LevelDB 批量导入 2.8 亿行内存涨到 19GB：调 write_buffer/cache、每 2~5 万行 flush、并发限 3~4

Domain: database · Evidence E0 — Contributor self-reported

leveldbbulk-importmemoryflushcompaction

Summary

往 LevelDB 批量写入（单次 2.8 亿行）时，服务进程内存从 0.3GB 涨到 **19GB**，32GB 机器只剩 1GB 可用，

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