Andrei leads the parachain engineering team. His team works on all the small/big optimizations to make Polkadot scale and support more parachains. We as the fellows think that all the contributions he has done approve rank 2. We see him on a good path to get a fellow in the future as well :)
Here is a list of him on all the things he has done while working on Polkadot:
My contributions focus mostly on the node side and I could split them into 4 categories:
- Scalability/performance
- Observability, monitoring and debugability
- Zombienet and integration testing
- Node resilience
On Scalability/performance:
- 2023 Q2 plan and implementation of tasks to enable scale up to 300 paravalidators and 70 parachains - https://github.com/paritytech/roadmap/issues/25
- 2023 Q3/Q4 plan and work items for 500 paravalidators and 100 parachains https://github.com/paritytech/roadmap/issues/26
- Monster PR - V2 assignments support, Versi tested, currently pending reviews - https://github.com/paritytech/polkadot/pull/7038
- Fixes for gossip issues at scale - https://github.com/paritytech/polkadot/pull/6401
On observability, monitoring and debugability
- https://github.com/paritytech/polkadot-introspector - Started this project with an empty repo and established a roadmap for the project. My main code contribution is the initial design and implementation:
- Initial design, architecture and partial implementation
- Parachain Tracer Tool - https://github.com/paritytech/polkadot-introspector/tree/master/parachain-tracer
- Block time Monitor Tool - https://github.com/paritytech/polkadot-introspector/tree/master/block-time
- Storage core components: https://github.com/paritytech/polkadot-introspector/pull/69
- Per subsystem CPU usage tracking: https://github.com/paritytech/substrate/pull/10196 + https://github.com/paritytech/substrate/pull/10196
- Runtime metrics https://github.com/paritytech/polkadot/pull/4483 (later used to debug inherent weight issues during the Polkadot dispute storm incident: https://forum.polkadot.network/t/polkadot-dispute-storm-the-postmortem/2550)
- Authority status of nodes, currently used by community to figure out if their node is in the active set: https://github.com/paritytech/polkadot/pull/4699
- Fixing Multiple other PRs that add metrics, improve logs etc that I won’t mention here
On integration testing:
- Contributed to Zombienet design, features and roadmap with suggestions from the perspective of the Parachain Core Team
- New test collator with configurable CPU and PoV size (predates the Glutton work) used in CI - https://github.com/paritytech/polkadot/pull/4797
- Malus support for triggering disputes against valid and for invalid, this is the way the Parachain team tests disputes on Versi and in CI - https://github.com/paritytech/polkadot/pull/5011
- Created the initial suite of Zombienet integration CI tests for disputes:
Node side resilience
- Finality stalls become way more manageble: https://github.com/paritytech/polkadot/pull/6106 + https://github.com/paritytech/polkadot/pull/6054
- https://github.com/paritytech/polkadot/pull/4735
Investigated, fixed and wrote a post about a Polkadot network issue that affected the ecosystem.
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