Now fetchBatched maintains a sliding window of batchSize blocks in-flight.
When 75% complete, adds next chunk to maintain constant window size.
This ensures blocks are already pending or have been fetched when
StoreStream needs them.
Part of https://github.com/codex-storage/nim-codex/issues/974
Signed-off-by: Chrysostomos Nanakos <chris@include.gr>
Implements delta-based WantList updates to reduce network traffic during
block exchange. Only sends newly added blocks instead of resending the
entire WantList on every refresh.
Also some network related fixes:
- Add TCP_NODELAY flag to prevent Nagle's algorithm delays
- Clear sendConn on stream reset to allow garbage collection
- Improve error handling in NetworkPeer.send()
Part of https://github.com/codex-storage/nim-codex/issues/974
Signed-off-by: Chrysostomos Nanakos <chris@include.gr>
Returns false on duplicate marking attempts instead of logging errors,
eliminating duplicate marking loop in blockPresenceHandler and
preventing duplicate block requests across concurrent flows.
Part of https://github.com/codex-storage/nim-codex/issues/974
- Add codex_block_exchange_discovery_requests_total counter to track peer
discovery frequency
- Add codex_block_exchange_peer_timeouts_total counter to monitor peer
reliability issues
- Add codex_block_exchange_requests_failed_total counter to track request
failure rates
Part of https://github.com/codex-storage/nim-codex/issues/974
Achieves significant memory reduction with equivalent network
performance. The reduced batch size prevents memory pressure
while preserving transfer efficiency, improving overall system
resource utilization.
Part of https://github.com/codex-storage/nim-codex/issues/974
This prevents unbounded peer accumulation while maintaining redundancy.
When peer count exceeds the maximum, the least active peers are removed from
tracking to free resources.
Part of https://github.com/codex-storage/nim-codex/issues/974
Use probabilistic distribution based on peer quality scores, giving all peers
opportunity while favoring better-performing ones. Selection probability is
inversely proportional to score.
Part of https://github.com/codex-storage/nim-codex/issues/974
