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dbc2db5228
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/15241 Native `TableFactory` implementations receive the RocksDB `WritableFileWriter` in `NewTableBuilder()` and `RandomAccessFileReader` in `NewTableReader()`. These wrappers provide buffering, checksums, rate limiting, statistics, listeners, tracing, and direct-I/O handling. External table implementations previously received a limited writable-file adapter and reopened readers from a path, bypassing parts of this wrapper logic. This change makes `WritableFileWriter` and `RandomAccessFileReader` implement `FSWritableFile` and `FSRandomAccessFile`, respectively, so the same RocksDB wrappers can be passed to external tables. `ExternalTableFactory::NewTableReader()` now receives the already-opened reader and file size. The filesystem interfaces expose standard append, flush, sync, fsync, file metadata, synchronous reads, asynchronous reads, and batched reads. `RandomAccessFileReader::SubmitReadAsync()` schedules its wrapped coroutine read on the configured filesystem read executor, and the DB table-cache and `SstFileReader` construction paths pass that filesystem through. `SstFileReader` also supplies its configured statistics, listeners, rate limiter, and file temperature, removing the need for a separate external-table metrics filesystem wrapper. For direct I/O, `MultiRead()` checks whether requests are already sorted. When alignment and merging are needed, it constructs a sorted index only for unsorted input, preserving caller request order and result mapping. Fully aligned requests using aligned caller buffers bypass this path and may be supplied in any order. Reviewed By: xingbowang Differential Revision: D121035539 fbshipit-source-id: 27cb897726c31cb1a4dc811c65c8d79e690d82b1