Question Re: Max Redelivery Count and Dead Message Queue in Technology Q&A

Max Redelivery Count and Dead Message Queue

mig1 — Sat, 19 Dec 2020 19:53:35 GMT

When using the UI for Enterprise Messaging, requests are made to the queues endpoint where each queue have the properties maxRedeliveryCount and deadMsgQueue. How can these be configured?

I need them for my webhook subscriptions to not block the queue whenever there are messages that can't be handled. My webhooks are configured with QoS = 1.

GET https://<host>.enterprise-messaging.cfapps.eu10.hana.ondemand.com/clients/queues  

{
    "name": "em/sap/ecc/queue-equipments",
    "messageCount": 1873,
    "queueSizeInBytes": 623139,
    "unacknowledgedMessageCount": 4,
    "maxQueueSizeInBytes": 1572864000,
    "accessType": "EXCLUSIVE",
    "maxDeliveredUnackedMsgsPerFlow": 10000,
    "maxMessageSizeInBytes": 10000000,
    "respectTtl": false,
    "maxRedeliveryCount": 0,
    "maxTtl": 0,
    "deadMsgQueue": null
  }

Re: Max Redelivery Count and Dead Message Queue

mig1 — Sat, 19 Dec 2020 19:54:37 GMT

The properties are not part of the documentation at https://help.sap.com/doc/75c9efd00fc14183abc4c613490c53f4/Cloud/en-US/rest-management-messaging.html#_queue

Re: Max Redelivery Count and Dead Message Queue

tejesvi_dvr — Mon, 21 Dec 2020 08:52:24 GMT

hi Mikael,

you an use maxRedeliveryCount and deadMsgQueue set these properties while creating/updating a queue.

{"maxRedeliveryCount": 1,"deadMsgQueue": "DMQ"}

by default the value will be zero for maxRedeliveryCount and deadMsgQueue will be null.

Note: By default, each Queue is assigned a Default deadMsgQueue which does not exists. User must create a deadMsgQueue and assign it to the Actual Queue. when TTL expires for a message or the Number of redelivery attempts for a message exceeds the Max Redelivery value the messages instead of getting discarded can be moved to DMQ.

we are yet to update the documentation for these properties.

Regards,

Tejesvi

Re: Max Redelivery Count and Dead Message Queue

mig1 — Mon, 21 Dec 2020 09:39:49 GMT

Thanks! These are the ones I tried to set as well but the behaviour was not fully as expected for a queue with a webhook subscription.

Looking forward to the documentation!