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由 Dhruba Borthakur 提交于
Flush was hanging because the configured options specified that more than 1 memtable need to be merged. Summary: There is an config option called Options.min_write_buffer_number_to_merge that specifies the minimum number of write buffers to merge in memory before flushing to a file in L0. But in the the case when the db is being closed, we should not be using this config, instead we should flush whatever write buffers were available at that time. Test Plan: Unit test attached. Reviewers: haobo, emayanke Reviewed By: haobo CC: leveldb Differential Revision: https://reviews.facebook.net/D12717
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