[Bitcoin-development] Ultraprune merged in mainline

Arklan Uth Oslin arklan.uthoslin at gmail.com
Sun Oct 21 01:38:23 UTC 2012


i can happily start testing this this weekend. however i'm not 100% sure
how to get a copy. i looked around github, but wasn't sure which was the
proper project. could i get a link and a simple "do this, this and this"?
thanks.

i feel like a newb. ugh.

Arklan

----------
As long as there is light, the darkness holds no fear. And yet, even in the
deepest black, there is life. - Arklan Uth Oslin

I want to leave this world the same way I came into it: backwards and on
fire. - Arklan Uth Oslin



On Sat, Oct 20, 2012 at 4:33 PM, Pieter Wuille <pieter.wuille at gmail.com>wrote:

> Hello everyone,
>
> I've just merged my "ultraprune" branch into mainline (including
> Mike's LevelDB work). This is a very significant change, and all
> testing is certainly welcome. As a result of this, many pull requests
> probably don't apply cleanly anymore. If you need help rebasing them
> on the new structure, ask me.
>
> The idea behind ultraprune is to use an ultra-pruned copy (only
> unspent transaction outputs in a custom compact format) of the block
> chain for validation (as opposed to a transaction index into the block
> chain). It still keeps all blocks around for serving them to other
> nodes, for rescanning, and for reorganisations. As such, it is still a
> full node. So, despite the name, it does not implement any actual
> pruning yet, though pruning would be trivial to implement now. This
> would have profound effects on the network though, so may still need
> some discussion first.
>
> A small summary of the changes:
>  * Instead of blk000?.dat, we have blocks/blk000??.dat files of max
> 128 MiB, pre-allocated per 16 MiB
>  * Instead of a Berklely DB blkindex.dat, we have a LevelDB directory
> blktree/. This only contains a block index, no transaction index.
>  * A new LevelDB directory coins/, which contains data about the
> current unspent transaction output set.
>  * New files blocks/rev000??.dat contain undo data for blocks
> (necessary for reorganisation).
>  * More information is kept about blocks and block files, so
> facilitate pruning in the future, and to prepare for a headers-first
> mode.
>  * Two new RPC calls are added: gettxout and gettxoutsetinfo.
>
> The most noticeable change should be performance: LevelDB deals much
> better with slow I/O than BDB does, and the working set size for
> validation is an order of magnitude smaller. In the longer run, I
> think it is an evolution towards separation between validation nodes
> and archive nodes, which is needed in my opinion.
>
> --
> Pieter
>
>
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