swjz opened a new issue #14372:
URL: https://github.com/apache/pulsar/issues/14372
**Describe the bug**
On `pulsar-client==2.9.1` (python), `acknowledge_cumulative()` does not work
with a consumer subscribed to multiple topics.
**To Reproduce**
Set up a pulsar server on `localhost:6650`. Create two topics `topic1` and
`topic2`. Make sure each topic has at least one message in it so we can consume
them later.
Run the following code to consume a message.
```python
import pulsar
from _pulsar import InitialPosition
client = pulsar.Client(service_url='pulsar://localhost:6650')
consumer = client.subscribe(['topic1', 'topic2'], subscription_name='test',
initial_position=InitialPosition.Earliest)
msg = consumer.receive()
consumer.acknowledge_cumulative(msg)
```
The last line `acknowledge_cumulative()` throws `RuntimeError:
bad_function_call`.
**Expected behavior**
No error should be raised.
**Screenshots**
If applicable, add screenshots to help explain your problem.
**Desktop (please complete the following information):**
- OS: Ubuntu 20.04.3 LTS
- Python 3.8.10
- `pulsar-client==2.9.1`
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