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由 Andrew Kryczka 提交于
Summary: Previously it only printed percentiles, even though our histogram keeps track of count and sum (and more). There have been many times we want to know more than the percentiles. For example, we currently want sum of "rocksdb.compression.times.nanos" and sum of "rocksdb.decompression.times.nanos", which would allow us to know the relative cost of compression vs decompression. This PR adds count and sum to the string printed by `StatisticsImpl::ToString`. This is a bit risky as there are definitely parsers assuming the old format. I will mention it in HISTORY.md and hope for the best... Closes https://github.com/facebook/rocksdb/pull/3863 Differential Revision: D8038831 Pulled By: ajkr fbshipit-source-id: 0465b72e4b0cbf18ef965f4efe402601d16d5b5c
508a09fd
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