mattisonchao opened a new pull request, #17483:
URL: https://github.com/apache/pulsar/pull/17483
### Motivation
See error stack trace:
```java
[Unreachable] char[1024] “2022-08-31T08:05:02,202+0000
[BookKeeperClientWorker-OrderedExecutor-0-0] ERROR
org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl - Unknown exception for
ManagedLedgerException.
java.lang.ArrayIndexOutOfBoundsException: -22012
at java.util.ArrayList.elementData(ArrayList.java:424) ~[?:1.8.0_322]
at java.util.ArrayList.get(ArrayList.java:437) ~[?:1.8.0_322]
at
org.apache.pulsar.broker.service.persistent.PersistentStickyKeyDispatcherMultipleConsumers.sendMessagesToConsumers(PersistentStickyKeyDispatcherMultipleConsumers.java:256)
at
org.apache.pulsar.broker.service.persistent.PersistentDispatcherMultipleConsumers.readEntriesComplete(PersistentDispatcherMultipleConsumers.java:517)
at
org.apache.bookkeeper.mledger.impl.ManagedCursorImpl$12.readEntryComplete(ManagedCursorImpl.java:1392)
at org.apache.bookkeeper.mledger.impl.EntryCacheImpl.”
```
Relative code:
https://github.com/apache/pulsar/blob/cfe95ddacc16bd28cf076a7374dff06012f9d21d/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentStickyKeyDispatcherMultipleConsumers.java#L237-L262
When `unackedMessages` is greater than `maxUnackedMessages`, because
`messagesForC` is a negative number, `ArrayIndexOutOfBoundsException` will be
thrown on line 254. Then the exception will cause the message not to be
delivered.
### Modifications
- Add check to avoid negative results
### Verifying this change
- [x] Make sure that the change passes the CI checks.
### Documentation
- [x] `doc-not-needed`
(Please explain why)
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