- concurrency.loop_semaphore: per-event-loop semaphores (safe across pytest loops
and process restarts via a WeakKeyDictionary keyed by the running loop).
- provider: holds a per-account (≤4) and per-host (PER_HOST_CONN_CAP) slot for the
whole lifetime of an IMAP socket, released on close; SMTP send takes a per-host
slot for its duration. A worker can no longer open hundreds of sockets to one
host/account.
- indexer: parsing goes through a PARSE_CONCURRENCY semaphore, and a message over
STREAM_PARSE_MB is parsed from its blob file (parse_message_file) instead of an
in-memory tree, so peak RAM ~= PARSE_CONCURRENCY x STREAM_PARSE_MB regardless of
mailbox sizes. Backfill parallelism stays bounded by the bulk queue only.
- config: PER_HOST_CONN_CAP, PARSE_CONCURRENCY, STREAM_PARSE_MB.
- tests: per-account cap blocks the 5th connection / distinct accounts independent;
file-vs-bytes parse equivalence + large-message streaming routing.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
lukasandClaude Opus 4.8
9dbc5ed998