Data may be duplicated or lost when you receive data in BizTalk Server 2004 by using the FTP adapter (886989)
The information in this article applies to:
- Microsoft BizTalk Server 2004 Developer Edition
- Microsoft BizTalk Server 2004 Enterprise Edition
- Microsoft BizTalk Server 2004 Partner Edition
- Microsoft BizTalk Server 2004 Standard Edition
SYMPTOMSUnder certain circumstances, data that is received in Microsoft BizTalk
Server 2004 by using the FTP adapter may be duplicated or lost. CAUSEThe BizTalk Server 2004 FTP adapter uses the FTP client
protocol to poll the designated FTP server and retrieves data from the server
"as is." The FTP adapter does not validate any data that it
retrieves. The FTP adapter sends the retrieved document to the BizTalk Messaging
Engine for processing and then it deletes the original document from the FTP
server. If the FTP adapter retrieves a document from the FTP server that is
still being written to by the host application, the retrieved document will
be incomplete. If the FTP adapter retrieves an incomplete copy of the original document, data duplication or data loss may occur in the following scenarios:
- If the original document is still being written to the FTP
server by the host application, the FTP adapter cannot delete
the document and will retrieve another copy of the document at the next polling
interval that is configured for the receive location. This behavior causes document
duplication to occur.
- If the host application has finished writing the document
to the FTP server, the document will be deleted. This behavior will cause data loss
to occur.
WORKAROUNDTo work around this behavior, use one of the following methods:
- Configure the host application to write to a temporary
folder on the same hard disk as the public FTP folder and to periodically move the
contents of the temporary folder to the FTP folder. The temporary folder should
be on the same hard disk as the public FTP folder to make sure that the move operation
is atomic. An atomic operation is an operation that is functionally indivisible. If you write data to the public FTP folder by using the BizTalk
Server 2004 FTP adapter, you can do this by specifying a Temporary
Folder property in the FTP Transport Properties dialog box when you configure a send
port. If you specify a Temporary Folder property, make sure that this folder is on the same
physical disk as the public FTP folder.
- Configure the FTP receive location to operate within a
service window when the host application is not writing data
to the FTP server. You can specify the service window when
you configure the receive location properties.
STATUS
This behavior is by design.
| Modification Type: | Major | Last Reviewed: | 3/18/2005 |
|---|
| Keywords: | kbprb KB886989 kbAudDeveloper |
|---|
|