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Summary: By supporting direct IO in RandomAccessFileReader::MultiRead, the benefits of parallel IO (IO uring) and direct IO can be combined. In direct IO mode, read requests are aligned and merged together before being issued to RandomAccessFile::MultiRead, so blocks in the original requests might share the same underlying buffer, the shared buffers are returned in `aligned_bufs`, which is a new parameter of the `MultiRead` API. For example, suppose alignment requirement for direct IO is 4KB, one request is (offset: 1KB, len: 1KB), another request is (offset: 3KB, len: 1KB), then since they all belong to page (offset: 0, len: 4KB), `MultiRead` only reads the page with direct IO into a buffer on heap, and returns 2 Slices referencing regions in that same buffer. See `random_access_file_reader_test.cc` for more examples. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6446 Test Plan: Added a new test `random_access_file_reader_test.cc`. Reviewed By: anand1976 Differential Revision: D20097518 Pulled By: cheng-chang fbshipit-source-id: ca48a8faf9c3af146465c102ef6b266a363e78d1 |
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| .. | ||
| blob_compaction_filter.cc | ||
| blob_compaction_filter.h | ||
| blob_db.cc | ||
| blob_db.h | ||
| blob_db_gc_stats.h | ||
| blob_db_impl.cc | ||
| blob_db_impl.h | ||
| blob_db_impl_filesnapshot.cc | ||
| blob_db_iterator.h | ||
| blob_db_listener.h | ||
| blob_db_test.cc | ||
| blob_dump_tool.cc | ||
| blob_dump_tool.h | ||
| blob_file.cc | ||
| blob_file.h | ||
| blob_log_format.cc | ||
| blob_log_format.h | ||
| blob_log_reader.cc | ||
| blob_log_reader.h | ||
| blob_log_writer.cc | ||
| blob_log_writer.h | ||