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Chris LuandGitHub
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* fix(volume): cap leveldb OpenFilesCacheCapacity per index DB (#9139) The leveldb opt.Options for NeedleMapLevelDb / Medium / Large never set OpenFilesCacheCapacity, so each leveldb instance defaulted to goleveldb's 500. On servers with thousands of volumes, that ceiling stacks across DBs and exhausts even high ulimits, starving WAL rotation: failed to write leveldb: open .../000006.log: too many open files CompactionTableSizeMultiplier=10 already keeps the SST count low, so a small per-DB cache is sufficient. Cap at 16 / 32 / 64 for the small / medium / large variants so per-DB FD usage is bounded. * storage: hoist leveldb FD-cap values into named constants Per review feedback: replace the inline 16/32/64 literals with LevelDb{,Medium,Large}OpenFilesCacheCapacity, and move the rationale (why 500 is too high per-DB on busy servers, what the tradeoff is) into a package-level comment so future readers see the memory vs. performance picture at the constant declaration instead of inline.