swh:1:snp:5115096b921df712aeb2a08114fede57fb3331fb
Revision 4fc216649ddb40763963140eac3eb95890b32486 authored by Cheng Chang on 20 March 2020, 23:15:40 UTC, committed by Facebook GitHub Bot on 20 March 2020, 23:33:26 UTC
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
1 parent 5fd152b
Tip revision: 19076c95aa2bcee55c26fcf0960cc844ad86ee9c authored by Levi Tamasi on 21 January 2021, 22:18:25 UTC
Update HISTORY.md for PR 7888 (#7890)
Update HISTORY.md for PR 7888 (#7890)
Tip revision: 19076c9
| File | Mode | Size |
|---|---|---|
| .circleci | ||
| buckifier | ||
| build_tools | ||
| cache | ||
| cmake | ||
| coverage | ||
| db | ||
| db_stress_tool | ||
| docs | ||
| env | ||
| examples | ||
| file | ||
| hdfs | ||
| include | ||
| java | ||
| logging | ||
| memory | ||
| memtable | ||
| monitoring | ||
| options | ||
| port | ||
| table | ||
| test_util | ||
| third-party | ||
| tools | ||
| trace_replay | ||
| util | ||
| utilities | ||
| .clang-format | -rw-r--r-- | 138 bytes |
| .gitignore | -rw-r--r-- | 939 bytes |
| .lgtm.yml | -rw-r--r-- | 67 bytes |
| .travis.yml | -rw-r--r-- | 6.4 KB |
| .watchmanconfig | -rw-r--r-- | 130 bytes |
| AUTHORS | -rw-r--r-- | 322 bytes |
| CMakeLists.txt | -rw-r--r-- | 41.0 KB |
| CODE_OF_CONDUCT.md | -rw-r--r-- | 3.3 KB |
| CONTRIBUTING.md | -rw-r--r-- | 706 bytes |
| COPYING | -rw-r--r-- | 17.7 KB |
| DEFAULT_OPTIONS_HISTORY.md | -rw-r--r-- | 1.5 KB |
| DUMP_FORMAT.md | -rw-r--r-- | 763 bytes |
| HISTORY.md | -rw-r--r-- | 108.6 KB |
| INSTALL.md | -rw-r--r-- | 7.5 KB |
| LANGUAGE-BINDINGS.md | -rw-r--r-- | 1.1 KB |
| LICENSE.Apache | -rw-r--r-- | 11.1 KB |
| LICENSE.leveldb | -rw-r--r-- | 1.5 KB |
| Makefile | -rw-r--r-- | 75.5 KB |
| README.md | -rw-r--r-- | 1.8 KB |
| ROCKSDB_LITE.md | -rw-r--r-- | 1.0 KB |
| TARGETS | -rw-r--r-- | 36.6 KB |
| USERS.md | -rw-r--r-- | 6.8 KB |
| Vagrantfile | -rw-r--r-- | 1017 bytes |
| WINDOWS_PORT.md | -rw-r--r-- | 12.5 KB |
| appveyor.yml | -rw-r--r-- | 3.1 KB |
| defs.bzl | -rw-r--r-- | 1.9 KB |
| issue_template.md | -rw-r--r-- | 294 bytes |
| src.mk | -rw-r--r-- | 34.8 KB |
| thirdparty.inc | -rw-r--r-- | 7.8 KB |
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