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由 sdong 提交于
Summary: WritableFile::SetPreallocationBlockSize() requires parameter as size_t, and options used in DBImpl::GetWalPreallocateBlockSize() are all size_t. WritableFile::SetPreallocationBlockSize() should return size_t to avoid build break if size_t is not uint64_t. Test Plan: Run existing tests. Reviewers: andrewkr, IslamAbdelRahman, yiwu Reviewed By: yiwu Subscribers: leveldb, andrewkr, dhruba Differential Revision: https://reviews.facebook.net/D64137
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