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.
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