anand1976 d394a6bb48 Add a ticker stat for number of keys skipped during iteration ... Summary: This diff adds a new ticker stat, NUMBER_ITER_SKIP, to count the number of internal keys skipped during iteration. Keys can be skipped due to deletes, or lower sequence number, or higher sequence number than the one requested. Also, fix the issue when StatisticsData is naturally aligned on cacheline boundary, padding becomes a zero size array, which the Windows compiler doesn't like. So add a cacheline worth of padding in that case to keep it happy. We cannot conditionally add padding as gcc doesn't allow using sizeof in preprocessor directives. Closes https://github.com/facebook/rocksdb/pull/3177 Differential Revision: D6353897 Pulled By: anand1976 fbshipit-source-id: 441d5a09af9c4e22e7355242dfc0c7b27aa0a6c2		2017-11-20 21:26:37 -08:00
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rocksdb	Add a ticker stat for number of keys skipped during iteration	2017-11-20 21:26:37 -08:00