From: Pieter Wuille <pieter.wuille@gmail•com>
To: Olaoluwa Osuntokun <laolu32@gmail•com>,
Bitcoin Dev <bitcoin-dev@lists•linuxfoundation.org>
Subject: Re: [bitcoin-dev] BIP 158 Flexibility and Filter Size
Date: Fri, 18 May 2018 20:06:10 -0700 [thread overview]
Message-ID: <CAPg+sBhL8ZV+kswgyQfQyhd0Qv5Mkt1cYxrfFV4H32s9QYLo0A@mail.gmail.com> (raw)
In-Reply-To: <CAO3Pvs8DaphZjZUp8_Og+SMmYrrgFi3HyWTZb5J1mGVEcmkn8A@mail.gmail.com>
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On Fri, May 18, 2018, 19:57 Olaoluwa Osuntokun via bitcoin-dev <
bitcoin-dev@lists•linuxfoundation.org> wrote:
> Greg wrote:
> > What about also making input prevouts filter based on the scriptpubkey
> being
> > _spent_? Layering wise in the processing it's a bit ugly, but if you
> > validated the block you have the data needed.
>
> AFAICT, this would mean that in order for a new node to catch up the filter
> index (index all historical blocks), they'd either need to: build up a
> utxo-set in memory during indexing, or would require a txindex in order to
> look up the prev out's script. The first option increases the memory load
> during indexing, and the second requires nodes to have a transaction index
> (and would also add considerable I/O load). When proceeding from tip, this
> doesn't add any additional load assuming that your synchronously index the
> block as you validate it, otherwise the utxo set will already have been
> updated (the spent scripts removed).
>
I was wondering about that too, but it turns out that isn't necessary. At
least in Bitcoin Core, all the data needed for such a filter is in the
block + undo files (the latter contain the scriptPubKeys of the outputs
being spent).
I have a script running to compare the filter sizes assuming the regular
> filter switches to include the prev out's script rather than the prev
> outpoint itself. The script hasn't yet finished (due to the increased I/O
> load to look up the scripts when indexing), but I'll report back once it's
> finished.
>
That's very helpful, thank you.
Cheers,
--
Pieter
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next prev parent reply other threads:[~2018-05-19 3:06 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-17 15:25 Matt Corallo
2018-05-17 15:43 ` Peter Todd
2018-05-17 15:46 ` Matt Corallo
2018-05-17 16:36 ` Gregory Maxwell
2018-05-17 16:59 ` Matt Corallo
2018-05-17 18:34 ` Gregory Maxwell
2018-05-17 18:34 ` Gregory Maxwell
2018-05-17 20:19 ` Jim Posen
2018-05-17 20:45 ` Gregory Maxwell
2018-05-17 21:27 ` Jim Posen
2018-05-19 3:12 ` Olaoluwa Osuntokun
2018-05-21 8:35 ` Johan Torås Halseth
2018-05-22 1:16 ` Olaoluwa Osuntokun
2018-05-22 9:23 ` Johan Torås Halseth
2018-05-23 0:42 ` Jim Posen
2018-05-23 7:38 ` Jim Posen
2018-05-23 8:16 ` Johan Torås Halseth
2018-05-23 17:28 ` Gregory Maxwell
2018-05-24 1:04 ` Conner Fromknecht
2018-05-24 3:48 ` Jim Posen
2018-05-28 18:18 ` Tamas Blummer
2018-05-28 18:28 ` Tamas Blummer
2018-05-28 19:24 ` Gregory Maxwell
2018-05-29 2:42 ` Jim Posen
2018-05-29 3:24 ` Gregory Maxwell
2018-05-29 4:01 ` Olaoluwa Osuntokun
2018-05-31 14:27 ` Tamas Blummer
2018-06-01 2:52 ` Olaoluwa Osuntokun
2018-06-01 4:15 ` Gregory Maxwell
[not found] ` <CAAS2fgSyVi0d_ixp-auRPPzPfFeffN=hsWhWT5=EzDO3O+Ue1g@mail.gmail.com>
2018-06-02 0:01 ` Olaoluwa Osuntokun
2018-06-02 0:22 ` Gregory Maxwell
2018-06-02 2:02 ` Jim Posen
2018-06-02 12:41 ` David A. Harding
2018-06-02 22:02 ` Tamas Blummer
2018-06-03 0:28 ` Gregory Maxwell
2018-06-03 5:14 ` Tamas Blummer
2018-06-03 6:11 ` Pieter Wuille
2018-06-03 16:44 ` Tamas Blummer
2018-06-03 16:50 ` Tamas Blummer
2018-06-08 5:03 ` Olaoluwa Osuntokun
2018-06-08 16:14 ` Gregory Maxwell
2018-06-08 23:35 ` Olaoluwa Osuntokun
2018-06-09 10:34 ` David A. Harding
2018-06-12 23:51 ` Olaoluwa Osuntokun
2018-06-09 15:45 ` Gregory Maxwell
2018-06-12 23:58 ` Olaoluwa Osuntokun
2018-05-18 8:46 ` Riccardo Casatta
2018-05-19 3:08 ` Olaoluwa Osuntokun
2018-05-19 2:57 ` Olaoluwa Osuntokun
2018-05-19 3:06 ` Pieter Wuille [this message]
2018-05-22 1:15 ` Olaoluwa Osuntokun
2018-05-18 6:28 ` Karl-Johan Alm
2018-06-04 8:42 ` Riccardo Casatta
2018-06-05 1:08 ` Jim Posen
2018-06-05 4:33 ` Karl-Johan Alm
2018-06-05 17:22 ` Jim Posen
2018-06-05 17:52 ` Gregory Maxwell
2018-06-06 1:12 ` Olaoluwa Osuntokun
2018-06-06 15:14 ` Riccardo Casatta
2018-05-19 2:51 ` Olaoluwa Osuntokun
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