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KAFKA-3968: fsync the parent directory of a segment file when the fil…
…e is created (#10405) Kafka does not call fsync() on the directory when a new log segment is created and flushed to disk. The problem is that following sequence of calls doesn't guarantee file durability: fd = open("log", O_RDWR | O_CREATE); // suppose open creates "log" write(fd); fsync(fd); If the system crashes after fsync() but before the parent directory has been flushed to disk, the log file can disappear. This PR is to flush the directory when flush() is called for the first time. Reviewers: Jun Rao <junrao@gmail.com>
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