Logstash and file input plugin on Windows

Apparently, the file input plugin does not work on Windows. Logstash keeps reloading the same lines over and over, thus duplicating documents in the output sink. (See LOGSTASH-429. In other words, the tailing process that follows new lines in the input file is broken.

The solution is simple: download the zipped patched Ruby Filewatch from Github, and unzip it into logstash/vendor/bundle/jruby/1.9/gems/filewatch-0.5.1/lib folder. (There are two new files: JRubyFileExtension.jar and filewatch/winhelper.rb.)

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