Intermittant DriveWriteVolume rateMax exception - google-apps-script

Question

I have been struggling with this error since about a week before DriveApp was released. I have a section of code that fails intermittantly with the error:
Service invoked too many times in a short time: driveWriteVolume rateMax. Try Utilities.sleep(1000) between calls.
Here is the code in question:
for(var a = 0; a<attachments.length; a++){
if(a > 0){
child = "." + (a + 1) + " ";
}
else{
child = ".1 ";
}
var parent = (m + 1);
Utilities.sleep(5000);
var file = attachmentFolder.createFile(attachments[a]);//This is the line that causes the error.
Utilities.sleep(1000);
file.rename(parent + child + attachments[a].getName());
}
I started with 1000ms, then gradually worked up to 5000 and it still throws the error every ~200 iterations. This is using DocsList.

Answer 1

I have had a similar problem in a script I'm working on.
The problem arises when I loop through the attachments to the message and attempt to save them too. If I skip the attachments, I don't have a problem, even with the same number of total file creations and the same sleep time between them. This is the code I'm using. newFolder.createFile(pdfBlob) does not cause a problem. newFolder.createFile(attachmentBlob) does.
// Create the message PDF inside the new folder
var htmlBodyFile = newFolder.createFile('body.html', messageBody, "text/html");
var pdfBlob = htmlBodyFile.getAs('application/pdf');
pdfBlob.setName(newFolderName + ".pdf");
newFolder.createFile(pdfBlob);
Utilities.sleep(sleepTime); // wait after creating something on the drive.
htmlBodyFile.setTrashed(true);
// Save attachments
Logger.log("Saving Attachments");
for(var i = 0; i < messageAttachments.length; i++) {
Logger.log("Saving Attachment " + i);
var attachmentBlob = messageAttachments[i].copyBlob();
newFolder.createFile(attachmentBlob);
Utilities.sleep(sleepTime); // wait after creating something on the drive.
} // each attachment