leonarski_f
97c3008c39
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A slow filesystem could stall the writer's consume pipeline, propagating TCP backpressure to the pusher. The pusher then treated that backpressure as a dead peer and force-closed the connection mid-run; the writer reconnected as a brand-new connection outside 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/progress-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 (possibly stalled) write path, so liveness keeps flowing during deep stalls. A send_mutex serializes ACK/pong/heartbeat writes. - TCPStreamPusher refreshes last_peer_activity_ns 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). - Re-key both backpressure waits (the SendAll data path and the post-END WaitForEndAck) onto this liveness signal instead of byte-progress / DATA-ACK-progress, so a slow final flush at END is tolerated too. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>