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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.
This API is supported for first-generation runtimes and can be used when upgrading to corresponding second-generation runtimes. If you are updating to the App Engine runtime, refer to the Upgrade to second-generation runtimes page to learn about your migration options for legacy bundled services.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 tasksYou can customize your own scheme for task retries by adding the retry parameters element in queue.yaml
The following example demonstrates various retry scenarios:
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.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, ...).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, ...). <?xml version="1.0" encoding="utf-8"?>
<queue-entries>
<queue>
<name>fooqueue</name>
<rate>1/s</rate>
<retry-parameters>
<task-retry-limit>7</task-retry-limit>
<task-age-limit>2d</task-age-limit>
</retry-parameters>
</queue>
<queue>
<name>barqueue</name>
<rate>1/s</rate>
<retry-parameters>
<min-backoff-seconds>10</min-backoff-seconds>
<max-backoff-seconds>200</max-backoff-seconds>
<max-doublings>0</max-doublings>
</retry-parameters>
</queue>
<queue>
<name>bazqueue</name>
<rate>1/s</rate>
<retry-parameters>
<min-backoff-seconds>10</min-backoff-seconds>
<max-backoff-seconds>300</max-backoff-seconds>
<max-doublings>3</max-doublings>
</retry-parameters>
</queue>
</queue-entries>
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-08-07 UTC.
[[["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."],[[["Tasks in a queue that fail are automatically retried by App Engine until they succeed, unless the return is between 200-299."],["Retry attempts are reduced gradually to avoid overloading the application, and then recur at a maximum of once per hour."],["The `queue.yaml` file can be used to customize the retry scheme, including the maximum number of retries, time limits, and intervals between attempts."],["The example demonstrates how to configure retry parameters, including setting limits and specifying different retry intervals with varying linear increases or doublings, allowing for fine-tuned task retry behavior."]]],[]]
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