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

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Cheng Chang 91b7553293 Enable IO Uring in MultiGet in direct IO mode (#6815) ... Summary: Currently, in direct IO mode, `MultiGet` retrieves the data blocks one by one instead of in parallel, see `BlockBasedTable::RetrieveMultipleBlocks`. Since direct IO is supported in `RandomAccessFileReader::MultiRead` in https://github.com/facebook/rocksdb/pull/6446, this PR applies `MultiRead` to `MultiGet` so that the data blocks can be retrieved in parallel. Also, in direct IO mode and when data blocks are compressed and need to uncompressed, this PR only allocates one continuous aligned buffer to hold the data blocks, and then directly uncompress the blocks to insert into block cache, there is no longer intermediate copies to scratch buffers. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6815 Test Plan: 1. added a new unit test `BlockBasedTableReaderTest::MultiGet`. 2. existing unit tests and stress tests contain tests against `MultiGet` in direct IO mode. Reviewed By: anand1976 Differential Revision: D21426347 Pulled By: cheng-chang fbshipit-source-id: b8446ae0e74152444ef9111e97f8e402ac31b24f		5 years ago
..
delete_scheduler.cc	Create a thread in DeleteScheduler only when rate limit enabled (#6564)	5 years ago
delete_scheduler.h	Create a thread in DeleteScheduler only when rate limit enabled (#6564)	5 years ago
delete_scheduler_test.cc	fix some spelling typos (#6464)	5 years ago
file_prefetch_buffer.cc	Pass a timeout to FileSystem for random reads (#6751)	5 years ago
file_prefetch_buffer.h	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	5 years ago
file_util.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	5 years ago
file_util.h	Pass a timeout to FileSystem for random reads (#6751)	5 years ago
filename.cc	Find/purge obsolete blob files (#6807)	5 years ago
filename.h	Find/purge obsolete blob files (#6807)	5 years ago
random_access_file_reader.cc	sst_dump to reduce number of file reads (#6836)	5 years ago
random_access_file_reader.h	Pass a timeout to FileSystem for random reads (#6751)	5 years ago
random_access_file_reader_test.cc	Enable IO Uring in MultiGet in direct IO mode (#6815)	5 years ago
read_write_util.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	5 years ago
read_write_util.h	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	5 years ago
readahead_raf.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	5 years ago
readahead_raf.h	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	5 years ago
sequence_file_reader.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	5 years ago
sequence_file_reader.h	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	5 years ago
sst_file_manager_impl.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	5 years ago
sst_file_manager_impl.h	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	5 years ago
writable_file_writer.cc	Move checksum calculation ahead of memory copy (#6844)	5 years ago
writable_file_writer.h	prototype status check enforcement (#6798)	5 years ago