Added: Trying to recover from error state like disk-full. #428
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This is same following issue.
serf uses bufio library to write the snapshot file.
bufio library can not recover from error state like disk-full unless calling Reset() even if the amount of disk free space is increased.
https://golang.org/pkg/bufio/#Reader.Reset
But Reset() discards any buffered data, resets all state.
If the snapshot file is permissible to lose the old buffer data , this patch to fix this problem .
Best regards,