poorbarcode commented on code in PR #25293:
URL: https://github.com/apache/pulsar/pull/25293#discussion_r2945706148


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pulsar-broker/src/main/java/org/apache/pulsar/utils/SimpleCache.java:
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Review Comment:
   > computeIfAbsent would be used to ensure that duplicates aren't added to 
the map and locking could be handled in ExpirableValue level to avoid shared 
locks and just have a per-key lock.
   
   Since the previous implementation initialised the reader synchronously, the 
method `computeIfAbsent` will be stuck, and following requests will also be 
stuck until the first request is done, right?



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