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From "Hanson Char (JIRA)" <j...@apache.org>
Subject [jira] Commented: (NET-160) FTP Client API Hangs - Attached Scenario.
Date Sat, 22 Dec 2007 15:35:43 GMT

    [ https://issues.apache.org/jira/browse/NET-160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12554132
] 

Hanson Char commented on NET-160:
---------------------------------

>The code I am writing is designed to constantly poll a series of ftp servers 
>and download files of interest as they are discovered.

Do you construct a new instance of FTPClient every time you poll the ftp servers and download
files, or do you reuse the same instance ?

> FTP Client API Hangs - Attached Scenario.
> -----------------------------------------
>
>                 Key: NET-160
>                 URL: https://issues.apache.org/jira/browse/NET-160
>             Project: Commons Net
>          Issue Type: Bug
>    Affects Versions: 1.4
>         Environment: Suse Enterprise Linux 9.0, Intel
>            Reporter: Lvenkataraman
>
> FTP client hangs with the following error.   Here is the truss output. The client hangs
indefinitely and no work is being done other than this error when you truss the process. 
I use Java 1.5 to run this.  We wrote a long-running ftp daemon and this happens after 20-23
hours of continuous running.
> Here is the code to pull files from the ftp server. This one lists files that are received
after this particular "incal" time (currently it lists but the intention is to implement an
incremental download).  We initially thought doing periodic noop would keep the client alive
by sending dummy commands to the server. But we found this probelm still occurs.
> public void ListIncrementalFiles (String directory, Calendar incal)
> 	{
> 		try 
> 		{
> 			FTPFile[] files = listFiles(directory);
> 			
> 			int total_files = 0;
> 					
> 			System.out.println("FileName\tFileSize\t\tDate Time Stamp");
> 			for (int i = 0; i < files.length; i++)
> 			{
> 												
> 					FTPFile file = files[i];
> 					if ((i % 1000) == 0)
> 					{
> 						System.out.println("noop occurred at this instance---> " + i + "\n");
> 						noop();
> 					}
> 							
> 					if (file.isFile())
> 					{
> 						Calendar c = file.getTimestamp();
> 												
> 						if (c.after(incal) || c.equals(incal))
> 						{
> 								
> 								System.out.println(file.getName() + "\t" + file.getSize() + "\t\t" + c.getTime());
> 								total_files++;
> 						}
> 					 }
>     				
> 			}
> 			System.out.println("Total Files in the listing ----> " + total_files);
> 		} 
> 		catch (Exception e)
> 		{
> 			System.out.println("FTP Getfiles exception occured");
> 			e.printStackTrace();
> 		}
>     
> 	}
> ---------------------------------------------------------------------------------------------------------------------------------Truss
output begins--------------------------------------------------------
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /6:	lwp_cond_wait(0x00035F08, 0x00035EF0, 0xB477FBE0, 0) Err#62 ETIME
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /9:	lwp_park(0x00000000, 0)		(sleeping...)
> /3:	lwp_cond_wait(0x000B77C0, 0x000B77A8, 0x00000000, 0) (sleeping...)
> /8:	lwp_cond_wait(0x0014A908, 0x0014A8F0, 0x00000000, 0) (sleeping...)
> /10:	lwp_cond_wait(0x000366E8, 0x000366D0, 0x00000000, 0) (sleeping...)
> /1:	pollsys(0x00000000, 0, 0xFFBFEB60, 0x00000000) (sleeping...)
> /11:	lwp_cond_wait(0x00036778, 0x00036760, 0x00000000, 0) (sleeping...)
> /4:	lwp_cond_wait(0x000B77C0, 0x000B77A8, 0x00000000, 0) (sleeping...)
> /12:	lwp_cond_wait(0x00036778, 0x00036760, 0x00000000, 0) (sleeping...)
> /2:	lwp_cond_wait(0x000B77C0, 0x000B77A8, 0x00000000, 0) (sleeping...)
> /7:	lwp_cond_wait(0x00149F98, 0x00149F80, 0x00000000, 0) (sleeping...)
> /5:	lwp_cond_wait(0x000B77C0, 0x000B77A8, 0x00000000, 0) (sleeping...)
> /13:	lwp_cond_wait(0x00034958, 0x00034940, 0x00000000, 0) (sleeping...)
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /6:	lwp_cond_wait(0x00035F08, 0x00035EF0, 0xB477FBE0, 0) Err#62 ETIME
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /6:	lwp_cond_wait(0x00035F08, 0x00035EF0, 0xB477FBE0, 0) Err#62 ETIME
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /6:	lwp_cond_wait(0x00035F08, 0x00035EF0, 0xB477FBE0, 0) Err#62 ETIME
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /6:	lwp_cond_wait(0x00035F08, 0x00035EF0, 0xB477FBE0, 0) Err#62 ETIME
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /6:	lwp_cond_wait(0x00035F08, 0x00035EF0, 0xB477FBE0, 0) Err#62 ETIME
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /6:	lwp_cond_wait(0x00035F08, 0x00035EF0, 0xB477FBE0, 0) Err#62 ETIME
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> /14:	pollsys(0x00000000, 0, 0xB3F7FC10, 0x00000000)	= 0
> ------------------------------------------------------------------------------------------Truss
output ends-------------------------------------------------------------------------------------------

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