[GitHub] [pulsar] Jason918 edited a comment on issue #12723: Race condition in PersistentTopic#addReplicationCluster

[GitBox <gi...@apache.org>]

Jason918 edited a comment on issue #12723:
URL: https://github.com/apache/pulsar/issues/12723#issuecomment-965011704


   I found another interesting thing is that in org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap, if we call `map.put(key, null)`, it throws an NullPointerException. But we can use `map.computeIfAbsent(key, k->null)` to insert a null value into the map, which leads to a confusing situation that `map.containsKey(key)` is falsse, but there is actually a "key" in the map with null value.
   
   Not the same behavior in java.util.concurrent.ConcurrentHashMap, a key with null value will be dismissed.


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