Hierarchical Classloaders
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Key: NUTCH-589
URL: https://issues.apache.org/jira/browse/NUTCH-589
Project: Nutch
Issue Type: Improvement
Affects Versions: 0.9.0
Reporter: Ryan Levering
Priority: Minor
Currently the Nutch plugin classloader flattens all the jars from a plugins'
dependencies and instantiates a new classloader for each plugin. I think it
would be better to create a hierarchical classloader chain. Currently plugins
can't pass objects from a common plugin to one another because the objects are
created using different classloaders. Nutch currently avoids this by only
using interfaces from a common classloader to pass objects between plugins, but
I can't see the harm in improving the plugin classloader. It would require a
change to PluginDescription and PluginClassLoader in order to override
ClassLoader to maintain the export filter functionality that currently exists.
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