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  1. Couchbase Server
  2. MB-62751

Skip hash table lookup in GetByPrefix when dedup is not needed

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      When a prefix to be read is only present in a single sstable, it is wasteful to insert every entry to the hash table. The hash table insertion for dedup consumes significant CPU (20+%). See the attached CPU profile.

      We can skip hash table insertion when the the entire prefix is read from a single sstable and no merge is required. This should improve performance in those cases.

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            anirudh.rowjee Anirudh Rowjee
            sarath Sarath Lakshman
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