hangc0276 opened a new pull request #7794:
URL: https://github.com/apache/pulsar/pull/7794
### Motivation
The zk cache executor thread pool size is hard code to 10 when pulsar
service start, it should be configurable in broker.conf.
```
private final ScheduledExecutorService cacheExecutor =
Executors.newScheduledThreadPool(10,
new DefaultThreadFactory("zk-cache-callback"));
```
#### Changes
make the zk cache executor threads pool size configurable in broker.conf
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