platinumhamburg opened a new pull request, #3463:
URL: https://github.com/apache/fluss/pull/3463
Introduce a two-tier backpressure model to keep RocksDB write stall from
blocking RPC handler threads:
- Tier 1 (piggyback): server reports a normalized [0, 1) pressure on
PbPutKvRespForBucket once L0 reaches kv.backpressure.l0-slowdown-trigger
(default 12); client throttles per bucket with max_throttle_ms * p^3 via
client.writer.kv-backpressure.max-throttle-ms (default 5000ms).
- Tier 2 (hard rejection): once L0 reaches RocksDB's
level0_slowdown_writes_trigger, server throws StorageBackpressureException
(Errors code 71, RetriableException); client applies the same max-throttle
window as backoff before retry.
Add maintenance configuration doc for the new server option.
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Linked issue: close #3454 3454
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