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Push tasks being processed via a task queue can fail for many reasons. If a handler
fails to execute a task (and therefore returns any HTTP status code outside of
the range 200–299), App Engine retries the task until it succeeds.
By default, the system gradually reduces the retry rate to avoid overloading your application with too many
requests, but schedules retry attempts to recur at a maximum of once per hour
until the task succeeds.
Retrying tasks
You can customize your own scheme for task retries by
adding the retry
parameters
element in queue.yaml. This
addition allows you to specify the maximum number of times to retry failed tasks
in a specific queue. You can also set a time limit for retry attempts and
control the interval between attempts.
The following example demonstrates various retry scenarios:
In fooqueue, tasks are retried up to seven times and for up to two days
from the first execution attempt. After both limits are passed, it fails
permanently.
In barqueue, App Engine attempts to retry tasks, increasing the interval
linearly between each retry until reaching the maximum backoff and retrying
indefinitely at the maximum interval (so the intervals between requests are
10s, 20s, 30s, ..., 190s, 200s, 200s, ...).
In bazqueue, the retry interval starts at 10s, then doubles three times,
then increases linearly, and finally retries indefinitely at the
maximum interval (so the intervals between requests are
10s, 20s, 40s, 80s, 160s, 240s, 300s, 300s, ...).
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07 UTC."],[[["App Engine automatically retries tasks that fail, meaning any HTTP status code outside of 200-299, with a gradually decreasing retry rate, up to a maximum of once per hour."],["Retry settings can be configured for individual queues or specified within the `Task` type, with the latter taking precedence when both are defined."],["Custom retry schemes can be set up in `queue.yaml`, allowing control over the maximum number of retries and the time limit for retry attempts, as well as the interval between them."],["Different retry behaviors, such as a fixed number of retries, linearly increasing retry intervals, or exponentially increasing intervals followed by a linear increase and then indefinite retries, can be defined."]]],[]]