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

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Baptiste Lemaire 206845c057 Mempurge support for wal (#8528) ... Summary: In this PR, `mempurge` is made compatible with the Write Ahead Log: in case of recovery, the DB is now capable of recovering the data that was "mempurged" and kept in the `imm()` list of immutable memtables. The twist was to add a uint64_t to the `memtable` struct to store the number of the earliest log file containing entries from the `memtable`. When a `Flush` operation is replaced with a `MemPurge`, the `VersionEdit` (which usually contains the new min log file number to pick up for recovery and the level 0 file path of the newly created SST file) is no longer appended to the manifest log, and every time the `deleteWal` method is called, a check is made on the list of immutable memtables. This PR also includes a unit test that verifies that no data is lost upon Reopening of the database when the mempurge feature is activated. This extensive unit test includes two column families, with valid data contained in the imm() at time of "crash"/reopening (recovery). Pull Request resolved: https://github.com/facebook/rocksdb/pull/8528 Reviewed By: pdillinger Differential Revision: D29701097 Pulled By: bjlemaire fbshipit-source-id: 072a900fb6ccc1edcf5eef6caf88f3060238edf9		3 years ago
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compacted_db_impl.cc	Make backups openable as read-only DBs (#8142)	4 years ago
compacted_db_impl.h	Move compacted_db_impl.[c|h] to db/db_impl (#8082)	4 years ago
db_impl.cc	Make mempurge a background process (equivalent to in-memory compaction). (#8505)	3 years ago
db_impl.h	Delete legacy code not used any more. (#8508)	3 years ago
db_impl_compaction_flush.cc	Mempurge support for wal (#8528)	3 years ago
db_impl_debug.cc	Eliminate compiler complaining, which the return type of the function… (#8498)	3 years ago
db_impl_experimental.cc	Replace reinterpret_cast with static_cast_with_check (#7067)	4 years ago
db_impl_files.cc	Make types of Immutable/Mutable Options fields match that of the underlying Option (#8176)	4 years ago
db_impl_open.cc	Mempurge support for wal (#8528)	3 years ago
db_impl_readonly.cc	Make backups openable as read-only DBs (#8142)	4 years ago
db_impl_readonly.h	RocksJava - Add errorIfLogFileExists parameter to RocksDB.openReadOnly (#7046)	4 years ago
db_impl_secondary.cc	Mempurge support for wal (#8528)	3 years ago
db_impl_secondary.h	Implement missing Handler methods in ColumnFamilyCollector. (#8456)	3 years ago
db_impl_write.cc	Mempurge support for wal (#8528)	3 years ago