[jira] [Updated] (KARAF-5395) Improve memory consumption during resolution

["Guillaume Nodet (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KARAF-5395?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Guillaume Nodet updated KARAF-5395:
-----------------------------------
    Summary: Improve memory consumption during resolution  (was: ResourceImpl/RequirementImpl/CapabilityImpl do not correctly implement their OSGi interface contracts)

> Improve memory consumption during resolution
> --------------------------------------------
>
>                 Key: KARAF-5395
>                 URL: https://issues.apache.org/jira/browse/KARAF-5395
>             Project: Karaf
>          Issue Type: Bug
>          Components: karaf-feature
>    Affects Versions: 4.2.0, 4.1.2, 4.0.10
>            Reporter: Robert Varga
>            Assignee: Guillaume Nodet
>            Priority: Critical
>             Fix For: 4.2.0
>
>
> This is a follow-up of downstream issue tracked at https://bugs.opendaylight.org/show_bug.cgi?id=9218.
> OpenDaylight uses auto-generated features, which may end up packaging a bundle multiple times in separate features -- which can be regarded as a bug, but it certainly is counter-intuitive.
> Using a simple test case of wanting to install all features at the same time triggers huge memory usage spike in Felix Resolver.
> Since ResourceImpl does not explictly override hashCode()/equals() according to org.osgi.resource.Resource interface contract, every resource declaration in a feature is treated as unique -- disregarding the fact that multiple bundle declarations are actually pointing to the same bundle.
> This cascades to both RequirementImpl and CapabilityImpl, hence each such duplicate bundle is added to the set of Requirements to be resolved and its capabilities are added to potential candidates -- leading to Felix Resolver having a large problem space (what to resolve) and also having a large solution space (how to resolve) -- leading to polynomial explosion in CPU and memory requirements.
> The amount of memory consumed by OpenDaylight Nitrogen RC3 has been observed at 1.2GB, e.g. with a heap smaller than that, the container runs into OOM during feature:install before actual installation starts.



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