Change FLUSHALL/FLUSHDB SYNC to run as blocking ASYNC (#13167)
# Overview Users utilize the `FLUSHDB SYNC` and `FLUSHALL SYNC` commands for a variety of reasons. The main issue with this command is that if the database becomes substantial in size, the server will be unresponsive for an extended period. Other than freezing application traffic, this may also lead some clients making incorrect judgments about the server's availability. For instance, a watchdog may erroneously decide to terminate the process, resulting in potential adverse outcomes. While a `FLUSH* ASYNC` can address these issues, it might not be used for two reasons: firstly, it's not the default, and secondly, in some cases, the client issuing the flush wants to wait for its completion before repopulating the database. Between the option of triggering FLUSH* asynchronously in the background without indication for completion versus running it synchronously in the foreground by the main thread, there is another more ...
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