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chpengzh avatar chpengzh commented on July 26, 2024

All method are invoked by PathChildrenCacheListener.childEvent, which will be invoke by a single thread with event order. You can debug it or print a thread id to find that.

RegistryDataCache is not thread safe, yes, but it is used in a thread safe case.

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OrezzerO avatar OrezzerO commented on July 26, 2024

Got it. ZooKeeper watches are single threaded. https://cwiki.apache.org/confluence/display/CURATOR/TN1
So ,it is unnecessary to use ConcurrentHashMap?

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chpengzh avatar chpengzh commented on July 26, 2024

Although it is written by one and read by others, it is better to be thread safe in my opinion. A better practice is using Map.compute or Map.computeIfAbsent rather than multi changes above.

See sofa-dashboard-client for more details.

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