poorbarcode opened a new pull request, #22705:
URL: https://github.com/apache/pulsar/pull/22705
### 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`
### Modifications
- Do not create partitioned DLQ/Retry topic automatically.
- Users can also create partitioned DLQ manually if they need it.
### Documentation
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- [ ] `doc` <!-- Your PR contains doc changes. -->
- [ ] `doc-required` <!-- Your PR changes impact docs and you will update
later -->
- [x] `doc-not-needed` <!-- Your PR changes do not impact docs -->
- [ ] `doc-complete` <!-- Docs have been already added -->
### Matching PR in forked repository
PR in forked repository: x
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