Re: [bitcoin-dev] Draft BIP : fixed-schedule block size increase

From: Patrick Strateman <patrick.strateman@gmail•com>
To: bitcoin-dev@lists•linuxfoundation.org
Subject: Re: [bitcoin-dev] Draft BIP : fixed-schedule block size increase
Date: Mon, 22 Jun 2015 14:39:07 -0700	[thread overview]
Message-ID: <5588807B.7030400@gmail.com> (raw)
In-Reply-To: <CABsx9T2FxNEEUx7_ZRf2NpQk1fdqMKtfzccX-duBjOn-ksS0cg@mail.gmail.com>

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If you truly have a consensus then the rational behavior is to
permanently change the nodes behavior after the trigger.

On 06/22/2015 02:21 PM, Gavin Andresen wrote:
> On Mon, Jun 22, 2015 at 4:54 PM, Peter Todd <pete@petertodd•org
> <mailto:pete@petertodd•org>> wrote:
>
>     > Since it's possible that block timestamps aren't chronological
>     in order, what would happen if a block following a size increase
>     trigger is back in the past before the size increase? Would that
>     block have a lower size restriction again? Would using block
>     height not be a more stable number to work with?
>
>     In the nVersion bits proposal that I co-authored we solved that
>     issue by
>     comparing the timestamp against the median time, which is
>     guaranteed by
>     the protocol rules to monotonically advance.
>
>
> That complicates the implementation quite a bit.
>
> I mostly implemented a variant that replaced the MAX_BLOCK_SIZE
> constant with a function that took both a timestamp and a block
> height, and there are several places in the current reference
> implementation where digging out the block height (or, worse,
> calculating the median timestamp for the block) would involve changing
> quite a few functions in the call-chain or acquiring the cs_main lock
> to consult the current best chain.
>
> -- 
> --
> Gavin Andresen
>
>
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