MDEV-32777 DDL operations very slow under macOS #3136
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macOS is a development platform for our product but calls to fcntl(F_FULLFSYNC) are too slow for developer needs. macOS offers at least three different disk flush calls, making tradeoffs between reliability and performance (see analysis notes on this MDEV). On macOS only and as a compromise, we will back out the change to call fcntl(F_FULLFSYNC), sacrificing a full flush in favor of more performant writes.