XGROUP CREATECONSUMER key group consumer
Time complexity: O(1)
ACL categories: @write, @stream, @slow
Create a consumer in a group. <key> denotes the stream and <group> is the group name in which the <consumer> is being created. Both the stream and group must already exist in order to make the operation successful.
Consumers in a group are entities that consume data. Consumers, unless claimed explicitly, do not share received entries. Each consumer has their own pending entry list (PEL) where they store the received entries. Consumers can either read entries from their own PEL or from the group (entries that are not yet read by other consumers).
Integer reply: the number of created consumers (0 or 1)