BewareMyPower opened a new issue #8813:
URL: https://github.com/apache/pulsar/issues/8813
**Describe the bug**
When getting the partition metadata for a non-existed topic, it returns 0
instead of throwing an exception.
**To Reproduce**
Steps to reproduce the behavior:
1. Run a pulsar standalone
2. Get a topic's partition number
```java
try (PulsarAdmin admin =
PulsarAdmin.builder().serviceHttpUrl("http://localhost:8080";).build()) {
System.out.println(admin.topics().getPartitionedTopicMetadata("xxxxx").partitions);
} catch (/* ... */) {
```
3. The output is 0 and no exception was thrown.
**Expected behavior**
It should throw an exception because for a non-partitioned topic, its
partitions should be 0, so we cannot distinguish a non-existed topic from a
non-partitioned topic.
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