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To: Mike Hearn <mike@plan99.net>
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Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Warning: many 0.7 nodes break on large
	number of tx/block; fork risk
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Yes, 0.7 (yes 0.7!) was not sufficiently tested it had an undocumented =
and unknown criteria for block rejection, hence the upgrade went wrong.

More space in the block is needed indeed, but the real problem you are =
describing is actually not missing space in the block, but proper =
handling of mem-pool transactions. They should be pruned on two =
criteria:

1. if they gets to old >24hr
2. if the client is running out of space, then the oldest should =
probably be pruned=20

clients are anyway keeping, and re-relaying, their own transactions and =
hence it would mean only little, and only little for clients. Dropping =
free / old transaction is a much a better behavior than dying... Even a =
scheme where the client dropped all or random mempool txes would be a =
tolerable way of handling things (dropping all is similar to a restart, =
except for no user intervention).

Following that, increase the soft and hard limit to 1 and eg 10MB, but =
miners should be the last to upgrade.

/M


On 12/03/2013, at 10:10, Mike Hearn <mike@plan99.net> wrote:

> Just so we're all on the same page, can someone confirm my
> understanding  - are any of the following statements untrue?
>=20
> BDB ran out of locks.
> However, only on some 0.7 nodes. Others, perhaps nodes using different
> flags, managed it.
> We have processed 1mb sized blocks on the testnet.
> Therefore it isn't presently clear why that particular block caused
> lock exhaustion when other larger blocks have not.
>=20
> The reason for increasing the soft limit is still present (we have run
> out of space).
> Therefore transactions are likely to start stacking up in the memory
> pool again very shortly, as they did last week.
> There are no bounds on the memory pool size. If too many transactions
> enter the pool then nodes will start to die with OOM failures.
> Therefore it is possible that we have a very limited amount of time
> until nodes start dying en-masse.
> Even if nodes do not die, users have no way to find out what the
> current highest fees/bids for block space are, nor any way to change
> the fee on sent transactions.
> Therefore Bitcoin will shortly start to break for the majority of
> users who don't have a deep understanding of the system.
>=20
>=20
> If all the above statements are true, we appear to be painted into a
> corner - can't roll forward and can't roll back, with very limited
> time to come up with a solution. I see only a small number of
> alternatives:
>=20
> 1) Start aggressively trying to block or down-prioritize SatoshiDice
> transactions at the network level, to buy time and try to avoid
> mempool exhaustion. I don't know a good way to do this, although it
> appears that virtually all their traffic is actually coming via
> blockchain.infos My Wallet service. During their last outage block
> sizes seemed to drop to around 50kb. Alternatively, ask SD to
> temporarily suspend their service (this seems like a long shot).
>=20
> 2) Perform a crash hard fork as soon as possible, probably with no
> changes in it except a new block size limit. Question - try to lift
> the 1mb limit at the same time, or not?
>=20
>=20
>=20
>=20
> On Tue, Mar 12, 2013 at 2:01 AM, Pieter Wuille =
<pieter.wuille@gmail.com> wrote:
>> Hello again,
>>=20
>> block =
000000000000015c50b165fcdd33556f8b44800c5298943ac70b112df480c023
>> (height=3D225430) seems indeed to have cause pre-0.8 and 0.8 nodes to =
fork (at
>> least mostly). Both chains are being mined on - the 0.8 one growing =
faster.
>>=20
>> After some emergency discussion on #bitcoin-dev, it seems best to try =
to get
>> the majority mining power back on the "old" chain, that is, the one =
which
>> 0.7 accepts (with
>> 00000000000001c108384350f74090433e7fcf79a606b8e797f065b130575932 at =
height
>> 225430). That is the only chain every client out there will accept. =
BTC
>> Guild is switching to 0.7, so majority should abandon the 0.8 chain =
soon.
>>=20
>> Short advice: if you're a miner, please revert to 0.7 until we at =
least
>> understand exactly what causes this. If you're a merchant, and are on =
0.8,
>> stop processing transactions until both sides have switched to the =
same
>> chain again. We'll see how to proceed afterwards.
>>=20
>> --
>> Pieter
>>=20
>>=20
>>=20
>> On Tue, Mar 12, 2013 at 1:18 AM, Pieter Wuille =
<pieter.wuille@gmail.com>
>> wrote:
>>>=20
>>> Hello everyone,
>>>=20
>>> =CD've just seen many reports of 0.7 nodes getting stuck around =
block
>>> 225430, due to running out of lock entries in the BDB database. 0.8 =
nodes do
>>> not seem to have a problem.
>>>=20
>>> In any case, if you do not have this block:
>>>=20
>>>  2013-03-12 00:00:10 SetBestChain: new
>>> =
best=3D000000000000015aab28064a4c521d6a5325ff6e251e8ca2edfdfe6cb5bf832c
>>> height=3D225439  work=3D853779625563004076992  tx=3D14269257  =
date=3D2013-03-11
>>> 23:49:08
>>>=20
>>> you're likely stuck. Check debug.log and db.log (look for 'Lock =
table is
>>> out of available lock entries').
>>>=20
>>> If this is a widespread problem, it is an emergency. We risk having
>>> (several) forked chains with smaller blocks, which are accepted by =
0.7
>>> nodes. Can people contact pool operators to see which fork they are =
on?
>>> Blockexplorer and blockchain.info seem to be stuck as well.
>>>=20
>>> Immediate solution is upgrading to 0.8, or manually setting the =
number of
>>> lock objects higher in your database. I'll follow up with more =
concrete
>>> instructions.
>>>=20
>>> If you're unsure, please stop processing transactions.
>>>=20
>>> --
>>> Pieter
>>=20
>>=20
>>=20
>> =
--------------------------------------------------------------------------=
----
>> Symantec Endpoint Protection 12 positioned as A LEADER in The =
Forrester
>> Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in =
the
>> endpoint security space. For insight on selecting the right partner =
to
>> tackle endpoint security challenges, access the full report.
>> http://p.sf.net/sfu/symantec-dev2dev
>> _______________________________________________
>> Bitcoin-development mailing list
>> Bitcoin-development@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>>=20
>=20
> =
--------------------------------------------------------------------------=
----
> Symantec Endpoint Protection 12 positioned as A LEADER in The =
Forrester =20
> Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in =
the =20
> endpoint security space. For insight on selecting the right partner to=20=

> tackle endpoint security challenges, access the full report.=20
> http://p.sf.net/sfu/symantec-dev2dev
> _______________________________________________
> Bitcoin-development mailing list
> Bitcoin-development@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development