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https://issues.apache.org/jira/browse/MYFACES-3586?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Rohit Dilip Kelapure updated MYFACES-3586:
------------------------------------------
Status: Patch Available (was: Open)
> Performance improvement in Resource loading - HIGH CPU inflating bytes in
> ResourceHandlerImpl.handleResourceRequest
> -------------------------------------------------------------------------------------------------------------------
>
> Key: MYFACES-3586
> URL: https://issues.apache.org/jira/browse/MYFACES-3586
> Project: MyFaces Core
> Issue Type: Improvement
> Environment: ALL
> Reporter: Rohit Dilip Kelapure
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> In a high concurrency load test with Apache MyFaces + RichFaces component
> library we found that under peak load majority of our web container threads
> were stuck in this call stack
> at java/util/zip/Inflater.inflateBytes(Native Method)
> at java/util/zip/Inflater.inflate(Inflater.java:249(Compiled Code))
> at
> java/util/zip/InflaterInputStream.read(InflaterInputStream.java:146(Compiled
> Code))
> at
> java/util/zip/InflaterInputStream.read(InflaterInputStream.java:116(Compiled
> Code))
> at java/io/FilterInputStream.read(FilterInputStream.java:77(Compiled Code))
> at java/io/FilterInputStream.read(FilterInputStream.java:77(Compiled Code))
> at java/io/PushbackInputStream.read(PushbackInputStream.java:133(Compiled
> Code))
> at
> org/apache/myfaces/shared_impl/resource/ResourceImpl$ValueExpressionFilterInputStream.read(ResourceImpl.java:117(Compiled
> Code))
> at java/io/InputStream.read(InputStream.java:175(Compiled Code))
> at java/io/InputStream.read(InputStream.java:97(Compiled Code))
> at
> org/apache/myfaces/application/ResourceHandlerImpl.pipeBytes(ResourceHandlerImpl.java:402(Compiled
> Code))
> at
> org/apache/myfaces/application/ResourceHandlerImpl.handleResourceRequest(ResourceHandlerImpl.java:357(Compiled
> Code))
> at
> org/richfaces/resource/ResourceHandlerImpl.handleResourceRequest(ResourceHandlerImpl.java:257(Compiled
> Code))
> at javax/faces/webapp/FacesServlet.service(FacesServlet.java:183(Compiled
> Code))
> at
> org/richfaces/webapp/ResourceServlet.httpService(ResourceServlet.java:110(Compiled
> Code))
> at
> org/richfaces/webapp/ResourceServlet.service(ResourceServlet.java:105(Compiled
> Code))
> After looking at the src code of
> org.apache.myfaces.application.ResourceHandlerImpl.handleResourceRequest(FacesContext)
> I can see that the ResourceHandlerCache caches the Resource metadata ;
> however the actual output of the resource which is written to the
> outputstream in ResourceHandlerImpl.pipeBytes is NEVER cached.
> This causes a scalability problem in our case because each access to the
> resource involves cracking open a jar, inflating the bytes and parsing a
> stream of bytes. This is done multiple times for the same resource(say a css
> file) inside the richfaces jar inspite of the resource not changing.
> I propose a much needed performance optimization wherein we cache the output
> of the Resource handled and stash the output byte[] it as softReference in
> the ResourceHandlerCache.ResourceValue.
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