Explicitly declare atomic flush incompatible with pipelined write (#5860)
Summary: Atomic flush is incompatible with pipelined write. At least now. If pipelined write is enabled, a thread performing write can exit the write thread and start inserting into memtables. Consequently a thread performing flush will enter write thread and race with memtable insertion by the former. This will cause undefined result in terms of data persistence. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5860 Test Plan: ``` $make all && make check ``` Differential Revision: D17638944 Pulled By: riversand963 fbshipit-source-id: abc578dc49a5dbe41bc5adcecf448f8e042a6d49
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