rollback?

[cinterloper]

is there an opposite of task_done() where a commit can be aborted?

alternatively, is there a peek() function that will get the next value but not remove it from the queue?
my use case is moving a piece of data to another system, where i only want to remove it from the queue if its successfully persisted to the next stage of processing.

[peter-wangxu]

Please consider the SQLiteAckQueue

[cinterloper]

Thanks for pointing that out