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由 奏之章 提交于
Summary: ```PosixMmapReadableFile::fd_``` is closed after created, but needs to remain open for the lifetime of `PosixMmapReadableFile` since it is used whenever `InvalidateCache` is called. Closes https://github.com/facebook/rocksdb/pull/2764 Differential Revision: D8152515 Pulled By: ajkr fbshipit-source-id: b738a6a55ba4e392f9b0f374ff396a1e61c64f65
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