Retry Policy With A DLQ

[Jianping Roth]

I have a question regarding the cloud subscription retry policy maximum delivery attempts. It didn't work for me.

 

I created a cloud topic, a dead letter topic and push subscription using a CloudRun. 

The subscription is associated the DLQ and the maximum delivery attempts is 5. I also created a default subscription on the DLQ.

I then published a message containing invalid data to test the maximum delivery attempts. The invalid data caused an exception in the CloudRun. The message was then retried forever (or until the end of the message retention) even though the message was also  published to the DLQ.

My question is how I can make my subscription retry a message for more or less the value I defined ?

[plaj]

Hi there,

Even though it is documented that the maximum number of delivery attempts is approximate because Pub/Sub forwards undeliverable messages on a best-effort basis, it doesn't seem to be right that the message is retried indefinetely until the end of message retention. 

For this reason, since the behavior is unexpected I’d advise you to open an issue with issue-tracker [2], where you’ll get updates from the product team regarding this issue.

Best regards.
__________________
[1] https://cloud.google.com/pubsub/docs/dead-letter-topics
[2] https://cloud.google.com/support/docs/issue-trackers

[Kamal Aboul-Hosn]

It sounds like perhaps you did not grant Pub/Sub publish permission on the DLQ topicand subscribe permission on the subscription. Please verify that you set these permissions. They are required for DLQ to work as expected.

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[Jianping Roth]

I want to clarify what happened: it was the incorrect setup: I didn't grant the subscriber permission and so the subscription is unable to remove the request

gcloud pubsub subscriptions add-iam-policy-binding ${topic} \
    --member=serviceAccount:${serviceAccount} \
    --role=roles/pubsub.subscriber

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Jianping Roth
Software Developer
xMatters: Digital Service Availability Platform
jianpi...@xmatters.com | 250-380-0304 ext 427
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