Hi,
Is this code available to process the 7zip data on the fly? I had heard a
rumour before that 7zip required multiple passes to decompress.
cheers,
Jamie
----- Original Message -----
From: Lev Muchnik <levmuchnik(a)gmail.com>
Date: Tuesday, March 16, 2010 1:55 pm
Subject: Re: [Xmldatadumps-admin-l] 2010-03-11 01:10:08: enwiki
Checksumming pages-meta-history.xml.bz2 :D
To: Tomasz Finc <tfinc(a)wikimedia.org>
Cc: Wikimedia developers <wikitech-l(a)lists.wikimedia.org>rg>,
xmldatadumps-admin-l(a)lists.wikimedia.org,
Xmldatadumps-l(a)lists.wikimedia.org
I am entirely for 7z. In fact, once released,
I'll be able to
test the XML
integrity right away - I process the data on the fly,
without unpacking it
first.
On Tue, Mar 16, 2010 at 4:45 PM, Tomasz Finc
<tfinc(a)wikimedia.org> wrote:
Kevin Webb wrote:
> I just managed to finish decompression. That took about 54
hours on an
> EC2 2.5x unit CPU. The final data size is
5469GB.
> As the process just finished I
haven't been able to check the
> integrity of the XML, however, the bzip stream itself
appears to be
> good.
> As was mentioned previously, it would
be great if you could
compress> > future archives using pbzib to allow for
parallel
decompression. As I
understand it, the pbzip files are reverse compatible with all
existing bzip2 utilities.
Looks like the trade off is slightly larger files due to pbzip2's
algorithm for individual chunking. We'd have to change the
buildFilters function in
http://tinyurl.com/yjun6n5 and
install the new
binary. Ubuntu already has it in 8.04 LTS making
it easy.
Any takers for the change?
I'd also like to gauge everyones opinion on moving away from
the large
file sizes of bz2 and going exclusively 7z.
We'd save a huge
amount of
space doing it at a slightly larger cost during
compression.
Decompression of 7z these days is wicked fast.
let know
--tomasz
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