Duplicate notifications being sent out at high rate

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Instantiate a PushQueue using Push.queue(...).
2. Push notifications with payload that exceeds max payload size (that is, 
throws PayloadMaxSizeExceededException). In our case max payload size if 256 
bytes.

What is the expected output? What do you see instead?
That each device receives a single notification. Instead we are seeing 
notifications being delivered to device many times. Like an infinite loop or 
something.

What version of the product are you using? On what operating system?
Build of revision 353.

Please provide any additional information below.

We have verified that:
 * We've been using this library for two years now without any issues. Suddenly this morning, we started seeing this issue.
 * The users seeing duplicate notifications don't have duplicate device tokens.
 * That shutting down our backend stopped the sendouts.

Any input would be appreciated. Have you heard of anyone else experiencing this?

Original issue reported on code.google.com by [email protected] on 9 Mar 2015 at 11:16