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

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Zhongyi Xie c4f5d0aa15 add GetStatsHistory to retrieve stats snapshots (#4748) ... Summary: This PR adds public `GetStatsHistory` API to retrieve stats history in the form of an std map. The key of the map is the timestamp in microseconds when the stats snapshot is taken, the value is another std map from stats name to stats value (stored in std string). Two DBOptions are introduced: `stats_persist_period_sec` (default 10 minutes) controls the intervals between two snapshots are taken; `max_stats_history_count` (default 10) controls the max number of history snapshots to keep in memory. RocksDB will stop collecting stats snapshots if `stats_persist_period_sec` is set to 0. (This PR is the in-memory part of https://github.com/facebook/rocksdb/pull/4535) Pull Request resolved: https://github.com/facebook/rocksdb/pull/4748 Differential Revision: D13961471 Pulled By: miasantreble fbshipit-source-id: ac836d401ecb84ea92216bf9966f969dedf4ad04		5 years ago
..
cf_options.cc	add whole key bloom filter support in memtables (#4985)	5 years ago
cf_options.h	add whole key bloom filter support in memtables (#4985)	5 years ago
db_options.cc	add GetStatsHistory to retrieve stats snapshots (#4748)	5 years ago
db_options.h	add GetStatsHistory to retrieve stats snapshots (#4748)	5 years ago
options.cc	add whole key bloom filter support in memtables (#4985)	5 years ago
options_helper.cc	add GetStatsHistory to retrieve stats snapshots (#4748)	5 years ago
options_helper.h	Add DataBlockIndexType option in BlockBasedTableOptions (#4150)	6 years ago
options_parser.cc	Deprecate ttl option from CompactionOptionsFIFO (#4965)	5 years ago
options_parser.h	WritePrepared Txn: Optimize for recoverable state	7 years ago
options_sanity_check.cc	Change RocksDB License	7 years ago
options_sanity_check.h	Change RocksDB License	7 years ago
options_settable_test.cc	add GetStatsHistory to retrieve stats snapshots (#4748)	5 years ago
options_test.cc	add GetStatsHistory to retrieve stats snapshots (#4748)	5 years ago