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18df47b79a
Summary: In some places we have NotFound status created with empty message, but it doesn't avoid a malloc. With this patch, the malloc is avoided for that case. The motivation of it is that I found in db_bench readrandom test when all keys are not existing, about 4% of the total running time is spent on malloc of Status, plus a similar amount of CPU spent on free of them, which is not necessary. Test Plan: make all check Reviewers: dhruba, haobo, igor Reviewed By: haobo CC: leveldb Differential Revision: https://reviews.facebook.net/D14691