RE: losing an FTP connection

[Tim McCarthy <timm@xxxxxxxxxxxx>]

The data is sent in packets as a stream - there's no relationship
between "records" and what goes in a packet. In the event of a dropped
connection the remote will very probably receive an incomplete "record".
How the remote client or server handles this will vary depending on how
they view the data (i.e as a record set or a stream). If the remote is
an AS400 writing to a database file in non-binary mode then it will be
scanning for record seps and will probably not write out a partial
record but this behaviour would be impossible to predict generally.    


TrailBlazer Systems, Inc.
http://www.as400ftp.com
AS/400 Communications & E-Commerce Solutions

Chaos, panic and disorder...my work here is done.


> -----Original Message-----
> From: Jodi_Walker@ccmail.columbia.com
> [SMTP:Jodi_Walker@ccmail.columbia.com]
> Sent: Wednesday, February 28, 2001 12:15 PM
> To:   MIDRANGE-L@midrange.com
> Subject:      losing an FTP connection
> 
>      A quick question for which my quick search of the archives & IBM 
>      publications turned up no answer.  I probably missed it, but I am
> 
>      pressed for time.
>      
>      If an FTP is started from a 400 and during the transfer, the 
>      connection is lost, will the destination receive part of the data
> or 
>      none?  
>      
>      We have people who believe the entire FTP is buffered and if the 
>      connection is lost, then nothing is sent.  We have people who
> believe 
>      that the data is buffered into smaller subsets (say, packets,
> perhaps) 
>      and sent as each subset is filled, so that if the connection is
> lost, 
>      the destination will recieve whatever subsets have been
> transmitted 
>      until the time the connection was lost.  And we have people who 
>      believe the data is 'streamed' and if the connection is lost, the
> 
>      destination receives whatever has been sent to the point so that
> even 
>      a single record can arrive incomplete.
>      
>      Thanks for any help.
>      jw
>      
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