Network update: sprints 80 & 81

Author: coot

blog/2025-02-19-network.md

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+---
+title: Network Team Update
+slug: 2025-02-19-network
+authors: [coot]
+tags: [network]
+hide_table_of_contents: false
+---
+
+## Overview of [sprint 80][sprint-80] & [sprint 81][sprint-81]
+
+### Current workstream
+
+We decided to hold some PRs in favour of some others to simplify the merging
+process.  Here's a dependency graph for PRs on which we're working on.  The
+[**Extensible Ouroboros Network Diffusion Stack**][ouroboros-network#5016] PR
+was the largest in our queue.
+
+```mermaid
+flowchart TD;
+  SRV[SRV implementation]:::open
+  E[Mux: bind threads to a capability]:::open
+  D[<b>Peer Selection Exports</b>]:::open
+  C[Public Network State]:::open
+  B[Drop NonP2P Components]:::open
+  A[Extensible Ouroboros Network Components]:::merged
+  MAIN[main]
+  ouroboros-network-0.19
+  tx[TX Submission Logic]:::open
+
+
+  B-->A;
+  C-->B;
+  D-->B;
+  E-->A;
+  A-->MAIN
+  SRV-->A;
+  MAIN-->ouroboros-network-0.19
+  tx-->ouroboros-network-0.19
+
+  click A "https://github.com/IntersectMBO/ouroboros-network/pull/5016" _blank
+  click B "https://github.com/IntersectMBO/ouroboros-network/pull/5007" _blank
+  click C "https://github.com/IntersectMBO/ouroboros-network/pull/5046" _blank
+  click D "https://github.com/IntersectMBO/ouroboros-network/pull/5081" _blank
+  click E "https://github.com/IntersectMBO/ouroboros-network/pull/5069" _blank
+  click SRV "https://github.com/IntersectMBO/ouroboros-network/pull/5018" _blank
+  click tx "https://github.com/IntersectMBO/ouroboros-network/pull/4887" _blank
+
+  classDef merged color:#000000, stroke:#8256D0, fill:#8256D0, font-weight:bold
+  classDef open color:#000000, stroke:#347D39, fill:#347D39, font-weight:bold
+```
+
+### Fixes which made into the on-going `cardano-node-10.2.1`
+
+* We fixed the peer-sharing application to only use the negotiated
+  `peerSharing` flag in the [`NodeToNodeVersionData`]; see
+  [ouroboros-network#5061].
+* We modified `IOError` exception handling: [ouroboros-network#5076].
+
+Previously, we introduced a new `IOError` handling policy due to a discussion with
+an SPO to make some scenarios easier to debug.  After testing it (the changes
+never made it into a release), it turned out this could lead to attacks on the
+system.  Thus, we advocate for better monitoring of nodes (e.g. if resources
+like file descriptors memory are available, the node is making progress)
+rather than rely on `cardano-node` to be up and running.
+
+### New mux strategy for starting mini-protocols
+
+[Karl Knutsson][karl] ([CF]) implemented a new strategy for starting
+mini-protocols, `StartOnDemandAny`.  A mini-protocol which is using this
+strategy will be started as soon as any `StartOnDemand` (or `StartOnDemandAny`)
+mini-protocol receives input from the network.  We will use this starting
+strategy for the `keep-alive` mini-protocol.
+
+### Local-TX-Monitor protocol changes
+
+A new query was added, which allows the retrieval of all measures/dimensions of the
+mempool capacity, e.g. byte-size capacity, ledger's execution units for both
+memory and execution steps, and reference
+scripts size. See [ouroboros-network#4918].
+
+### Network Specification Updates
+
+We made language improvements in the network specification, see
+[ouroboros-network#5044]; and some smaller changes/fixes
+[ouroboros-network#5053].
+
+### Other minor changes
+
+* [**Label some threads**][ouroboros-network#5050];
+* [**Churn no timeouts test failure**][ouroboros-network#5072];
+* [**Added haddocks to MiniProtocol type**][ouroboros-network#5073];
+
+[sprint-80]: https://github.com/orgs/IntersectMBO/projects/5/views/1?filterQuery=sprint%3A%22Sprint+80%22
+[sprint-81]: https://github.com/orgs/IntersectMBO/projects/5/views/1?filterQuery=sprint%3A%22Sprint+81%22
+
+[karl]: https://github.com/karknu
+[CF]: https://www.cardanofoundation.org/
+
+[`NodeToNodeVersionData`]: https://ouroboros-network.cardano.intersectmbo.org/ouroboros-network-api/Ouroboros-Network-NodeToNode-Version.html#t:NodeToNodeVersionData
+
+[ouroboros-network#4918]: https://github.com/IntersectMBO/ouroboros-network/pull/4918
+[ouroboros-network#5007]: https://github.com/IntersectMBO/ouroboros-network/pull/5007
+[ouroboros-network#5016]: https://github.com/IntersectMBO/ouroboros-network/pull/5016
+[ouroboros-network#5044]: https://github.com/IntersectMBO/ouroboros-network/pull/5044
+[ouroboros-network#5046]: https://github.com/IntersectMBO/ouroboros-network/pull/5046
+[ouroboros-network#5050]: https://github.com/IntersectMBO/ouroboros-network/pull/5050
+[ouroboros-network#5053]: https://github.com/IntersectMBO/ouroboros-network/pull/5053
+[ouroboros-network#5061]: https://github.com/IntersectMBO/ouroboros-network/pull/5061
+[ouroboros-network#5072]: https://github.com/IntersectMBO/ouroboros-network/pull/5072
+[ouroboros-network#5073]: https://github.com/IntersectMBO/ouroboros-network/pull/5073
+[ouroboros-network#5076]: https://github.com/IntersectMBO/ouroboros-network/pull/5076