in_tail: Reduce startup time

[t-osakada]

Currently, in_tail startup process take very long time when reading huge files.
Would you consider adding an option like skip_refresh_on_startup :bool to reduce startup time?

ex.

     def start
       super

       if @pos_file
         @pf_file = File.open(@pos_file, File::RDWR|File::CREAT|File::BINARY, @file_perm)
         @pf_file.sync = true
         @pf = PositionFile.parse(@pf_file)
       end

-      refresh_watchers
+      refresh_watchers unless @skip_refresh_on_startup
       timer_execute(:in_tail_refresh_watchers, @refresh_interval, &method(:refresh_watchers))
     end

[repeatedly]

It seems no problem for me.

[t-osakada]

Thanks!