From: Wladimir <laanwj@gmail•com>
To: Mike Hearn <mike@plan99•net>
Cc: Bitcoin Dev <bitcoin-development@lists•sourceforge.net>
Subject: Re: [Bitcoin-development] Chain pruning
Date: Thu, 10 Apr 2014 13:57:00 +0200 [thread overview]
Message-ID: <CA+s+GJDbYjwhpsV15a+7kCO_vTstEewVrwvqbnB=a5zOSwFC6Q@mail.gmail.com> (raw)
In-Reply-To: <CANEZrP04O7EqB=TqyTiC7O1K2A9R0nKJ_ssANHKg=Byum8-LtA@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 1419 bytes --]
On Thu, Apr 10, 2014 at 1:37 PM, Mike Hearn <mike@plan99•net> wrote:
> Chain pruning is probably a separate thread, changing subject.
>
>
>> Reason is that the actual blocks available are likely to change
>> frequently (if
>> you keep the last week of blocks
>
>
> I doubt anyone would specify blocks to keep in terms of time. More likely
> it'd be in terms of megabytes, as that's the actual resource constraint on
> nodes.
>
Well with bitcoin, (average) time, number of blocks and (maximum) size are
all related to each other so it doesn't matter how it is specified, it's
always possible to give estimates of all three.
As for implementation it indeed makes most sense to work with block ranges.
> Given a block size average it's easy to go from megabytes to num_blocks,
> so I had imagined it'd be a new addr field that specifies how many blocks
> from the chain head are stored. Then you'd connect to some nodes and if
> they indicate their chain head - num_blocks_stored is higher than your
> current chain height, you'd do a getaddr and go looking for nodes that are
> storing far enough back.
>
This assumes that nodes will always be storing the latest blocks. For
dynamic nodes that take part in the consensus this makes sense.
Just wondering: Would there be a use for a [static] node that, say, always
serves only the first 100000 blocks? Or, even, a static range like block
100000 - 200000?
Wladimir
[-- Attachment #2: Type: text/html, Size: 2296 bytes --]
next prev parent reply other threads:[~2014-04-10 11:57 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-10 11:37 Mike Hearn
2014-04-10 11:57 ` Wladimir [this message]
2014-04-10 12:10 ` Gregory Maxwell
2014-04-10 14:19 ` Wladimir
2014-04-10 16:23 ` Brian Hoffman
2014-04-10 16:28 ` Mike Hearn
2014-04-10 16:47 ` Brian Hoffman
2014-04-10 16:54 ` Ricardo Filipe
2014-04-10 16:56 ` Brian Hoffman
2014-04-10 16:59 ` Pieter Wuille
2014-04-10 17:06 ` Brian Hoffman
2014-04-10 18:19 ` Paul Rabahy
2014-04-10 18:32 ` Pieter Wuille
2014-04-10 20:12 ` Tier Nolan
2014-04-10 20:29 ` Pieter Wuille
2014-04-10 19:36 ` Mark Friedenbach
2014-04-10 21:34 ` Jesus Cea
2014-04-10 22:15 ` Mark Friedenbach
2014-04-10 22:24 ` Jesus Cea
2014-04-10 22:33 ` Gregory Maxwell
2014-04-10 16:52 ` Ricardo Filipe
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CA+s+GJDbYjwhpsV15a+7kCO_vTstEewVrwvqbnB=a5zOSwFC6Q@mail.gmail.com' \
--to=laanwj@gmail$(echo .)com \
--cc=bitcoin-development@lists$(echo .)sourceforge.net \
--cc=mike@plan99$(echo .)net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox