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                                            Daniel Tan

Func 'doFullWriteBack' in place update mmap file, will corrupt file when func is not finished but process exit.

Corrupting the file sounds like a red flag. Writing to a tmp file and renames it is a better solution, this also enable us to "rollback" should the write failed.

Func 'doFullWriteBack' in place update mmap file, will corrupt file when func is not finished but process exit.

How about keeping 2 files and versions it, so we don't delete any file in this case. What's left is to decide which version to use then.