[GitHub] [pulsar] hellozepp opened a new issue #4535: NPE in UnAckedMessageTrackerDisabled#size()

[GitBox <gi...@apache.org>]

hellozepp opened a new issue #4535: NPE in UnAckedMessageTrackerDisabled#size()
URL: https://github.com/apache/pulsar/issues/4535
 
 
   **Describe the bug**
   NPE in UnAckedMessageTrackerDisabled#size()
   
   If `ackTimeout` is not set, `unAckedMessageTracker` will be assigned the value `UNACKED_MESSAGE_TRACKER_DISABLED`.
   
   Look `UnAckedMessageTrackerDisabled` not Override the `size()` method.
   
   **To Reproduce**
   Steps to reproduce the behavior:
   1. Create a consumer and do not set `ackTimeout`
   2. Call the size() use the following code.
   `((ConsumerImpl<byte[]>) consumer).getUnAckedMessageTracker().size()`
   
   **Expected behavior**
   This is a disabled method. We can get a default value. Such as 0. 
   
   **Desktop (please complete the following information):**
    - OS: MacOS
   
   

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