network update

blog/2023-07-31-network.md

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+---
+title: Network Team Update
+slug: 2023-07-31-network
+authors: coot
+tags: [network]
+hide_table_of_contents: false
+---
+
+
+## Network Update (Sprints 39 & 40)
+
+The network updates got distracted.  Mostly because of me leaving for the meeting in Edinburgh, Scotland and the being away.
+It was great to see and talk to so many of the community members.
+
+### Sprint 39 (Jun 26 - Jul 09)
+
+#### Major changes
+
+Now the following __list of traces will be turned on by default__:
+
+##### `node-to-client` protocol
+
+- `LocalConnectionManagerTracer` 
+- `LocalInboundGovernor`
+- `LocalHandshake`
+- `LocalServer`
+
+##### `node-to-node` protocol
+
+- `Server`
+
+See [cardano-node#5353].  This will be released in `node-8.2.0`.
+
+
+We made sure that `cardano-client-0.1.0.x` library (which is `db-sync`) is not using the experimental `node-to-client` protocol.
+The `cardano-client-0.2.0.0` was not affected.
+See [ouroboros-network#4612].
+
+We merged the __dynamic block production feature__ to `ouroboros-consensus` (also available in the `cardano-node-8.2.0` release).
+Dynamic block production enables hot-swap p2p nodes, which are important for the p2p deployment of block-producing nodes.
+See [ouroboros-network#3159], [ouroboros-consensu#140].
+
+We continued to review the implementation of big ledger peers for eclipse evasion, see [ouroboros-network#4462].
+
+#### Minor changes
+
+- We refactored the top level `cardano-node` error handler: [cardano-node#5356]
+
+
+### Sprint 40 (Jul 09 - Jul 23)
+
+#### Major changes
+
+We integrated `ouroboros-network-0.8.2.0` with the `master` branch of `cardano-node` for the `8.2.0` release (the version match between `ouroboros-network` and `cardano-node` is purely accidental).
+This includes:
+
+* integration with __dynamic block production__ feature.
+  This feature is documented in the [following PR][cardano-node#5399].
+* __Warm valency__ for local root peers (see below).
+
+For the full list of features included in the `8.2.0` release from the network side, please take a look at the [pre-release nodes][cardano-node-8.2.0-pre].
+
+
+We __improved the memory footprint__ of peer metrics measured by the P2P stack.
+Peer metrics are used to decide which peers to demote every churn interval (roughly every hour with some probabilistic fluctuation).
+See [ouroboros-network#4620].
+The improvement will be available in `cardano-node-8.2.0`.
+
+We added an __optional explicit warm valency__ to local root peers of the __P2P topology file__.
+Previously we used an implicit valency, e.g. the node keeps connections to all of the local roots; with local warm valency the node will pick only that many peers from the local root peers group to connect to.
+The hot valency (previously known simply as valency) hasn't changed, but it must be smaller than the warm valency as hot peers are selected from warm ones.
+Warm valency is a useful feature to limit resource consumption if one of the domain names in the local root peer group resolves to many IP addresses.
+See [ouroboros-network#4575], [cardano-node#5409].
+
+[cardano-node#5353]: https://github.com/input-output-hk/cardano-node/pull/5353
+[cardano-node#5356]: https://github.com/input-output-hk/cardano-node/pull/5356
+[cardano-node#5399]: https://github.com/input-output-hk/cardano-node/pull/5399
+[cardano-node#5409]: https://github.com/input-output-hk/cardano-node/pull/5409
+[cardano-node-8.2.0-pre]: https://github.com/input-output-hk/cardano-node/releases/tag/8.2.0-pre
+[ouroboros-network#4575]: https://github.com/input-output-hk/ouroboros-network/pull/4575
+[ouroboros-network#4612]: https://github.com/input-output-hk/ouroboros-network/pull/4612
+[ouroboros-network#4620]: https://github.com/input-output-hk/ouroboros-network/pull/4620
+[ouroboros-network#3159]: https://github.com/input-output-hk/ouroboros-network/issues/3159
+[ouroboros-network#4462]: https://github.com/input-output-hk/ouroboros-network/pull/4462
+[ouroboros-consensus#140]: https://github.com/input-output-hk/ouroboros-consensus/pull/140
+
+[sprint-39]: https://github.com/orgs/input-output-hk/projects/19/views/16?filterQuery=sprint%3A%22Sprint+39%22
+[sprint-40]: https://github.com/orgs/input-output-hk/projects/19/views/16?filterQuery=sprint%3A%22Sprint+40%22