cdad04b051
Summary: Remove double buffering on RandomRead on Windows. With more logic appear in file reader/write Read no longer obeys forwarding calls to Windows implementation. Previously direct_io (unbuffered) was only available on Windows but now is supported as generic. We remove intermediate buffering on Windows. Remove random_access_max_buffer_size option which was windows specific. Non-zero values for that opton introduced unnecessary lock contention. Remove Env::EnableReadAhead(), Env::ShouldForwardRawRequest() that are no longer necessary. Add aligned buffer reads for cases when requested reads exceed read ahead size. Closes https://github.com/facebook/rocksdb/pull/2105 Differential Revision: D4847770 Pulled By: siying fbshipit-source-id: 8ab48f8e854ab498a4fd398a6934859792a2788f |
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