BewareMyPower edited a comment on issue #7728:
URL: https://github.com/apache/pulsar/issues/7728#issuecomment-689286006
@codelipenghui @sijie I reproduced the issue accidentally. If the broker's
`allowAutoTopicCreationType` is `partitioned`, then the automatically created
topic has no schema.
It's easy to reproduce:
1. Run a consumer to subscribe a topic that doesn't exist now, e.g.
```java
try (Consumer<byte[]> consumer = client.newConsumer() //
.topic("PulsarBar") // PulsarBar doesn't exist
.subscriptionName("my-sub") //
.subscribe()) {
```
2. Check the topic's schema
```bash
$ ./bin/pulsar-admin schemas get "persistent://public/default/PulsarBar"
HTTP 404 Not Found
Reason: HTTP 404 Not Found
$ ./bin/pulsar-admin schemas get
"persistent://public/default/PulsarBar-partition-0"
HTTP 404 Not Found
Reason: HTTP 404 Not Found
```
The broker logs:
```
11:36:15.409 [ForkJoinPool.commonPool-worker-25] INFO
org.eclipse.jetty.server.RequestLog - 10.208.65.74 - - [09/Sep/2020:11:36:15
+0800] "GET
/admin/v2/schemas/public/default/PulsarBar/schema?authoritative=true HTTP/1.1"
404 0 "-" "Pulsar-Java-v2.6.0" 4
```
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