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From "AnilKumar Attuluri (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FELIX-5665) High CPU usage on org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation
Date Fri, 21 Jul 2017 18:44:00 GMT

    [ https://issues.apache.org/jira/browse/FELIX-5665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16096686#comment-16096686

AnilKumar Attuluri commented on FELIX-5665:

Ok here are some findings:
i) Having *sun.reflect.** isn't working for boot delegation of *sun.reflect.GeneratedMethodAccessor<random_number>*
but having a specific*sun.reflect.DelegatingMethodAccessorImpl* in the config worked for that
specific class.

ii) And for *sun.reflect.DelegatingMethodAccessorImpl* when its boot delegated its using *URLHandler*
as the classloader

> High CPU usage on org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation
> ---------------------------------------------------------------------------------------------
>                 Key: FELIX-5665
>                 URL: https://issues.apache.org/jira/browse/FELIX-5665
>             Project: Felix
>          Issue Type: Bug
>    Affects Versions: framework-5.6.4
>            Reporter: AnilKumar Attuluri
>         Attachments: IMG_1.jpg, IMG_2.jpg
> We have been running some performance tests to prepare our OSGi bundle (*running in Apache
Karaf*) for production.
> Just to give some background about our OSGi bundle, we converted an existing Spring application
into an OSGi bundle with all the current dependencies packaged into the bundle as an uber
> When we run >= 500 TPS (each of these calls results in a http call made via a library)
we run into this high CPU usage spikes reaching up to 100% CPU. Please see the image attached,
the spikes in the image are 100% CPU usage while the average is about 40%. Also see the CPU
sampler image which points to *org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation*
> Is there an existing bug/documentation that already captures this?
> We don't see this behavior when we run the same app in standalone JVM.

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