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Consumer Rebalance Simulator
Understand how Kafka assigns partitions to consumers using different assignors
Configuration
Adjust topic and consumer group settings to trigger rebalances
Note: Partitions can only be increased, not reduced in Kafka
Cooperative Sticky Assignor
Instead of 'stop everything → revoke all → reassign', it does 'revoke only what is needed → gradual reassignment'.
Zero-downtimeKIP-429Use in production
Rebalance Status
Partitions
6
Consumers
2
Rebalance Count
0
Consumer-Partition Assignment
Shows which partitions are assigned to each consumer. A partition can only be assigned to ONE consumer at a time.
Rebalance Event Log
No rebalance events yet. Try adding/removing consumers or partitions.
Assignor Comparison
Range Assignor
- All partitions across topics are flattened
- Then assigned one-by-one in circular fashion
Round Robin Assignor
- All partitions across topics are flattened
- Then assigned one-by-one in circular fashion
Sticky Assignor
- First: balances partitions evenly
- Then: retains previous assignments
Cooperative Sticky Assignor
- Revoke only what is needed → gradual reassignment
- Instead of stop everything → revoke all → reassign