Hi community
I want to change the behavior of DLQ/Retry Topic auto creation.
### Motivation
After you set `defaultNumPartitions` to `16`, you will get `16` partitions
per topic, and `16*16` DLQ partitions per subscription, you will get a huge
number of DLQs if you have more than one subscription under one topic. For
example:
- create topic `t1` with `16` partitions
- you will get `t1-partition-0`, `t1-partition-1`...`tp-partition-15`.
- after you enable DLQ, you will get the following `16*16` DLQs per
subscription
- `t1-partition-0-{subscription}-DLQ-partition-0`
- `t1-partition-0-{subscription}-DLQ-partition-1`
- ...
- `t1-partition-15-{subscription}-DLQ-partition-15`
- `t1-partition-1-{subscription}-DLQ-partition-0`
- `t1-partition-1-{subscription}-DLQ-partition-1`
- ...
- ...
- ...
- `t1-partition-15-{subscription}-partition-15`
### Goal
- Do not create partitioned DLQs/Retry topics automatically.
- Users can also create partitioned DLQ manually if they need it.
I have drafted a PR, please take a look
- https://github.com/apache/pulsar/pull/22705
Thanks
Yubiao Feng
