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Update release-notes.md

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Transaction memory pool limiting

Priority transactions

Wallet transaction fees
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MarcoFalke 2016-01-07 15:38:06 +01:00
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@ -215,6 +215,46 @@ of just announcing the hash. In a reorganization, all new headers are sent,
instead of just the new tip. This can often prevent an extra roundtrip before
the actual block is downloaded.
Memory pool limiting
--------------------------------
Previous versions of Bitcoin Core had their mempool limited by checking
a transaction's fees against the node's minimum relay fee. There was no
upper bound on the size of the mempool and attackers could send massive
amounts of transactions paying just slighly more than the default minimum
relay fee to crash nodes with relatively low RAM. A temporary workaround
for previous versions of Bitcoin Core was to raise the default minimum
relay fee.
Bitcoin Core 0.12 will have a strict maximum size on the mempool. The
default value is 300 MB and can be configured with the `-maxmempool`
parameter. Whenever a transaction would cause the mempool to exceed
it's maximum size, the transaction with the lowest feerate will be
evicted and the node's minimum relay fee will be increased to match
this feerate. The initial minimum relay fee is set to 1000 satoshis
per kB.
Priority transactions
---------------------
Transactions that do not pay the minimum relay fee, are called "free
transactions" or priority transactions. Previous versions of Bitcoin
Core would relay and mine priority transactions depending on their
setting of `-limitfreerelay=15` (kB per minute) and
`-blockprioritysize=50000` (bytes of a block's priority space).
Priority code is planned to get moved out of from Bitcoin Core 0.13
and the default block priority size was set to `0` in Bitcoin Core
0.12.
Wallet transaction fees
-----------------------
Various impromements were made how the wallet calculates transaction
fees.
...
Negative confirmations and conflict detection
---------------------------------------------