Add a new partition during the consumer group running，but the cousumer group not rebalance。

[leisunstar]

Versions

Please specify real version numbers or git SHAs, not just "Latest" since that changes fairly regularly.
Sarama Version: 1.23.1
Kafka Version: 0.10.1.1
Go Version: go1.12.4

Configuration

config.Net.TLS.Enable = true
config.Net.TLS.Config = tlsConfig
config.Consumer.Return.Errors = true

Logs

N/A

Problem Description

When add new partitions (from 1 to 2), the consumer group, it has no rebalance ,until I start a new consumer or stop a consumer in a same consumer group. How should I get the new partition rebalance message？

[ghost]

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