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

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Cheng Chang 40497a875a Reduce memory copies when fetching and uncompressing blocks from SST files (#6689) ... Summary: In https://github.com/facebook/rocksdb/pull/6455, we modified the interface of `RandomAccessFileReader::Read` to be able to get rid of memcpy in direct IO mode. This PR applies the new interface to `BlockFetcher` when reading blocks from SST files in direct IO mode. Without this PR, in direct IO mode, when fetching and uncompressing compressed blocks, `BlockFetcher` will first copy the raw compressed block into `BlockFetcher::compressed_buf_` or `BlockFetcher::stack_buf_` inside `RandomAccessFileReader::Read` depending on the block size. then during uncompressing, it will copy the uncompressed block into `BlockFetcher::heap_buf_`. In this PR, we get rid of the first memcpy and directly uncompress the block from `direct_io_buf_` to `heap_buf_`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6689 Test Plan: A new unit test `block_fetcher_test` is added. Reviewed By: anand1976 Differential Revision: D21006729 Pulled By: cheng-chang fbshipit-source-id: 2370b92c24075692423b81277415feb2aed5d980		5 years ago
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cf_options.cc	Add a ConfigOptions for use in comparing objects and converting to/from strings (#6389)	5 years ago
cf_options.h	Make options.bottommost_compression, compression_opts and bottommost_compression_opts dynamically changeable. (#6615)	5 years ago
db_options.cc	Set max_background_flushes dynamically (#6701)	5 years ago
db_options.h	Set max_background_flushes dynamically (#6701)	5 years ago
options.cc	Implement deadline support for MultiGet (#6710)	5 years ago
options_helper.cc	Add a ConfigOptions for use in comparing objects and converting to/from strings (#6389)	5 years ago
options_helper.h	Reduce memory copies when fetching and uncompressing blocks from SST files (#6689)	5 years ago
options_parser.cc	Add a ConfigOptions for use in comparing objects and converting to/from strings (#6389)	5 years ago
options_parser.h	Add a ConfigOptions for use in comparing objects and converting to/from strings (#6389)	5 years ago
options_sanity_check.cc	Add a ConfigOptions for use in comparing objects and converting to/from strings (#6389)	5 years ago
options_sanity_check.h	Add a ConfigOptions for use in comparing objects and converting to/from strings (#6389)	5 years ago
options_settable_test.cc	Fix memory corruption caused by new test in options_settable_test (#6676)	5 years ago
options_test.cc	Add a ConfigOptions for use in comparing objects and converting to/from strings (#6389)	5 years ago
options_type.h	Move the OptionTypeMap code closer to home (#6198)	5 years ago