use xattr to trace file instead of inode #62
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When we trace file with inode, it will confuse sincedb if filesystem reuse an inode, which cause the file truncated random
https://logstash.jira.com/browse/LOGSTASH-685
Since we hard to prevent filesystem reuse a inode, we could use another fileId like windows did
http://stackoverflow.com/questions/16069898/can-inode-and-crtime-be-used-as-a-unique-file-identifier
As you know, most modern filesystem support
Extended File Attributes, we could generate a UUID for file and store it in xattrs, which will associated with inodes (files, directories, symlinks, etc).https://en.wikipedia.org/wiki/Extended_file_attributes
http://manpages.ubuntu.com/manpages/precise/man2/getxattr.2.html