ERR XReadGroup is cancelled - Upstash Documentation

Symptom

The client gets an exception similar to:

ReplyError: ERR XReadGroup is cancelled. Pending Entries List limit per consumer is about to be reached. Limit: 1000, Current PEL size: 90, Requested Read: 20, Key: mstream, Group: group1, Consumer: consumer1.

Diagnosis

Pending Entries List of the stream for the consumer is full. For each consumer in a consumer group, there is a pending entries list. This list keeps the messages that are delivered to a consumer but not yet acknowledged via XACK. This list is populated via XREADGROUP.

Solution

Acknowledge the consumed messages via XACK from the list of the associated group and consumer.

Related topics

XREADGROUP Error read ECONNRESET ERR DB capacity quota exceeded Create URL Groups and Endpoints

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