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由 Igor Canadi 提交于
Summary: Developing a capability for storing values on external backing file(s). This is just a highly unoptimized first pass - supports: 1) Allocating some portion of external file to be used to store value 2) Freeing the range, enabling it to be reused by other values As next steps, I plan to: 1) Create some kind of stress testing. Once I can measure stuff, I can focus on optimizing. 2) Optimize locking. 3) Optimize freelist data structure. Currently we have O(n) for both freeing and allocation. 4) Figure out how to do recovery. Test Plan: Created a unit test. Reviewers: dhruba, haobo, kailiu Reviewed By: dhruba CC: leveldb Differential Revision: https://reviews.facebook.net/D13389
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