Daan MeijerandClaude Opus 5.5
8475969145
A chunk not in after NNTP_HEDGE_AFTER_SECONDS (10) is asked again on one of NNTP_HEDGE_CONNECTIONS spare connections; the first answer wins and the other connection is closed (lib/nntp/hedge.ts, tested). Connections can be retired after NNTP_CONNECTION_MAX_MINUTES (±25%). The prefetch report counts hedges and slow first requests by connection age. Homelab, 15 min each: hedging on (40 + 6) 280k articles/s, off 273k. The second request won about half of its races, but ~25-35% of first requests were slow (>10 s) at every connection age, so neither helps: Eweka is slow under our load, not on particular connections. Both off by default; the age statistics stay. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
67 lines
3.1 KiB
TypeScript
67 lines
3.1 KiB
TypeScript
import env from '#start/env'
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import app from '@adonisjs/core/services/app'
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/** The coordinator (REBUILD.md, part 1). */
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export default {
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/** Articles per range. */
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rangeArticles: env.get('RANGE_ARTICLES', 2_000_000),
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/**
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* Articles per XOVER chunk (spool files, stream frames). Eweka takes
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* ~1.5–2 s per command whatever its size: one connection read 9–15k
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* lines/s in chunks of 25k, ~20k in 50k, ~30k in 100k and 200k (LOG.md
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* 2026-10-09).
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*/
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chunkArticles: env.get('CHUNK_ARTICLES', 100_000),
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/**
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* The live tail (REBUILD.md, coordinator): new articles become ranges
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* every `everySeconds` (one LIST ACTIVE per name prefix), leased and
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* fetched before any history. A group gets a tail range once it has
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* `minArticles` new (a chunk) or its oldest unplanned article waited
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* `maxDelayMinutes`, so a quiet group doesn't make a range every round.
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*/
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tail: {
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everySeconds: env.get('TAIL_EVERY_SECONDS', 120),
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minArticles: env.get('TAIL_MIN_ARTICLES', 100_000),
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maxDelayMinutes: env.get('TAIL_MAX_DELAY_MINUTES', 15),
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/** Before the history's 0 (oldest) … 1000 (newest). */
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priority: -1,
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},
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/** A leased range without a heartbeat for this long goes back to the queue. */
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leaseTtlSeconds: env.get('LEASE_TTL_SECONDS', 15 * 60),
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/** NNTP connections the coordinator fetches headers with. */
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nntpConnections: env.get('NNTP_CONNECTIONS', 4),
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/**
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* A reply with no data for this long fails, and its connection is replaced.
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* Eweka sometimes stops answering on long-lived connections (all 40 quiet,
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* a fresh one answers in seconds; LOG.md 2026-10-09 (14)): at 10 minutes
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* the prefetcher nearly stopped. Data arrives within seconds otherwise.
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*/
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nntpTimeoutMs: env.get('NNTP_TIMEOUT_MS', 2 * 60 * 1000),
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/**
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* A chunk not fetched after this long is asked again on another
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* connection; the first answer wins and the other connection is closed.
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* Eweka stalls single requests: the same chunk took 27–52 s on one
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* connection and 1–9 s on another at the same moment; median ~3 s
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* (LOG.md 2026-10-09 (15)). Measured in production (40 + 6 connections vs
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* 40, 15 min each): 280k vs 273k articles/s, within the noise; the second
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* request won half the time. Off by default.
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*/
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nntpHedgeAfterMs: env.get('NNTP_HEDGE_AFTER_SECONDS', 10) * 1000,
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/** Of nntpConnections, kept for those second requests (the prefetcher's loops are the rest). 0: no hedging. */
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nntpHedgeConnections: env.get('NNTP_HEDGE_CONNECTIONS', 0),
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/**
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* A connection is closed after this long (when it's free), and a fresh one
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* opened. 0: never. Requests were as often slow (>10 s) on connections
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* under 2 minutes old as on ones over 10 (~25–35%; LOG.md 2026-10-09 (16)).
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*/
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nntpConnectionMaxMs: env.get('NNTP_CONNECTION_MAX_MINUTES', 0) * 60 * 1000,
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spool: {
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dir: env.get('SPOOL_DIR', app.tmpPath('spool')),
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/** Ranges kept fetched ahead, per active lease. */
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aheadPerLease: env.get('SPOOL_AHEAD_PER_LEASE', 2),
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/** At least this many ranges ahead, so the first leases start at once. */
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minAhead: env.get('SPOOL_MIN_AHEAD', 2),
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maxBytes: env.get('SPOOL_MAX_GB', 10) * 1e9,
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},
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}
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