Documentation Index
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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.
