leonarski_f 97c3008c39
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TCP stream: tolerate writer backpressure via BUSY heartbeats ...
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 >
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leonarski_f
97c3008c39