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Expected behavior

@petermattis pointed me to this. We should sync the DB directory after ingesting an SST file to ensure that SST file can survive a system crash.

Actual behavior

The directory sync is not happening (see repro below).

Steps to reproduce the behavior

I verified with strace that there is indeed no sync on the directory after creating a file during ingestion: https://gist.github.com/ajkr/053b51bb97d5a8957136b2a8cf885c71