File adapter Need to wait When Other Applicatio is writing the file

Question

Hi All,
This is File to File Interface, iam using NFS here.
While other application is writing the file to the Folder, XI Sender File Adapter shld wait for certain time and then pick it up.
We have the Option " MSecs to Wait Before Modification Check" on File Sender Advanced TAB.
But it is no Use, it is not behaving correctly.
Please assist me on this
Regards

Answer 1

Hey Vamsi,
I think you're good to go here. The behaviour is exactly as it should be. The polling interval takes priority when there is no file there but when there is a file there the modification check will take priority over polling interval so it will still wait the mandatory 2 minutes to ensure that no modification is taking place & that's exactly what you want. You don't want to pick up an incomplete file irrespective of when it was put there. So there will always be just over a 2 minute delay (or whatever you set the Msecs value to + a few seconds depending on where the polling cycle is when a file is written out but a max of 2 minutes & 19 seconds delay) when there is a file there but at least you'll have consistent data. If there is no file there the adapter will just poll every 20 seconds until a file arrives.
The 2 minute 'wait' step is exactly that. The adapter will see the file then wait 2 minutes & probably does a timestamp comparison or something. It doesn't do a modification check within those 2 minutes. Having said that, I don't see why you can't reduce the Msecs interval. My reasoning is that you basically want to establish whether it's still being wriiten out before you pick it up. Even if you set it to 5 seconds you should still be able to pickup whether the file is being modified (I'm assuming that the check is doing a timestamp comparison). That will significantly reduce your time wait period.
My assumption on the timestamp comparison was wrong It's actually does a comparison on file size when it reads the data in, see SAP Note (Point 3): [http://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/oss_notes/sdn_oss_bc_xi/~form/handler%7b5f4150503d3030323030363832353030303030303031393732265f4556454e543d444953504c4159265f4e4e554d3d383231323637%7d]
Another suggestion made on the note: Get the writing application to write the file out with an extension different to the one you're polling for. Then, after they have completed writing out the file, they can do a re-name to the extension that you're polling for. That could also speed up things.
Regards, Trevor
Edited by: Trevor Naidoo on Oct 8, 2009 9:38 AM