BlueStore V2 - an Evolutionary Step Forward
summary
BlueStore V2 describes concrete fixes and new components: a lazy unpinning approach that stabilizes cache reference counting after nine PR attempts, a bootable BlueFS that accepts 4K bluefs chunks to avoid “no space” failures, and a plan for a spillover revert to move RocksDB SSTs from slow HDD back to SSD. It reports specific past failures (RocksDB corruption, OSD superblock loss), shows a simulator for allocator experiments, and proposes lazy compression, a custom write‑ahead log and an iterative fragmentation fixer.
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