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

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Zhongyi Xie 671d15cbdd Persistent Stats: persist stats history to disk (#5046) ... Summary: This PR continues the work in https://github.com/facebook/rocksdb/pull/4748 and https://github.com/facebook/rocksdb/pull/4535 by adding a new DBOption `persist_stats_to_disk` which instructs RocksDB to persist stats history to RocksDB itself. When statistics is enabled, and both options `stats_persist_period_sec` and `persist_stats_to_disk` are set, RocksDB will periodically write stats to a built-in column family in the following form: key -> (timestamp in microseconds)#(stats name), value -> stats value. The existing API `GetStatsHistory` will detect the current value of `persist_stats_to_disk` and either read from in-memory data structure or from the hidden column family on disk. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5046 Differential Revision: D15863138 Pulled By: miasantreble fbshipit-source-id: bb82abdb3f2ca581aa42531734ac799f113e931b		5 years ago
..
db_impl.cc	Persistent Stats: persist stats history to disk (#5046)	5 years ago
db_impl.h	Persistent Stats: persist stats history to disk (#5046)	5 years ago
db_impl_compaction_flush.cc	Potential fix for stress test failure due to "SST file ahead of WAL" error (#5412)	5 years ago
db_impl_debug.cc	Persistent Stats: persist stats history to disk (#5046)	5 years ago
db_impl_experimental.cc	simplify include directive involving inttypes (#5402)	5 years ago
db_impl_files.cc	simplify include directive involving inttypes (#5402)	5 years ago
db_impl_open.cc	Persistent Stats: persist stats history to disk (#5046)	5 years ago
db_impl_readonly.cc	Make format	5 years ago
db_impl_readonly.h	Organizing rocksdb/db directory	5 years ago
db_impl_secondary.cc	Handle missing WAL in secondary mode (#5323)	5 years ago
db_impl_secondary.h	Organizing rocksdb/db directory	5 years ago
db_impl_write.cc	WritePrepared: reduce prepared_mutex_ overhead (#5420)	5 years ago
db_secondary_test.cc	Improve memtable earliest seqno assignment for secondary instance (#5413)	5 years ago