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From "Jeff Cliff (JIRA)" <j...@apache.org>
Subject [jira] Updated: (NET-160) FTP Client API Hangs - Attached Scenario.
Date Wed, 31 Dec 2008 15:40:47 GMT

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

Jeff Cliff updated NET-160:
---------------------------

    Attachment: __getReply

This is the second half of what I changed to make things work.  I'm not 100% entirely sure
that this follows the letter of the API, since a process may block for reasons unrelated to
the problems discussed in this thread(and in doing so will trigger this modified __getReply()
function to throw an exception)---but the exception is easily caught and it *does* throw an
exception when otherwise unrecoverable problems do occur.  At the cost of a tighter coupling
between clients and class FTP, class FTP becomes more robust.

> 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
>         Attachments: __getReply, Util.java
>
>
> 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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