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split network and security enhancements

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Patrick Lodder 2021-08-20 06:10:34 +02:00
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doc/release-notes.md
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@ -73,9 +73,25 @@ their wallets with the `-paytxfee=<amount per kb>` option.
Synchronization Improvements
----------------------------
* Disconnect peers which do not respond to requests for headers in a timely manner, to optimise synchronization rate.
* Dogecoin Core will no longer request further headers from a peer it is already downloading headers from. This stops Dogecoin Core from requesting the same headers more than once, and reduces network bandwidth wasted.
* Proactively reject block headers which would build on an invalid chain.
This release removes a bug in the network layer where a 1.14 node would open
many parallel requests for headers to its peers, increasing the total data
transferred during initial block download up to 50 times the required data, per
peer, unnecessarily. As a result, synchronization has time has been reduced by
around 2.5 times.
Additionally, when a node is in initial synchronization and a peer takes too
long to respond to a new header request, it is now aggressively disconnected,
to free connection slots for faster peers and not add more stress to already
overloaded peers.
Security enhancements
---------------------
* Proactively disconnect peers sending block headers which would build on an
invalid chain.
* Improve handling and logging of invalid blocks and their descendants
* Fix a bug that was preventing nodes to load a fixed peer list in case DNS
services are unreachable.
GUI Improvements
----------------
@ -101,7 +117,6 @@ Minor Changes
* Modify Scrypt code so it's compatible with Alpine Linux's musl library.
* Update libevent to 2.1.11
* Update ZMQ to 4.3.4
* Correctly set fixed seeds on startup.
* Add build instructions for NixOS.
* Fix a rare crash bug on shutdown due to ActivateBestChain() being called when there is no best chain.
* Fix port numbers in `contrib/seeds/generate-seeds.py`.