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leonarski_fandClaude Opus 4.8 9b1eeb1342
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TCP stream: tolerate writer backpressure via BUSY heartbeats
A slow filesystem could stall the writer's receive pipeline, propagating
TCP backpressure to the pusher. The pusher's 3s per-frame send deadline
then treated that backpressure as a dead peer and force-closed the
connection mid-run. The writer reconnected as a brand-new connection that
was not part of the active session, so the rest of the run was silently
dropped and the half-written HDF5 file was later finalized with holes.

Replace the throughput-based send timeout with a peer-liveness timeout:

- Add TCPFrameType::BUSY (wire version 2 -> 3).
- TCPImagePuller runs a heartbeat thread that sends BUSY every 250ms on a
  thread independent of the stalled write path, so liveness keeps flowing
  during deep stalls. A send_mutex serializes ACK/pong/heartbeat writes.
- TCPStreamPusher refreshes last_peer_activity on every inbound frame and
  only declares a connection dead after peer_liveness_timeout (15s) of
  complete silence, tolerating arbitrarily long backpressure while still
  catching a genuinely dead peer (and immediate EPIPE/ECONNRESET).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-23 16:30:16 +02:00
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