fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

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Akanksha Mahajan 8353ae8b27 Add few optimizations in async_io for short scans (#10140) ... Summary: This PR adds few optimizations for async_io for shorter scans. 1. If async_io is enabled, seek would create FilePrefetchBuffer object to fetch the data asynchronously. However `FilePrefetchbuffer::num_file_reads_` wasn't taken into consideration if it calls Next after Seek and would go for Prefetching. This PR fixes that and Next will go for prefetching only if `FilePrefetchbuffer::num_file_reads_` is greater than 2 along with if blocks are sequential. This scenario is only for implicit auto readahead. 2. For seek, when it calls TryReadFromCacheAsync to poll it makes async call as well because TryReadFromCacheAsync flow wasn't changed. So I updated to return after poll instead of further prefetching any data. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10140 Test Plan: 1. Added a unit test 2. Ran crash_test with async_io = 1 to make sure nothing crashes. Reviewed By: anand1976 Differential Revision: D37042242 Pulled By: akankshamahajan15 fbshipit-source-id: b8e6b7cb2ee0886f37a8f53951948b9084e8ffda		2 years ago
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delete_scheduler.cc	Skip directory fsync for filesystem btrfs (#8903)	3 years ago
delete_scheduler.h	Use SystemClock* instead of std::shared_ptr<SystemClock> in lower level routines (#8033)	4 years ago
delete_scheduler_test.cc	Remove own ToString() (#9955)	3 years ago
file_prefetch_buffer.cc	Add few optimizations in async_io for short scans (#10140)	2 years ago
file_prefetch_buffer.h	Add few optimizations in async_io for short scans (#10140)	2 years ago
file_util.cc	Support read rate-limiting in SequentialFileReader (#9973)	3 years ago
file_util.h	Set Read rate limiter priority dynamically and pass it to FS (#9996)	3 years ago
filename.cc	Handle "NotSupported" status by default implementation of Close() in … (#10127)	2 years ago
filename.h	Add (Live)FileStorageInfo API (#8968)	3 years ago
line_file_reader.cc	Support read rate-limiting in SequentialFileReader (#9973)	3 years ago
line_file_reader.h	Support read rate-limiting in SequentialFileReader (#9973)	3 years ago
prefetch_test.cc	Add few optimizations in async_io for short scans (#10140)	2 years ago
random_access_file_reader.cc	Provide support for IOTracing for ReadAsync API (#9833)	3 years ago
random_access_file_reader.h	Set Read rate limiter priority dynamically and pass it to FS (#9996)	3 years ago
random_access_file_reader_test.cc	Add rate limiter priority to ReadOptions (#9424)	3 years ago
read_write_util.cc	Move old files to warm tier in FIFO compactions (#8310)	3 years ago
read_write_util.h	Refactor: add LineFileReader and Status::MustCheck (#8026)	4 years ago
readahead_file_info.h	Reuse internal auto readhead_size at each Level (expect L0) for Iterations (#9056)	3 years ago
readahead_raf.cc	Make StringEnv, StringSink, StringSource use FS classes (#7786)	4 years ago
readahead_raf.h	Make StringEnv, StringSink, StringSource use FS classes (#7786)	4 years ago
sequence_file_reader.cc	Support read rate-limiting in SequentialFileReader (#9973)	3 years ago
sequence_file_reader.h	Support read rate-limiting in SequentialFileReader (#9973)	3 years ago
sst_file_manager_impl.cc	Fix race condition in SstFileManagerImpl error recovery code (#9435)	3 years ago
sst_file_manager_impl.h	Fix typo about file/sst_file_manager_impl.h (#9799)	3 years ago
writable_file_writer.cc	Fix a bug in WAL tracking (#10087)	2 years ago
writable_file_writer.h	Fix a bug in WAL tracking (#10087)	2 years ago