aloyszhang opened a new pull request #13085:
URL: https://github.com/apache/pulsar/pull/13085
### Motivation
If we have a topic with write quorum > ack quorum, when there are some
entries that met the ack quorum but not the write quorum, then these entries
will trigger an ensemble change when complete.
```shell
14:32:50.001 [BookKeeperClientWorker-OrderedExecutor-34-0] INFO
org.apache.bookkeeper.client.LedgerHandle - New Ensemble: [11.181.55.191:3181,
9.146.211.202:3181, 11.181.55.252:3181] for ledger: 482146
14:32:50.004 [BookKeeperClientWorker-OrderedExecutor-34-0] INFO
org.apache.bookkeeper.client.LedgerHandle - New Ensemble: [11.181.55.191:3181,
9.146.211.234:3181, 11.181.55.252:3181] for ledger: 482146
14:32:50.008 [BookKeeperClientWorker-OrderedExecutor-34-0] INFO
org.apache.bookkeeper.client.LedgerHandle - New Ensemble: [11.181.55.191:3181,
11.181.55.210:3181, 11.181.55.252:3181] for ledger: 482146
```
The ensemble change happened many times, so, it's better we can add a limit
for this behavior.
### Modifications
Add `bookkeeperMaxNumEnsembleChanges` in broker.conf to limit the max number
of ensemble changes.
### Verifying this change
- [ ] Make sure that the change passes the CI checks.
### Documentation
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