[jbossws-dev] [Design of JBoss Web Services] - Re: Why is the UMDM using ConcurrentHashMap?

[heiko.braun@jboss.com]

AFAIK plain HashMap is holding a _map wide_ lock for any retrieval operation or iterator traversal. ConcurrentHashMap doesn't do it (well, at least more fine grained). 

I am not looking at write operations. Performance tests showed that concurrent requests to the same service (shared meta data) suffered from synchronisation issues. That's why i replaced the plain HashMap.


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