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由 Feng Zhu 提交于
Summary: When compression is enabled, and blocksize is not too big, use the space in stack to hold bytes read from block. Bencmark: base version: commit 8f09d53f malloc: 1.30% -> 0.98% free: 1.49% -> 1.07% Test Plan: make all check Reviewers: ljin, yhchiang, dhruba, igor, sdong Reviewed By: sdong Subscribers: leveldb Differential Revision: https://reviews.facebook.net/D20679
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