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.
Andrei is a leader of a team that works on Polkadot, a technology that helps it grow and support more parachains. His team focuses on four main areas: scalability/performance, observability, monitoring, and debugability, zombienet and integration testing, and node resilience. Some of the things Andrei has done include planning and implementing tasks to enable scale up to 300 and 500 paravalidators and 70 and 100 parachains, respectively. He has also worked on fixing gossip issues at scale, created tools to monitor block time and parachain tracing, and contributed to the design and features of Zombienet. Additionally, Andrei has improved node side resilience and investigated and fixed a Polkadot network issue that affected the ecosystem.
Threshold