Technoboy- opened a new pull request, #15342:
URL: https://github.com/apache/pulsar/pull/15342
### Motivation
Sometimes the messages sent to consumers are delayed over 100ms and we find
that the CPU is wasted on :
```
"BookKeeperClientWorker-OrderedExecutor-4-0" #64 prio=5 os_prio=0
cpu=2447920216.81ms elapsed=3636758.63s tid=0x00007f48bdc07290 nid=0xae
runnable [0x00007f47ee2e2000]
java.lang.Thread.State: RUNNABLE
at
org.apache.bookkeeper.util.collections.ConcurrentLongLongPairHashMap.forEach(ConcurrentLongLongPairHashMap.java:197)
at
org.apache.pulsar.broker.service.persistent.MessageRedeliveryController.containsStickyKeyHashes(MessageRedeliveryController.java:97)
at
org.apache.pulsar.broker.service.persistent.PersistentStickyKeyDispatcherMultipleConsumers.getRestrictedMaxEntriesForConsumer(PersistentStickyKeyDispatcherMultipleConsumers.java:335)
at
org.apache.pulsar.broker.service.persistent.PersistentStickyKeyDispatcherMultipleConsumers.sendMessagesToConsumers(PersistentStickyKeyDispatcherMultipleConsumers.java:232)
at
org.apache.pulsar.broker.service.persistent.PersistentDispatcherMultipleConsumers.readEntriesComplete(PersistentDispatcherMultipleConsumers.java:480)
- locked <0x0000100117401718> (a
org.apache.pulsar.broker.service.persistent.PersistentStickyKeyDispatcherMultipleConsumers)
at
org.apache.bookkeeper.mledger.impl.OpReadEntry.lambda$checkReadCompletion$2(OpReadEntry.java:156)
```
Then we find there are many empty datas in the map from dump :
<img width="1056" alt="image"
src="https://user-images.githubusercontent.com/6297296/165461606-9e803243-174b-4fc5-835a-5e9da9bca48a.png";>
As #14515 has introduced shrink map, it's better to use it to avoid iterator
the empty data.
### Documentation
- [x] `no-need-doc`
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