Changes the visibility timeout of a specified message in a queue to a new
value. The maximum allowed timeout value you can set the value to is 12
hours. This means you can't extend the timeout of a message in an
existing queue to more than a total visibility timeout of 12 hours. (For
more information visibility timeout, see Visibility Timeout in the Amazon SQS Developer Guide.)
For example, let's say you have a message and its default message
visibility timeout is 5 minutes. After 3 minutes, you call
ChangeMessageVisiblity
with a timeout of 10 minutes. At that
time, the timeout for the message would be extended by 10 minutes beyond
the time of the ChangeMessageVisibility call. This results in a total
visibility timeout of 13 minutes. You can continue to call
ChangeMessageVisibility to extend the visibility timeout to a maximum of
12 hours. If you try to extend beyond 12 hours, the request will be
rejected.
There is a 120,000 limit for the number of inflight messages per queue.
Messages are inflight after they have been received from the queue by a
consuming component, but have not yet been deleted from the queue. If you
reach the 120,000 limit, you will receive an OverLimit error message from
Amazon SQS. To help avoid reaching the limit, you should delete the
messages from the queue after they have been processed. You can also
increase the number of queues you use to process the messages.
If you attempt to set the VisibilityTimeout
to an amount
more than the maximum time left, Amazon SQS returns an error. It will not
automatically recalculate and increase the timeout to the maximum time
remaining.
Unlike with a queue, when you change the visibility timeout for a
specific message, that timeout value is applied immediately but is not
saved in memory for that message. If you don't delete a message after it
is received, the visibility timeout for the message the next time it is
received reverts to the original timeout value, not the value you set
with the ChangeMessageVisibility
action.