Siying Dong 4624edc440 RocksDBOptionsParser::Parse()'s ignore_unknown_options argument only ingores options from higher version.
Summary:
RocksDB should always be able to parse an option file generated using the same or lower version. Unknown option should only happen if it is from a higher version. Change the behavior of RocksDBOptionsParser::Parse()'s behavior with ignore_unknown_options=true so that unknown option from a lower or the same version will never be skipped.
Closes https://github.com/facebook/rocksdb/pull/3527

Differential Revision: D7048851

Pulled By: siying

fbshipit-source-id: e261caea12f6515611a4a29f39acf2b619df2361
2018-02-22 13:28:12 -08:00
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