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https://issues.apache.org/jira/browse/KARAF-5395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16192665#comment-16192665
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Guillaume Nodet commented on KARAF-5395:
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To decrease memory consumption further, it could be interesting to investigate
the use of {{org.apache.felix.resolver.util.ArrayMap}} instead of {{HashMap}}
for attributes and directives. For small maps (capacity of 4), it should take
32 bytes instead of 128 afaik.
> ResourceImpl/RequirementImpl/CapabilityImpl do not correctly implement their
> OSGi interface contracts
> -----------------------------------------------------------------------------------------------------
>
> 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
>
> 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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