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PORuby Net::FTP Timeout Threads
 

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    <p>I was trying to speed up multiple FTP downloads by using threaded FTP connections. My problem is that I always have threads hang. I am looking for a clean way of either telling FTP it needs to retry the ftp transaction, or at least knowing when the FTP connection is hanging.</p> <p>In the code below I am threading 5/6 separate FTP connections where each thread has a list of files it is expected to download. When the script completes, a few of the threads hang and can not be joined. I am using the variable @last_updated to represent the last successful download time. If the current time + 20 seconds exceeds @last_updated, kill the remaining threads. Is there a better way?</p> <pre><code>threads = [] max_thread_pool = 5 running_threads = 0 Thread.abort_on_exception = true existing_file_count = 0 files_downloaded = 0 errors = [] missing_on_the_server = [] @last_updated = Time.now if ids.length &gt; 0 ids.each_slice(ids.length / max_thread_pool) do |id_set| threads &lt;&lt; Thread.new(id_set) do |t_id_set| running_threads += 1 thread_num = running_threads thread_num.freeze puts "making thread # #{thread_num}" begin ftp = Net::FTP.open(@remote_site) ftp.login(@remote_user, @remote_password) ftp.binary = true #ftp.debug_mode = true ftp.passive = false rescue raise "Could not establish FTP connection" end t_id_set.each do |id| @last_updated = Time.now rmls_path = "/_Photos/0#{id[0,2]}00000/#{id[2,1]}0000/#{id[3,1]}000/#{id}-1.jpg" local_path = "#{@photos_path}/01/#{id}-1.jpg" progress += 1 unless File.exist?(local_path) begin ftp.getbinaryfile(rmls_path, local_path) puts "ftp reponse: #{ftp.last_response}" # find the percentage of progress just for fun files_downloaded += 1 p = sprintf("%.2f", ((progress.to_f / total) * 100)) puts "Thread # #{thread_num} &gt; %#{p} &gt; #{progress}/#{total} &gt; Got file: #{local_path}" rescue errors &lt;&lt; "#{thread_num} unable to get file &gt; ftp response: #{ftp.last_response}" puts errors.last if ftp.last_response_code.to_i == 550 # Add the missing file to the missing list missing_on_the_server &lt;&lt; errors.last.match(/\d{5,}-\d{1,2}\.jpg/)[0] end end else puts "found file: #{local_path}" existing_file_count += 1 end end puts "closing FTP connection #{thread_num}" ftp.close end # close thread end end # If @last_updated has not been updated on the server in over 20 seconds, wait 3 seconds and check again while Time.now &lt; @last_updated + 20 do sleep 3 end # threads are hanging so joining the threads does not work. threads.each { |t| t.kill } </code></pre>
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