or such?
rrr-mirror might be an alternative name but how would we justify the
three Rs when there is no Re-Rsync-Recent?
With the --loop parameter it is an endless loop, without it is no loop.
At least this is simple.
* todo: new accssor z-interval specifies how often the Z file is updated
against the filesystem. We probably want no epoch stamp on these
entries. And we want to be able to filter the entries (e.g. no
by-modules and by-category tree)
2008-07-20 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* Fill the Z file. gc or fsck or both. Somehow we must get the old files
into Z. We do not need the other files filled up with filesystem
contents though.
* need interface to query for a file in order to NOT call update on
PAUSE a second time within a short time.
2008-07-19 Andreas J. Koenig <andreas.koenig.7os6VVqR@franz.ak.mind.de>
* recommended update interval? Makes no sense, is different for
different users.
* Moosify
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