hyperledger / fabric-x-committer / 30523187187

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main: 91%

Build Type

Pull #718

github

Committed by liran-funaro

Commit Message

[loadgen] Index-addressable workload with commit-time contention

#### Type of change

- New feature
- Improvement (improvement to code, performance, etc)

#### Description

Make the load generator's workload a pure function of a single global atomic
transaction index, and generate commit-time contention intrinsically by letting
slots reference existing keys by index instead of always creating fresh ones.
The default workload (new-keys-rate unset) is unchanged.

- Index-addressable generation: each slot's key and value, the nonce/TX-ID, and
  the metadata are derived from a domain-separated SHA-256 PRF over
  (rootSeed | domain | global-index), so any transaction is regenerable in O(1)
  by its global index -- no replay, buffer, or in-memory key store.
- A single shared atomic transaction-index counter replaces the per-worker PRNGs
  and seeders, so the generated multiset is identical for any worker count
  (workers are pure parallelism); reproducibility needs only the seed.
- New-vs-existing key split: keys live in one flat global index space; a key is
  created only by a write slot, and every other slot references an existing key
  within a moving working set below the frontier C(N) = floor(N * new-keys-rate).
  Knobs: `new-keys-rate` (creates per tx, writes-first with read-only spill),
  `reference-gap` (tx-distance behind for references), and `lookback-window`
  (working-set size). This produces contention the coordinator must order and
  subsumes the old DependencyDescription/ConflictProfile machinery.
- Batch-only, context-free pipeline: `buildBatch(n)` reserves n global indices
  with a single atomic increment and `signBatch` signs; the optional per-worker
  query stage lives in the stream worker (nil = no-op). Removes `Next()`,
  `Generator[T]`/`GenerateArray`, `MultiGenerator`, and `primitives.go`.
- Config consolidation: fold key-size and invalid-signature probability into
  `TransactionProfile`; drop `KeyProfile`/`ConflictProfile`; delete t... (continued)

Pull Request Pull Request #718: [loadgen] Index-addressable workload with commit-time contention

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242 of 252 new or added lines in 11 files covered. (96.03%)

36 existing lines in 7 files now uncovered.

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