Grouping

KubeMQ supports grouping receivers with the same subscription channel patterns to form a load balancing group.

The group pattern is a useful pattern for sharing message load handling between services and for redundancy functionality too.
During a Subscription request, the receiver can set the group name to join or not. Based on the Group value setting KubeMQ will deliver messages to the receiver as follows:
  • Any receiver without a group setting (group="", blank)
  • Only one receiver for each group he belongs to
Example:
In the table below we have 8 receivers which subscribe to different channels and groups:
Receiver Name
Channel
Group
R1
foo.>
""
R2
foo.>
g1
R3
foo.>
g1
R4
foo.*
g2
R5
foo.*
g2
R6
>
w1
R7
*
""
R8
foo.bar
""
In the table below, we explore several message channels and which receiver will get them:
Sending Message to Channel
Receivers
foo
R6,R7
foo.bar
R1, R2 or R3, R4 or R5, R6, R8
foo.bar.zoo
R1, R2 or R3, R6, R8
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Consumer Groups