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https://issues.apache.org/jira/browse/CXF-6823?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colm O hEigeartaigh closed CXF-6823.
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> Duplicate injectedProviders in ProviderFactory impacting throughput by ~30%
> ---------------------------------------------------------------------------
>
>                 Key: CXF-6823
>                 URL: https://issues.apache.org/jira/browse/CXF-6823
>             Project: CXF
>          Issue Type: Bug
>          Components: JAX-RS
>    Affects Versions: 3.1.5
>            Reporter: Brendon
>            Assignee: Sergey Beryozkin
>              Labels: performance
>             Fix For: 3.1.6, 3.0.9, 3.2.0
>
>
> We are using CXF to process JAX-RS requests and have noticed a large number 
> of threads blocking in a synchronised block.
> ClientProviderFactory and ServerProviderFactory extend ProviderFactory which 
> contains a member variable 
> org.apache.cxf.jaxrs.provider.ProviderFactory#injectedProviders (a 
> LinkedList).
> Due to injectProviders being a list, it supports (and contains) duplicates.
> In our application, we currently have the following elements in 
> injectProviders:
> org.apache.cxf.jaxrs.client.ClientProviderFactory: 26 elements
> org.apache.cxf.jaxrs.provider.ServerProviderFactory: 8504 elements
> But there are only 4 unique ProviderInfo objects in these lists, namely:
> org.apache.cxf.jaxrs.provider.FormEncodingProvider
> org.apache.cxf.jaxrs.provider.MultipartProvider
> org.apache.cxf.jaxrs.provider.SourceProvider
> org.apache.cxf.jaxrs.provider.JAXBElementProvider
> The issue is that injectProviders is iterated on each response to clear 
> thread local proxies 
> (org.apache.cxf.jaxrs.provider.ProviderFactory#clearThreadLocalProxies).
> Clearing of the thread local proxies relies on a synchronized block to 
> retrieve the thread local proxies from the bus 
> (org.apache.cxf.jaxrs.model.AbstractResourceInfo#getProxyMap).
> This means that at scale, the code blocks waiting for entry into this code. I 
> have seen a huge number of threads waiting for entry into this block.
> As a test, I have changed injectedProviders to a Set to remove the duplicates 
> and have seen an increase in throughput (RPS) of about ~30% in our 
> application.



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