On 5-Dec-09, at 8:32 AM, nxyyt wrote:
Thank you very much for your quick response.
My question is I want to figure out whether there is data loss
after power outage. I have replicas on other machines so I can
recovery from the data loss. But I need a way to know whether there
is data loss without comparing the different data replicas.
I suppose if I append a footer to the end of file before I close
it, I can detect the data loss by validating the footer. Is it a
work aroud for me ? Or is there a better alternative? In my
scenario, the file is append-only, no in-place overwrite.
You seem to be looking for fsync() and/or fdatasync(); or, take
advantage of existing systems with durable commits (e.g. [R]DBMS).
--Toby
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