![]() ![]() But that’s how the administrator configured EFT, so that’s what it’s going to do. If a connected client experiences a simple connection interruption, for example, then the file handle will be closed by EFT, which therefore triggers the Folder Monitor to process what we happen to know a partial file. With a Folder Monitor, EFT reacts when the file handle has been closed. With the File Uploaded event, EFT only reacts when the file has been fully and completely uploaded successfully. This may work out OK some of the time or even most of the time, but not only is the administrator sacrificing the valuable additional knowledge available with the more appropriate File Uploaded event, but they are also gambling that every future upload will always complete successfully. The second scenario is when an EFT administrator tries to use a Folder Monitor to watch where a connected client will be uploading files. But in this kind of scenario EFT will attempt to grab the file after each new chunk is added since the file handle keeps getting closed. This is bad programming and against basic standards. The application may write out a line of a new file, then close the handle, then open a new handle, write out another line, and then close the handle, and so on. ![]() This is definitely rare but certainly not unheard of. The first scenario is when an application-generally a home-grown or very old legacy application or both-misuses file handles. However, there are two basic scenarios to watch out for, scenarios where you must be careful or even avoid using a Folder Monitor altogether. Scenarios in which to Use Caution or Avoid Using Folder Monitor It doesn’t matter if it takes 5 milliseconds or 5 hours, EFT won’t react until the file handle is closed. Essentially, whether some employee is saving a file in an application to that storage source, moving or otherwise copying and pasting it there, or some application server is doing that kind of work, a new file is created and has new contents written to it for some period of time, and then the handle is closed, indicating that process is finished. It allows near real-time reaction to files being added to a directory, either on the local server storage or across the network to any CIFS share. This concept works very well and reliably when dealing with processes and people on the local LAN. ![]() If this is a new concept, and you’d like to see it in action, there are several utilities freely available from Microsoft’s Sysinternals suite, such as Process Monitor that will let you see the continual stream of this otherwise background information. If what it’s doing is writing to a new file, EFT won’t then react until that handle is “closed” or released. A file handle, in this context, means that some application (which could easily be Windows Explorer itself) has taken hold of a file, that it’s doing something with it. ![]() But how do we know the file’s done being written to the directory? And what about the Folder Sweep capability, that option where you can “Scan for files every…” so often? Let’s look at that more closely.ĮFT is able to know that the file is done being added to the directory when the file handle is closed. Something new has shown up in the directory, so there’s something we should do with it.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |