An4kn opened a new pull request, #1584:
URL: https://github.com/apache/ratis/pull/1584
## What
Scales the Raft-over-QUIC benchmark from a single machine to a 5-server /
5-client cluster on SLURM (DCC, Poznan University of Technology) and adds
the measurements needed to compare the QUIC transport with TCP+TLS.
## Changes
- RaftBench: closed-loop read-your-writes workload split over several
client nodes (--worker-offset), control counters (sent / committed /
failed / connection failures), raw sample dump (--lat-file) merged into
one percentile pool by scal.sh, and a hop probe that splits latency into
client->leader and leader->client without clock synchronisation.
- Leader-side AppendEntries RTT (HOPSTAT) and follower-side gap
diagnostics (FGAP) printed to server logs.
- QUIC single-stream layout (raft.quic.server.single-stream) as a control
variant: same stack, one stream per peer connection instead of one per
message type.
- Optional heartbeat thread appender for both transports
(raft.server.log.appender.heartbeat.thread), plus --rpc-timeout and
--no-prevote flags for leadership-stability experiments.
- Cluster scripts: run_matrix.sh (full factorial sweep), matrix6.sh
(chunking into SLURM reservations), pilot_hb.sh, szukaj_dysk8.sh,
ssh multiplexing in run_lan.sh, RAM_LOG and READTPUT control
- ECDSA P-256 server certificates instead of RSA-4096 (RSA signing cost
differed between the two BoringSSL builds and skewed QUIC handshakes).
- Docs: benchmark/README.md, RUNBOOK*, HB-THREAD-CHANGES.md,
QUIC_IMPLEMENTATION.md updates.
## Results
72-point matrix (transport x connection model x payload x 5..30 clients),
summarised in benchmark/README.md section 8.
All new server options default to off; without flags the servers behave
exactly as before.
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