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From Daniel Połaczański <dpolaczan...@gmail.com>
Subject WAL Fsync - how do you live without it
Date Thu, 07 Dec 2017 23:37:55 GMT
fsync mode on WAL is not supported currenlty. So theoritically it is
possible that in case of power failure the data is lost because DataNodes
didn't flush it to physical disk.

I know that probability is small and data center should have additional
power source, but still it is possible. How do you deal with it? Do you
care about it? How to check after the disaster later from which moment the
data is lost? How often DataNodes flush buffers to disk?
What is your solution?


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