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由 Igor Canadi 提交于
Summary: When building batch group, don't actually build a new batch since it requires heavy-weight mem copy and malloc. Only store references to the batches and build the batch group without lock held. Test Plan: `make check` I am also planning to run performance tests. The workload that will benefit from this change is readwhilewriting. I will post the results once I have them. Reviewers: dhruba, haobo, kailiu Reviewed By: haobo CC: leveldb, xjin Differential Revision: https://reviews.facebook.net/D15063
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