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Chris LuandDevin
1cfd9bbb4c
* volume: run the durable sync outside the reader-visible lock Reads of a volume waited on that volume's fsync because the write lock was held across Sync()/sync_all. A new per-volume lock (Go dataFileSyncLock, Rust data_file_sync_lock) now serializes every .dat mutation and lifecycle op across append+publish+sync+rollback, while the fsync itself runs with dataFileAccessLock/the io write guard dropped — so readers proceed during a sync, and a failed sync's rollback still cannot clobber another write or a compaction swap. Same change in Go (volume_write.go syncWrite/processBatch, SyncToDisk) and Rust (write_needles_grouped/write_synced_run). Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * volume: publish after sync; fix Close/CommitCompact lock order Address review on #11863: - Close took dataFileSyncLock before waiting on isCompactionInProgress while CommitCompact claims the flag then takes the lock — a deadlock. Close now claims the flag before taking the locks (flag -> sync -> access). - Go now publishes needle-map entries only after the .dat sync, matching Rust's ordering: appendWriteRequest/appendDeleteRequest stage the bytes, publishWriteRequest/publishDeleteRequest index them after Sync. A failed sync rolls back bytes no reader ever resolved — the streamed-read offset-invalidation window is gone. processBatch splits runs at repeated needle ids (Rust parity) so dedup/cookie checks stay sequential; the old snapshot/restore rollback machinery is removed. - Rust commit_compact (store-lock caller) takes data_file_sync_lock via try_lock -> WouldBlock before the write lease; commit_compact_held and the tier-down _held paths document/require the caller-held sync lock, and the two vol.instance().write_lock() grpc sites take it first. The swap can no longer land between a durable write's append and publish. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * volume: restore write watermarks when an inline fsync fails The syncWrite rollback truncated the .dat but left lastAppendAtNs, lastWriteAppendAtNs, lastWriteNeedleKey, lastWriteDeleted and lastModifiedTsSeconds describing the rejected write; recovery and compaction could read a watermark for a record that no longer exists. Snapshot and restore them on failure, as processBatchRun already does. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> --------- Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>