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

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Andrew Kryczka a4a4a2dabd dedup ReadOptions in iterator hierarchy (#7210) ... Summary: Previously, a `ReadOptions` object was stored in every `BlockBasedTableIterator` and every `LevelIterator`. This redundancy consumes extra memory, resulting in the `Arena` making more allocations, and iteration observing worse cache performance. This PR migrates callers of `NewInternalIterator()` and `MakeInputIterator()` to provide a `ReadOptions` object guaranteed to outlive the returned iterator. When the iterator's lifetime will be managed by the user, this lifetime guarantee is achieved by storing the `ReadOptions` value in `ArenaWrappedDBIter`. Then, sub-iterators of `NewInternalIterator()` and `MakeInputIterator()` can hold a reference-to-const `ReadOptions`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7210 Test Plan: - `make check` under ASAN and valgrind - benchmark: on a DB with 2 L0 files and 3 L1+ levels, this PR reduced `Arena` allocation 4792 -> 4160 bytes. Reviewed By: anand1976 Differential Revision: D22861323 Pulled By: ajkr fbshipit-source-id: 54aebb3e89c872eeab0f5793b4b6e42878d093ce		4 years ago
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db_impl.cc	dedup ReadOptions in iterator hierarchy (#7210)	4 years ago
db_impl.h	dedup ReadOptions in iterator hierarchy (#7210)	4 years ago
db_impl_compaction_flush.cc	Make max_subcompactions dynamically changeable (#7159)	4 years ago
db_impl_debug.cc	Replace reinterpret_cast with static_cast_with_check (#7067)	4 years ago
db_impl_experimental.cc	Replace reinterpret_cast with static_cast_with_check (#7067)	4 years ago
db_impl_files.cc	Make env*_test work with ASSERT_STATUS_CHECKED (#7176)	4 years ago
db_impl_open.cc	Auto resume the DB from Retryable IO Error (#6765)	4 years ago
db_impl_readonly.cc	dedup ReadOptions in iterator hierarchy (#7210)	4 years ago
db_impl_readonly.h	API change: DB::OpenForReadOnly will not write to the file system unless create_if_missing is true (#6900)	4 years ago
db_impl_secondary.cc	dedup ReadOptions in iterator hierarchy (#7210)	4 years ago
db_impl_secondary.h	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	5 years ago
db_impl_write.cc	Auto resume the DB from Retryable IO Error (#6765)	4 years ago
db_secondary_test.cc	More Makefile Cleanup (#7097)	4 years ago