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

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Maysam Yabandeh 54d94e9c2c PinnableSlice ... Summary: Currently the point lookup values are copied to a string provided by the user. This incures an extra memcpy cost. This patch allows doing point lookup via a PinnableSlice which pins the source memory location (instead of copying their content) and releases them after the content is consumed by the user. The old API of Get(string) is translated to the new API underneath. Here is the summary for improvements: 1. value 100 byte: 1.8% regular, 1.2% merge values 2. value 1k byte: 11.5% regular, 7.5% merge values 3. value 10k byte: 26% regular, 29.9% merge values The improvement for merge could be more if we extend this approach to pin the merge output and delay the full merge operation until the user actually needs it. We have put that for future work. PS: Sometimes we observe a small decrease in performance when switching from t5452014 to this patch but with the old Get(string) API. The difference is a little and could be noise. More importantly it is safely cancelled Closes https://github.com/facebook/rocksdb/pull/1732 Differential Revision: D4374613 Pulled By: maysamyabandeh fbshipit-source-id: a077f1a		8 years ago
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backupable	Fix backupable db test	8 years ago
blob_db	Support SST files with Global sequence numbers [reland]	8 years ago
checkpoint	Always fsync the file after file copying	8 years ago
compaction_filters	Updated all copyright headers to the new format.	9 years ago
convenience	Updated all copyright headers to the new format.	9 years ago
date_tiered	DeleteRange user iterator support	8 years ago
document	PinnableSlice	8 years ago
geodb	Updated all copyright headers to the new format.	9 years ago
leveldb_options	Updated all copyright headers to the new format.	9 years ago
lua	rocks_lua_compaction_filter: add unused attribute to a variable	8 years ago
memory	Disable auto compactions in memory_test and re-enable the test (#1408)	8 years ago
merge_operators	Introduce FullMergeV2 (eliminate memcpy from merge operators)	9 years ago
option_change_migration	option_change_migration_test: force full compaction when needed	8 years ago
options	Only cache level 0 indexes and filter when opening table reader	9 years ago
persistent_cache	persistent_cache: fix two timer	8 years ago
redis	Eliminate use of 'using namespace std'. Also remove a number of ADL references to std functions.	9 years ago
simulator_cache	Print cache options to info log	8 years ago
spatialdb	fix wrong assignment of level0_stop_writes_trigger in spatialdb (#1061)	9 years ago
table_properties_collectors	Updated all copyright headers to the new format.	9 years ago
transactions	gcc-7 requires include <functional> for std::function	8 years ago
ttl	PinnableSlice	8 years ago
write_batch_with_index	Avoid calling GetDBOptions() inside GetFromBatchAndDB()	8 years ago
col_buf_decoder.cc	Fix clang on macOS	9 years ago
col_buf_decoder.h	Fix clang build failure and refactor unit test	9 years ago
col_buf_encoder.cc	Fix travis (compile for clang < 3.9)	8 years ago
col_buf_encoder.h	Fix clang build failure and refactor unit test	9 years ago
column_aware_encoding_exp.cc	Support ZSTD with finalized format	8 years ago
column_aware_encoding_test.cc	Fix clang build failure and refactor unit test	9 years ago
column_aware_encoding_util.cc	Fix Windows build issues (#1253)	9 years ago
column_aware_encoding_util.h	Remove ImmutableCFOptions from public API	8 years ago
env_librados.cc	Add EnvLibrados - RocksDB Env of RADOS (#1222)	9 years ago
env_librados.md	Add EnvLibrados - RocksDB Env of RADOS (#1222)	9 years ago
env_librados_test.cc	Add EnvLibrados - RocksDB Env of RADOS (#1222)	9 years ago
env_mirror.cc	direct io write support	8 years ago
env_mirror_test.cc	env: add EnvMirror	9 years ago
env_registry.cc	Env registry for URI-based Env selection [pluggable Env part 1]	9 years ago
env_registry_test.cc	Env registry for URI-based Env selection [pluggable Env part 1]	9 years ago
merge_operators.h	Introduce FullMergeV2 (eliminate memcpy from merge operators)	9 years ago
util_merge_operators_test.cc	Introduce FullMergeV2 (eliminate memcpy from merge operators)	9 years ago