Deletes the specified message from the specified queue. You specify the
message by using the message's receipt handle
and not the
message ID
you received when you sent the message. Even if
the message is locked by another reader due to the visibility timeout
setting, it is still deleted from the queue. If you leave a message in
the queue for longer than the queue's configured retention period, Amazon
SQS automatically deletes it.
The receipt handle is associated with a specific instance of receiving
the message. If you receive a message more than once, the receipt handle
you get each time you receive the message is different. When you request
DeleteMessage
, if you don't provide the most recently
received receipt handle for the message, the request will still succeed,
but the message might not be deleted.
It is possible you will receive a message even after you have deleted it.
This might happen on rare occasions if one of the servers storing a copy
of the message is unavailable when you request to delete the message. The
copy remains on the server and might be returned to you again on a
subsequent receive request. You should create your system to be
idempotent so that receiving a particular message more than once is not a
problem.