How to define retry policy for Azure Function Timer trigger - NodeJs v4

Question

I'm new to Azure and looking to define retry policies for my function app timer trigger in Nodejs v4. I could not find documentation defining the configuration in V4 model, though it is possible to define in V3 model in function.json file that V4 does not support. https://techcommunity.microsoft.com/t5/apps-on-azure-blog/azure-functions-node-js-v4-programming-model-is-generally/ba-p/3929217

Answer 1

Hello @Gagandeep Singh - Thanks for confirming in the comments. The retry policy for Time Triggers is a GA feature, and it can be configured in the v4 programming model of NodeJS. Based on the TimerFunctionOptions type, which is found here, you can pass in RetryOptions object (describing the retry policy) to retry as follows:

const { app } = require('@azure/functions');

app.timer('timerTrigger', {
    schedule: '0 */5 * * * *',
    handler: (myTimer, context) => {
        context.log('Timer function processed request.');
    },
    retry: {
        strategy: 'fixedDelay',
        maxRetryCount: 3,
        delayInterval: 300
    }
});

Config object for exponentialBackoffpolicy can be found here: https://github.com/Azure/azure-functions-nodejs-library/blob/aa9068df56c2d4c2b90ee55dd42005e1d7c5cb4c/types/index.d.ts#L142

UPDATE 2/7/24: If the function execution does not complete the schedule will not be updated so the timer will be seen as past due. The following note in the TimerTrigger doc is still valid in this case:

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