Technoboy- opened a new pull request, #16235:
URL: https://github.com/apache/pulsar/pull/16235
### Motivation
When broker do `monitorBacklogQuota`, there may throw NPE.
```
2022-06-24T18:14:38,360-0400 [pulsar-backlog-quota-checker-29-1] ERROR
org.apache.pulsar.broker.service.BacklogQuotaManager -
[persistent://enmv/epnmccs-yang/ECLIPSE-epnmccs-yang-ms-east-partition-1] Error
resetting cursor for slowest consumer [ENMV_CCS_SUBSCRIPTION]
java.lang.NullPointerException: null
at
org.apache.pulsar.broker.service.BacklogQuotaManager.dropBacklogForTimeLimit(BacklogQuotaManager.java:247)
at
org.apache.pulsar.broker.service.BacklogQuotaManager.handleExceededBacklogQuota(BacklogQuotaManager.java:127)
at
org.apache.pulsar.broker.service.BrokerService.lambda$monitorBacklogQuota$78(BrokerService.java:1721)
at java.util.Optional.ifPresent(Optional.java:183) ~[?:?]
at
org.apache.pulsar.broker.service.BrokerService.lambda$forEachTopic$77(BrokerService.java:1705)
at
org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap$Section.forEach(ConcurrentOpenHashMap.java:544)
at
org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap.forEach(ConcurrentOpenHashMap.java:272)
at
org.apache.pulsar.broker.service.BrokerService.forEachTopic(BrokerService.java:1703)
at
org.apache.pulsar.broker.service.BrokerService.monitorBacklogQuota(BrokerService.java:1714)
```
Below is the related code :
https://github.com/apache/pulsar/blob/a3f52891593e093c27b583094a1fbfd09bbbae1a/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/BacklogQuotaManager.java#L241-L257
The root cause is that the slowest consumer ledgerId may be trimmed, so we
need to check `ledgerInfo`.
### Documentation
- [x] `doc-not-needed`
(Please explain why)
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