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由 Siying Dong 提交于
Summary: Previously, when DB write buffer size triggers, we always pick the CF with most data in its memtable to flush. This approach can minimize total flush happens. Change the behavior to always pick the oldest unflushed CF, which makes it the same behavior when max_total_wal_size hits. This approach will minimize size used by max_total_wal_size. Closes https://github.com/facebook/rocksdb/pull/1987 Differential Revision: D4703214 Pulled By: siying fbshipit-source-id: 9ff8b09
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